ice cubes facility to experiment cube ird · title : ice cubes facility to experiment cube ird :...

Reference : ICU-SA-RQ-004 Version : 1.5.0 Date : 27-Mar-2019

ICE Cubes Facility to Experiment Cube IRD

International Commercial

Experiments Service

Copyright by Space Applications Services – All Rights Reserved

ICE Cubes

Title : ICE Cubes Facility to Experiment Cube IRD

Abstract : This document provides a comprehensive interface definition between the ICE Cubes Facility (ICF) and the Experiment Cube to the ICE Cubes service customer (i.e. Experiment Cube development responsible).

This IRD is to be complemented by the guidelines ICU-SA-TN-011 [RD1] and the ICD template ICU-SA-ICD-002 [RD2].

All three documents are updated at regular intervals. Before proceeding, the reader shall ensure to be in possession of the latest versions by checking on our website: http://icecubesservice.com/

http://icecubesservice.com/

Reference : ICU-SA-RQ-004 Version : 1.5.0 Date : 27-Mar-2019 Page : 2



DOCUMENT APPROVAL SHEET

Responsibility Name and Position Company Signature and Date

Prepared by: ICE Cubes Team Space Applications Services

Checked by: T. Peignier

System Engineer

Space Applications Services

PA Checked by: L. Tazi

PA&S Engineer


Approved by: M. Ricci

Project Manager


Space Applications Services NV/SA

www.spaceapplications.com

Leuvensesteenweg 325 1932 Sint-Stevens-Woluwe

(Brussels Area), Belgium Tel: +32-(0)2-721.54.84

This document is the property of

Space Applications Services NV/SA.

All rights reserved.

http://www.spaceapplications.com/




DOCUMENT CHANGE RECORD

Version Date Author Changed Sections / Pages

Reason for Change / RID No

1.0.0 29-Jul-2016

ICE Cubes Team

Initial release

1.1.3 30-Jan-2017

ICE Cubes Team

All Draft release for PDR

1.2.0 16-Mar-2018

ICE Cubes Team

§1.3, §3.4.1, §3.5.1, §3.6.1, §3.6.3, §3.6.5, §3.6.7, §3.8.1, §3.8.10, Appendix A, Appendix C, Appendix D

Update of RDs; Electrical interface update; Addition of clarifications about communications between UHBs and Experiment Cubes, and about antivirus; Addition of §3.6.7; Deletion of §4.2.3.7 to §4.2.3.9; Addition of Appendix A and Appendix D; Update of Appendix C; Editorial corrections throughout the document

1.2.1 20-Apr-2018

ICE Cubes Team

§3.4.1, §3.5.1.3 Figure 13 minor update; Addition of capacitive coupling requirement

1.3.0 29-Aug-2018

ICE Cubes Team

§1.1, §1.2, §1.3, §2.1, §2.2, §2.3, §2.4, §3.1.1, §3.1.3, §3.1.7, §3.1.8, §3.2.1, §3.2.2, §3.2.3, §3.3.2, §3.3.4, §3.5.2, §3.5.3, §3.6.3, §3.6.4, §3.8.3, §3.8.7, §3.8.8, §3.9.2, §3.9.3, §4.2.1, Appendix A, Appendix C

Deletion of AD1; Addition/update of RDs; Update of figures; Addition of §2.3.1, §2.3.2, §2.4.1, §2.4.2; Addition of clarifications (e.g. notes); Update of requirements; Deletion of §3.6.3; Addition of §3.8.7 and §3.9.3; Update of Appendix A and Appendix C

All changes above are indicated by black bars in the page margins

Editorial corrections (not indicated by black bars) throughout the document

1.4.0 15-Feb-2019

ICE Cubes Team

§1.1, §1.3, §1.4, §2.1, §3.1.1, §3.1.2, §3.1.5, §3.1.7.1, §3.1.8, §3.2.1.1, §3.2.1.3, §3.2.3, §3.3.4, §3.4.1, §3.4.4, §3.4.5, §3.5.1.2, §3.5.1.3, §3.5.2, §3.5.2.3, §3.5.3, §3.5.5, §3.6.1, §3.6.3, §3.6.4, §3.6.5, §3.6.7, §3.7.4, §3.7.5, §3.8.11, §3.8.12, §3.9.2, §4.1, §4.2.2.1, §4.2.2.3, §4.2.2.4, §4.2.3.7, §4.3, §5, Appendix A, Appendix D

Addition of clarifications (e.g. notes); Deletion of RD3, RD7 and RD20; Addition of RDs; Addition of acronyms; Update of requirements and figures; Addition of §3.4.4, §3.4.5, §3.5.5, §3.6.7, §3.8.11 and §5; Merging of §3.5.2.6 with §3.5.2; Splitting of §3.5.3; Splitting of §3.6.4; Moving §4.2.2.5 to §4.2.3.7; Update of Appendix A and Appendix D

All changes above are indicated by black bars in the page margins

Editorial corrections (not indicated by black bars) throughout the document

1.4.1 20-Feb-2019

ICE Cubes Team

§3.6.4.5, §3.5.2.4, Appendix A

Addition of §3.6.4.5; Distance added in §3.5.2.4 (black bars in the page margin kept)




DOCUMENT CHANGE RECORD

Version Date Author Changed Sections / Pages

Reason for Change / RID No

1.5.0 27-Mar-2019

ICE Cubes Team

§1.4, §3.1.5, §3.1.9, §3.4.2, §3.4.3, §3.5.2.1, §3.5.2.2, §3.6.2, §3.6.4.3, §3.6.8, §3.9.2, §4, §4.1, Appendix A

Update of requirements; Addition of §3.1.9 and §3.6.8; Addition of references to FSDP and ICD in Appendix A; Editorial corrections

All changes are indicated by black bars in the page margins




Table of Contents 1 Introduction ............................................................................................................................... 10

1.1 Purpose and Scope ........................................................................................................ 10

1.2 Applicable Documents .................................................................................................... 10

1.3 Reference Documents .................................................................................................... 10

1.4 Acronyms ........................................................................................................................ 11

2 ICE Cubes Flight Segment Overview ...................................................................................... 14

2.1 The ICE Cubes Facility (ICF) ......................................................................................... 14

2.2 The Framework .............................................................................................................. 15

2.3 “Internal” Experiment Cubes .......................................................................................... 16

2.3.1 Experiment Cube Locations on the ICF ............................................................ 17

2.3.2 ICF Sliding Door ................................................................................................ 18

2.4 “External” Experiment Cubes & Other Payloads ............................................................ 19

2.4.1 ICF J21 Connector (DB13W3S) ........................................................................ 21

2.4.2 ICF J22 Connector (RJFTV71N) ....................................................................... 21

2.5 Thermal Cooling ............................................................................................................. 21

3 Experiment Cube Flight Interface Requirements ................................................................... 23

3.1 Mechanical Requirements .............................................................................................. 23

3.1.1 Experiment Cube Connector & Feet ................................................................. 23

3.1.2 Outer Surfaces & Protrusions ............................................................................ 24

3.1.3 Fins, Vents & Fans ............................................................................................ 24

3.1.4 Standard Form Factors ...................................................................................... 25

3.1.5 Dimensions ........................................................................................................ 25

3.1.6 Sharp Edges ...................................................................................................... 26

3.1.7 Audible Noise..................................................................................................... 26

3.1.7.1 Continuous Noise Limits .................................................................. 26

3.1.7.2 Intermittent Noise Limits .................................................................. 26

3.1.7.3 Audible Noise Limits Verification ..................................................... 26

3.1.8 Microgravity Disturbances ................................................................................. 26

3.1.9 Mass and Centre of Gravity (CoG) .................................................................... 27

3.2 Structural & Environmental Interface Requirements ...................................................... 27

3.2.1 Environmental Conditions .................................................................................. 27

3.2.1.1 Temperature, Pressure & Humidity Conditions ............................... 27

3.2.1.2 Depressurization/Re-Pressurization Conditions .............................. 28

3.2.1.3 Thermal Environment inside the ICE Cubes Facility ....................... 28

3.2.2 Launch & Landing Loads ................................................................................... 28




3.2.3 Random Vibration Loads ................................................................................... 29

3.2.4 Shock Loads ...................................................................................................... 29

3.3 Thermal Requirements ................................................................................................... 29

3.3.1 Temperature Control ......................................................................................... 29

3.3.2 Touch Temperature ........................................................................................... 29

3.3.3 Thermal Sensor ................................................................................................. 29

3.3.4 Condensation Prevention .................................................................................. 30

3.4 Electrical Interface Requirements .................................................................................. 30

3.4.1 DB13W3 Connector Proprietary Wiring ............................................................. 30

3.4.2 Power ................................................................................................................. 31

3.4.3 Unexpected Power Loss .................................................................................... 31

3.4.4 Power Circuit Protection & Inrush Current ........................................................ 31

3.4.5 Input Capacitor .................................................................................................. 32

3.5 Electrical & Electromagnetic Compatibility (EMC) Requirements .................................. 32

3.5.1 Grounding, Bonding & Isolation ......................................................................... 32

3.5.1.1 Grounding (i.e. Ground Return) ....................................................... 32

3.5.1.2 Bonding (i.e. Chassis Ground) ........................................................ 32

3.5.1.3 Isolation ........................................................................................... 33

3.5.2 Electromagnetic Interference (EMI) ................................................................... 33

3.5.2.1 E-Field Radiated Emissions ............................................................ 33

3.5.2.2 B-Field Radiated Emissions ............................................................ 34

3.5.2.3 Conducted Emissions ...................................................................... 35

3.5.2.4 Radiated Susceptibility / Immunity ................................................... 35

3.5.2.5 Conducted Susceptibility / Immunity................................................ 36

3.5.3 Electrostatic Discharge (ESD) Susceptibility / Immunity ................................... 38

3.5.3.1 ESD Susceptibility Tests ................................................................. 38

3.5.3.2 Caution Label (ESD Sensitive Cube) .............................................. 38

3.5.4 DC Magnetic Fields ........................................................................................... 38

3.5.5 Burn-In ............................................................................................................... 38

3.6 Data & Communication Interface Requirements ............................................................ 38

3.6.1 Experiment Cube IP Communication ................................................................ 39

3.6.2 Experiment Cubes Data Synchronisation Service............................................. 39

3.6.3 Experiment Cube Download of Data ................................................................. 40

3.6.4 Experiment Cube Software Security ................................................................. 40

3.6.4.1 Anti-Virus Protection ........................................................................ 40

3.6.4.2 Periodic Virus Signatures Definitions List Update ........................... 40




3.6.4.3 OS Hardening .................................................................................. 40

3.6.4.4 In-Orbit OS Update .......................................................................... 41

3.6.4.5 Encrypted Communications ............................................................. 41

3.6.5 Ethernet Interface .............................................................................................. 41

3.6.6 Intentional Transmitters & Receivers ................................................................ 41

3.6.7 GPS Time Synchronisation ............................................................................... 41

3.6.8 Data Rates ......................................................................................................... 41

3.7 Materials Requirements ................................................................................................. 42

3.7.1 Declared Materials List (DML) ........................................................................... 42

3.7.2 Forbidden Materials & Components .................................................................. 42

3.7.3 Surface Treatments & Protective Coatings ....................................................... 42

3.7.4 Flammability....................................................................................................... 42

3.7.5 Offgassing .......................................................................................................... 42

3.7.6 Fasteners Locking ............................................................................................. 42

3.8 Safety Requirements ...................................................................................................... 43

3.8.1 Collection of Safety-Related Data ..................................................................... 43

3.8.2 Non-Conformity with Requirements .................................................................. 43

3.8.3 Containment ...................................................................................................... 43

3.8.4 Volatile Organic Compound ............................................................................... 43

3.8.5 Glass or Frangible Materials Release ............................................................... 43

3.8.6 Lasers ................................................................................................................ 43

3.8.7 Light Sources ..................................................................................................... 43

3.8.8 Batteries & (Super-) Capacitors......................................................................... 43

3.8.9 Pyrotechnics ...................................................................................................... 44

3.8.10 Smoke & Fire Detection ..................................................................................... 44

3.8.11 Circuit Protection, Wire Sizing & Derating ......................................................... 44

3.8.12 Flight Readiness Certification ............................................................................ 44

3.9 Human Factor Interface Requirements .......................................................................... 44

3.9.1 Astronaut Interaction ......................................................................................... 44

3.9.2 Identification & Marking ..................................................................................... 44

3.9.3 Crew Safety ....................................................................................................... 45

3.10 Reliability Requirements ................................................................................................. 45

4 Experiment Cube Ground Interface Requirements ............................................................... 46

4.1 Hardware Interface ......................................................................................................... 46

4.2 Software Interface .......................................................................................................... 46

4.2.1 UHB to ICMCC Interface Overview ................................................................... 46




4.2.2 Mandatory Software Interface Requirements .................................................... 47

4.2.2.1 Software Host .................................................................................. 47

4.2.2.2 Connection to the ICMCC ................................................................ 47

4.2.2.3 Two-Factor Authentication ............................................................... 47

4.2.2.4 Security, Split Tunnelling ................................................................. 47

4.2.3 Optional Software Interface Requirements ....................................................... 47

4.2.3.1 Data Synchronisation Service Downlink .......................................... 48

4.2.3.2 Data Synchronisation Service Uplink .............................................. 48

4.2.3.3 Private IP Address ........................................................................... 48

4.2.3.4 Direct TCP & UDP Communication ................................................. 48

4.2.3.5 TCP & UDP Protocol ....................................................................... 48

4.2.3.6 UDP Connection .............................................................................. 48

4.2.3.7 UTC Time Synchronisation .............................................................. 48

4.3 Experiment Cube Unit-to-System Testing ...................................................................... 48

5 Experiment Cube to ICE Cubes Interface Test ....................................................................... 49

Appendix A Verification Matrix ........................................................................................................ 50

Appendix B Drawings ....................................................................................................................... 53

Appendix C Random Vibration Loads ............................................................................................. 54

Appendix D Typical Timeline and Required Documents ............................................................... 55

List of Figures Figure 1 ICE Cubes Facility closed and open views ............................................................................. 14

Figure 2 Framework features ................................................................................................................ 15

Figure 3 Framework with one 2Ux2U Experiment Cube ....................................................................... 16

Figure 4 1U Experiment Cube with protruding male DB13W3P connector and feet ............................ 16

Figure 5 J01 to J08 connectors positions on the bottom of the Framework ......................................... 17

Figure 6 J09 to J20 connectors positions on the top of the Framework ............................................... 17

Figure 7 ICF sliding door position relative to ICF connector J09 .......................................................... 18

Figure 8 ICF sliding door size (as seen from inside the ICF Container) ............................................... 19

Figure 9 Accommodation of wired external payload (concept) ............................................................. 20

Figure 10 Connectors on the front of the ICF ........................................................................................ 20

Figure 11 AUX LAN J22 connector on the front of the ICF Framework ................................................ 21

Figure 12 Schematics of the forced air cooling inside the ICF Container (top view) ............................ 22

Figure 13 Shell-dimpled DB13W3P male plug (Cube side) .................................................................. 23




Figure 14 Protrusions from the –Z Cube wall ........................................................................................ 23

Figure 15 Proper positioning of the DB13W3P connector on a 1U Cube (dimensions in mm) ............ 24

Figure 16 Experiment Cube standard form factors ............................................................................... 25

Figure 17 DB13W3S schematic (receptacle, Framework side) ............................................................ 30

Figure 18 DB13W3P schematic (plug, Cube side) ................................................................................ 30

Figure 19 DB13W3 pin assignment ....................................................................................................... 30

Figure 20 Trip curve (after the ramp time) ............................................................................................. 32

Figure 21 E-field radiated narrowband emission limits (RE02 test method) ......................................... 34

Figure 22 E-field radiated broadband emission limits (RE02 test method) ........................................... 34

Figure 23 AC magnetic radiated emission limits (RE01 test method) ................................................... 35

Figure 24 Radiated susceptibility E-field limit (RS03 test method) ....................................................... 36

Figure 25 Radiated susceptibility B-field limit (RS01 test method) ....................................................... 36

Figure 26 Limits for conducted susceptibility (sine wave) (CS01/CS02 test methods) ......................... 37

Figure 27 Transient pulse definition (CS06 test method) ...................................................................... 37

Figure 28 ICE Cubes communications (concept) .................................................................................. 46

List of Tables Table 1 Experiment Cubes standard external dimensions .................................................................... 25

Table 2 Continuous noise limits ............................................................................................................ 26

Table 3 Environmental conditions ......................................................................................................... 27

Table 4 Launch and landing load factors envelope ............................................................................... 28

Table 5 ICE Cubes Internet protocols ................................................................................................... 39

Table 6 LOS impact on communications between a UHB and its Experiment Cube............................ 47

Table 7 Cut-out dimensions for front and rear mounting methods for DB13W3P connector ................ 53

Table 8 Random vibration environment attenuated by 7.6mm of bubblewrap ...................................... 54

Table 9 Random vibration test profile enveloping Dragon and Cygnus ................................................ 54

Table 10 Experiment Cube project typical timeline ............................................................................... 55

Table 11 Documents to be produced by the customer ......................................................................... 55




1 Introduction

1.1 Purpose and Scope

This Interface Requirements Document (IRD) defines the requirements on external interfaces between the ICE Cubes Facility (ICF) and the Experiment Cube to be accommodated inside it when using the ICE Cubes service. In addition, this IRD provides requirements for design and testing of the Experiment Cube, and software interface requirements necessary for the customer to communicate from ground with his/her Experiment Cube in orbit.

The present document will be complemented by an addendum dealing with the specific requirements which are not detailed in this IRD. The Cube-specific addendum will be tailored (by the ICE Cubes service) based on the Experiment Cube characteristics (e.g. Cube containing batteries or laser).In addition, this IRD is accompanied by the guidelines ICU-SA-TN-011 [RD1] and ICD Template ICU-SA-ICD-002 [RD2].

All three documents are updated at regular intervals. Before proceeding, the reader shall ensure to be in possession of the latest versions by checking on our website: http://icecubesservice.com/

As the individual Experiment Cube is developed, appropriate sections of the IRD will serve as the basis for establishing a specific Experiment Cube Interface Control Document (ICD) to be agreed with the ICE Cubes service provider, i.e. Space Applications Services. The ICD (established from the ICD template [RD2]) shall take over precedence over the IRD for the Experiment Cube for which an ICD exists.

The sections on Experiment Cube requirements take into account the relevant documents listed in §1.3, and incorporate the technical requirements of the latter documents to the maximum extent compatible with the technical limitations of the ICF and the programmatic constraints of the ICF development programme.

1.2 Applicable Documents

The following document establishes requirements that are applicable to the Experiment Cubes.

AD1 deleted

1.3 Reference Documents

The following documents provide information useful in the design, development and verification of the Experiment Cube. The requirements directly applicable to the Experiment Cube have been already reported in this IRD, and as such the documents below do not need to be considered as applicable.

RD1 Space Applications Services – Guidelines for Experiment Cube Design and Development, ICU-SA-TN-011, latest version

RD2 Space Applications Services – Experiment Cube to ICE Cubes Service ICD Template, ICU-SA-ICD-002, latest version

RD3 Astrium – Columbus Pressurized Payloads Interface Requirements Document, COL-RIBRE-SPE-0164, Issue 2A, 15-Nov-2013 (+ relevant IRNs)

RD4 NASA – ISS Pressurized Volume Hardware Common Interface Requirements Document: International Space Station Program, SSP 50835, Rev. D, April 2013 (+ associated PIRNs)

RD5 SpaceX – C3-1 Dragon Interface Definition Document, SPX-00001047, Version 21, 14-Aug-2014

http://icecubesservice.com/




RD6 ESA – Security Requirements for LAN Connected Payloads, ESA-ISS-COL-SEC-RS-0002, Issue 1, 14-Oct-2014

RD7 ISO – General tolerances -- Part 1: Tolerances for linear and angular dimensions without individual tolerance indications, ISO 2768-1:1989, 02-Nov-1989

RD8 ISO – General tolerances -- Part 2: Geometrical tolerances for features without individual tolerance indications, ISO 2768-2:1989, 02-Nov-1989

RD9 ISO – Space systems -- Safety and compatibility of materials -- Part 1: Determination of upward flammability of materials, ISO 14624-1:2003, 01-Jun-2003

RD10 ISO – Space systems -- Safety and compatibility of materials -- Part 2: Determination of flammability of electrical-wire insulation and accessory materials, ISO 14624-2:2003, 01-Jun-2003

RD11 Underwriters Laboratories – Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, 6th edition, 28-Mar-2013

RD12 IETF – Network Time Protocol Version 4: Protocol and Algorithms Specification, RFC 5905, Jun-2010

RD13 IETF – Transmission Control Protocol, RFC 793, Sep-1981

RD14 IETF – User Datagram Protocol, RFC 768, 28-Aug-1980

RD15 ESA – Columbus EMC & Power Quality Requirements, COL-ESA-RQ-014, Issue 2 Rev. E, 10-Dec-2001

RD16 USDOD – Measurement of Electromagnetic Interference Characteristics, MIL-STD-462, 31-Jul-1967 (+ Notice 1, 1-Aug-1968, and Notice 2, 1-May-1970)

RD17 CENELEC – Electromagnetic compatibility of multimedia equipment - Emission requirements (CISPR 32:2015/COR1:2016), EN 55032:2015/AC:2016-07, Jul-2016

RD18 ECSS – Space product assurance: Derating - EEE components, ECSS-Q-ST-30-11C, Rev. 1, 4-Oct-2011

RD19 NASA – Protection of Payload Electrical Power Circuits, TA-92-038, 22-Feb-1993

RD20 Space Applications Services – Appendix A (Organisational and Logistics Aspects) to the Experiment Cube to ICE Cubes Interface Test Plan, ICU-SA-PL-019, latest version

RD21 Space Applications Services – Experiment Cube to ICE Cubes Interface Test Procedure, ICU-SA-PR-023, latest version

RD22 Space Applications Services – Note to the Customer for the Pre-Handover Preparations of an Experiment Cube, ICU-SA-TN-035, latest version

1.4 Acronyms

AD Applicable Document AOS Acquisition of Signal AWG American Wire Gauge CCSDS Consultative Committee for Space Data Systems CD Cube Detection




CENELEC European Committee for Electrotechnical Standardization CFDP CCSDS File Delivery Protocol CIS Center for Internet Security CIS-CAT CIS-Configuration Assessment Tool CoG Centre of Gravity COTS Commercial Off The Shelf CTB Cargo Transfer Bag DC Direct Current DDS Data Distribution Service DML Declared Materials List DPI Deep Packet Inspection ECSS European Cooperation for Space Standardization EDR European Drawer Rack EEE Electrical, Electronic and Electromechanical EMC Electromagnetic Compatibility EMI Electromagnetic Interference EPM European Physiology Module ESA European Space Agency ESD Electrostatic Discharge FSDP Flight Safety Data Package FSR Flight Safety Review FTP File Transfer Protocol GND Ground GPS Global Positioning System GRE Generic Routing Encapsulation HK Housekeeping H&S Health and Status HTTP Hypertext Transfer Protocol HTTPS HTTP Secure HTV H-II Transfer Vehicle ICD Interface Control Document ICE Cubes International Commercial Experiment Cubes ICF ICE Cubes Facility ICMCC ICE Cubes Mission Control Centre ICMP Internet Control Message Protocol IETF Internet Engineering Task Force IP Internet Protocol IRD Interface Requirements Document IRN Interface Revision Notice ISO International Organization for Standardization ISS International Space Station LAN Local Area Network LED Light-Emitting Diode LOS Loss of Signal MEVR Maximum Effective Vent Ratio N/A Not Applicable NASA National Aeronautics and Space Administration NLT Not Later Than NTP Network Time Protocol OS Operating System PDR Preliminary Design Review PIRN Preliminary Interface Revision Notice PKI Public Key Infrastructure RD Reference Document RDT Real Data Transport RFB Remote Framebuffer




RID Review Item Discrepancy RTCP RTP Control Protocol RTP Real-time Transport Protocol RTPS Real Time Publish Subscribe RTSP Real Time Streaming Protocol SFTP SSH File Transfer Protocol SCB Security Control Board SPL Sound Pressure Level SSD Solid State Drive SSH Secure Shell SSL Secure Sockets Layer TBC To Be Confirmed TBD To Be Determined TC Telecommand TCP Transmission Control Protocol TIM Technical Interchange Meeting TLS Transport Layer Security TM Telemetry U Unit (= 10 x 10 x 10 cm) UDP User Datagram Protocol UHB User Home Base USB Universal Serial Bus USDOD United States Department of Defense UTC Coordinated Universal Time VNC Virtual Network Computing VPN Virtual Private Network WAP Wireless Access Point WLAN Wireless Local Area Network XLS Microsoft Excel Spreadsheet File Format XML Extensible Markup Language XTCE XML Telemetric and Command Exchange




2 ICE Cubes Flight Segment Overview

This section provides an overview of the ICE Cubes Facility (ICF). Detailed information and interface requirements are provided in section 3 and section 4.

2.1 The ICE Cubes Facility (ICF)

The main characteristics in terms of physical conceptual configuration are briefly highlighted in the following.

The ICE Cubes Facility (ICF) is composed of:

• The Framework, accommodating up to 20 Experiment Cubes, and providing power and data/commands connectivity.

• The structural Container, to be installed and mechanically fastened inside the hosting rack (EPM) on board Columbus.

• Removable mass memory storage devices, namely the Solid State Drives (SSDs) and USB flash drives necessary to host the operational software and to physically download the scientific data.

The Experiment Cubes are standardized plug-and-play research modules (1U = 10cmx10cmx10cm) or modular combinations of that basic size.

Views of the ICF with the Framework and the Experiment Cubes are shown in Figure 1.

Figure 1 ICE Cubes Facility closed and open views

Unless otherwise specified, all dimensions pertaining to the ICF have standard tolerances, as specified in ISO 2768-1 [RD7] for linear and angular dimensions and in ISO 2768-2 [RD8] for features. The applicable tolerance classes are “m” and “K”, respectively.

ICF Container

Experiment Cubes (one 2U and two 1U shown)

Sliding door (within the

hinged door)

ICF Framework

Cooled air inlets (5x on each side of the Container)




2.2 The Framework

The Framework (Figure 2) is the central unit that accommodates each Experiment Cube and offers services such as power, connectivity and data storage.

It offers:

• Up to 20 active locations (power + gigabit Ethernet) for the accommodation and management of “internal” Experiment Cubes, each location is equipped with one DB13W3S female receptacle (J01 to J20, cf. Figure 5 and Figure 6).

• 1 active location (in the front), J21, for the accommodation/interfacing of an Experiment Cube located externally to the ICF and connected via a cable (cf. Figure 9)

• 1 Wireless Access Point (WAP) for the management of Experiment Cubes hosted in Columbus and connected via a private Wireless Local Area Network (WLAN) generated by the ICF.

• 2 USB 3.0 Type-A ports (in the front) used, e.g. for connecting USB flash drives

• 1 auxiliary LAN connector, J22 (RJ45 port)

The system, including the Experiment Cubes, is monitored and operated from ground.

Nominal interventions of the astronauts are limited to activation of power switch, exchange of Experiment Cubes and, if requested, installing/removing the SSD and USB flash drives used for collection of large amounts of scientific data to be physically downloaded to ground.

Figure 2 Framework features

DB13W3 receptacles to plug Experiment Cubes

DB13W3 receptacle J21 for one “external” Cube

Power switch

Air cooling slits

Hosting bay for two removable SSDs

Auxiliary LAN connector J22 (dust cap on)

LAN port to/from ground Two USB 3.0 slots (J23 & J24)

Sliding guides for accommodation in Container




2.3 “Internal” Experiment Cubes

The “internal” Experiment Cubes (hereafter referred to as “Experiment Cubes” or “Cubes”) can vary per experiment but will all have to meet basic interface requirements with the Framework such as modular size, weight, interface, maximum allowable power, etc.

The size of the Experiment Cubes is set to mimic the CubeSat standard, i.e. 10x10x10cm (1 litre) for a 1U Experiment Cube, 20x10x10cm for a 2U Experiment Cube, etc. with one principal difference: Experiment Cubes can be scaled along two axes in order to offer more flexibility to customers.

Figure 3 Framework with one 2Ux2U Experiment Cube

Figure 4 1U Experiment Cube with protruding male DB13W3P connector and feet




The Experiment Cubes can be functionally interconnected via the network offered by the Framework. The ICF housekeeping and the scientific data will be stored on a removable SSD and will be downlinked to ground according to the capabilities offered by the ISS infrastructure.

2.3.1 Experiment Cube Locations on the ICF

Different voltages (5V and/or 12V) and power profiles are available for each Experiment Cube location.

Figure 5 J01 to J08 connectors positions on the bottom of the Framework

Figure 6 J09 to J20 connectors positions on the top of the Framework




2.3.2 ICF Sliding Door

The Container door features a smaller sliding door (cf. Figure 1). This sliding door allows a limited access to possible special Cubes located on top of the J09 connector of the Framework. Indeed, a class of special Cubes may be able to host experiment cartridges (e.g. 20x40x80mm), which may require to be replaced more frequently than the Cubes and/or while the ICE Cubes Facility remains powered.

For making use of this sliding door, please contact the ICE Cubes service.

Figure 7 ICF sliding door position relative to ICF connector J09




Figure 8 ICF sliding door size (as seen from inside the ICF Container)

2.4 “External” Experiment Cubes & Other Payloads

The requirements in this IRD have mostly been defined for “internal” Experiment Cubes. Nevertheless, “external” Experiment Cubes or other payloads can be physically accommodated outside the ICF and connected to the ICF via:

• Wi-Fi • the front DB13W3S female receptacle (J21) of the Framework • the auxiliary LAN connector (J22) of the Framework • the USB 3.0 Type-A ports (J23 / J24) of the Framework.

For making use of any of these interfaces, please contact the ICE Cubes service.

The concept for the accommodation of wired external payloads is shown in Figure 9. The “external” Experiment Cube could for example be attached via a bogen arm to the seat track next to the ICF.




Figure 9 Accommodation of wired external payload (concept)

Figure 10 Connectors on the front of the ICF

“External” Experiment Cube (20x20x30cm shown)

LAN cable to/from Columbus

Seat track

“External” Experiment Cube to ICF J21 connection cable




2.4.1 ICF J21 Connector (DB13W3S)

The front DB13W3S receptacle (J21) of the Framework is almost identical in all aspects to the twenty other DB13W3S receptacles (J01 to J20) on the Framework, as defined in req. 3.1.1 and req. 3.4. The only difference is the fact that there is one #4-40UNC-threaded jackpost on each side of J21 (cf. Figure 10) to better secure a mated plug using two jackscrews.

2.4.2 ICF J22 Connector (RJFTV71N)

The AUX LAN connector (J22) provides a gigabit Ethernet interface to the ICF. The connector is an Amphenol RJFTV71N receptacle with key coding A (cf. Figure 11). The pin assignment follows the commonly used ANSI/TIA-568 standard. It can be interfaced using a typical RJ45 plug, which may (or not) be encased in an Amphenol RJFTV6MN or RJFTV6N shell.

Figure 11 AUX LAN J22 connector on the front of the ICF Framework

2.5 Thermal Cooling

The ICF thermal dissipation concept is based on forced air cooling provided by the hosting rack.

The warm air is sucked from two air outlets located on the rear panel of the Container, while the cold air enters from the ten inlets on the side walls of the Container.




Figure 12 Schematics of the forced air cooling inside the ICF Container (top view)




3 Experiment Cube Flight Interface Requirements

3.1 Mechanical Requirements

3.1.1 Experiment Cube Connector & Feet

Figure 13 Shell-dimpled DB13W3P male plug (Cube side)

The Experiment Cube shall feature at least four “feet”, roughly one at each of the four corners of the –Z face, protruding from the –Z face (cf. Figure 4). These protrusions (pf in Figure 14), as measured from the Cube –Z surface shall be ≥3.0 mm. These feet are needed to ensure that there will not be too much pressure on the DB13W3 connector(s) while being mated to the ICF Framework. The shape and exact locations of the feet onto the Cube shall be coordinated with the ICE Cubes service.

The Experiment Cube shall have at least one DB13W3P (male) connector, with shell dimples, protruding from the –Z face (cf. Figure 15). This protrusion (pc in Figure 14), as measured from the Cube –Z surface shall be such that pc - pf = 1.0mm (±0.2mm).

Other than the aforementioned connector(s) and feet, any protrusion from the Cube –Z surface (such as screw heads), measured as ps in Figure 14, shall be such that pf - ps ≥ 1.0mm.

When the Experiment Cube is mated to the ICF, no element from the Cube (other than the aforementioned connector(s) and feet) shall touch the ICF Framework. In particular, Cubes larger than 1U shall have a minimum clearance of 2mm (in all directions) around the other DB13W3S connectors (cf. Figure 5 and Figure 6), which protrude by 4.3mm from the Framework walls.

Figure 14 Protrusions from the –Z Cube wall

DB13W3P plug dimpled shell

pc

Cube wall

pc - pf =1.0mm

pf ≥ 3.0mm ps ps

Cube foot

protruding screw head (if any)




A mechanical interface drawing of the DB13W3P connector that is required for compatibility with the ICF is included in Appendix B.1.

For a 1U Experiment Cube, the positioning of the connector on the Cube shall comply with Figure 15.

For positioning of the connector(s) on larger Cubes and/or Cubes requiring more than one DB13W3P connector (cf. Figure 5 and Figure 6 for the positions of the various DB13W3S connectors on the Framework), please coordinate with the ICE Cubes service.

Figure 15 Proper positioning of the DB13W3P connector on a 1U Cube (dimensions in mm)

Note: In agreement with the ICE Cubes service, the coordinate system for the Experiment Cube may be different than the one pictured in Figure 15.

3.1.2 Outer Surfaces & Protrusions

No object or element shall protrude from the external walls of the Experiment Cube, with the following exceptions:

• the aforementioned connector(s) and feet (see req. 3.1.1),

• heads of eventual screws fastening the aforementioned connector (cf. Figure 14),

• heads of eventual screws fastening the Experiment Cube walls (see also req. 3.1.6),

• eventual fins (see req. 3.1.3).

Note: Cubes requiring a different setup need prior approval from the ICE Cubes service.

3.1.3 Fins, Vents & Fans

For Experiment Cubes requiring objects or elements which have the potential to significantly alter the direction and/or speed of the forced air flow around the Experiment Cube (e.g. fins, vents and/or fans), please coordinate with the ICE Cubes service for more information and approval.




3.1.4 Standard Form Factors

The Experiment Cube can range in size from 1U to 4Ux3U, as illustrated in Figure 16.

Figure 16 Experiment Cube standard form factors

3.1.5 Dimensions

The Experiment Cube shall have external dimensions as per one of the lines in Table 1.

Table 1 Experiment Cubes standard external dimensions

Cube Form Factor Cube External Dimensions* (±4mm)

1U 100mm x 100mm x 100mm

1.5U 162.5mm x 100mm x 100mm

2U 225mm x 100mm x 100mm

3U 350mm x 100mm x 100mm

4U 475mm x 100mm x 100mm

2U x 1.5U 225mm x 162.5mm x 100mm

2U x 2U 225mm x 225mm x 100mm

3U x 2U 350mm x 225mm x 100mm

3U x 3U 350mm x 350mm x 100mm

4U x 2U 475mm x 225mm x 100mm

4U x 3U 475mm x 350mm x 100mm * excluding small protrusions from the Cube external walls such as connector(s), feet and screw heads (cf. req. 3.1.2

Note: Cubes requiring different dimensions need prior approval from the ICE Cubes service.

The external dimensions of the Experiment Cube (and ancillary flight items, if any) shall be established with ±5% accuracy.

The overall height of the Cube (i.e. dimension along the Z axis per Figure 15), as measured between the DB13W3 connector(s) and any protrusion (as defined in req. 3.1.2) on the +Z face, shall be <116mm.

3Ux2U 2Ux2U

4Ux2U

4Ux3U 2U

4U 3U 1.5U 1U

2Ux1.5U

3Ux3U




3.1.6 Sharp Edges

To prevent inadvertent injury to the astronauts, the external surfaces of the Experiment Cube shall not have sharp edges, sharp corners and/or sharp protrusions.

The sharp edges verification shall make use of a cotton glove that should not be snagged as it passes over all of the Cube surfaces (including the protruding connector, etc. per req. 3.1.2).

3.1.7 Audible Noise

3.1.7.1 Continuous Noise Limits

The total unweighted Sound Pressure Level (SPL) generated by the Experiment Cube in the noisiest functioning conditions shall be measured at a fixed distance from the noisiest Cube surface in all octave bands between 63Hz and 8000Hz (i.e. 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz and 8kHz). This distance is 60cm for an “external” Cube, and can vary from 64cm to 102cm for an “internal” Cube, to be coordinated with the ICE Cubes service.

For continuous noise (i.e. more than 8 hours per 24-hour period), the limit levels defined in Table 2 shall not be exceeded in any octave band.

Table 2 Continuous noise limits

Frequency 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz

Limit (“internal”, TBC) 60dBL 50dBL 39dBL 35dBL 34dBL 32dBL 33dBL 35dBL

Limit (“external”, TBC) 64dBL 56dBL 50dBL 45dBL 41dBL 39dBL 38dBL 37dBL

Note: If the noise generated by the Experiment Cube is lower than 31dBA (A-weighted dB) when measured at 64cm (60cm for an “external” Cube) from the noisiest Cube surface in the noisiest functioning conditions, the above-specified measurement is in principle not required. Please contact the ICE Cubes service for details.

3.1.7.2 Intermittent Noise Limits

In case of intermittent noise generated by the Experiment Cube, i.e. less than 8 hours per 24-hour period, the acceptable noise limits can be higher than the values defined in Table 2 and they shall be agreed with the ICE Cubes service.

3.1.7.3 Audible Noise Limits Verification

The requirements of audible noise produced by the Experiment Cube can be verified by:

• Analysis based on the datasheets of the commercial parts, if available, and/or • Test

The test setup and procedure (including success criteria) shall be agreed between the ICE Cubes service and the customer.

3.1.8 Microgravity Disturbances

Microgravity disturbances generated by the Experiment Cube at the level of the mechanical interface with the ICF shall be limited.




Based on preliminary indications from §3.1.2 of SSP 50835 [RD4], the Experiment Cube shall not generate vibratory accelerations:

• ≥ 0.001 µg in the frequency range 0.01 < f ≤ 0.1 Hz, and • ≥ 0.01 x f µg in the frequency range 0.1 < f ≤ 100 Hz, and • ≥ 1 µg for frequencies f ≥ 100 Hz.

The test setup and procedure (including success criteria) shall be agreed between the ICE Cubes service and the customer.

Note: This requirement is mostly relevant for Cubes containing moving parts (pumps, fans, motors, valves), which are prone to generating perceptible vibrations, including acoustic vibrations.

3.1.9 Mass and Centre of Gravity (CoG)

The mass (launch configuration) and CoG (in-orbit configuration) of the Experiment Cube (and ancillary flight items, if any) shall be established with accuracies of ±5% and ±10%, respectively.

Note: The typical Experiment Cube coordinate system is pictured in Figure 15.

3.2 Structural & Environmental Interface Requirements

3.2.1 Environmental Conditions

3.2.1.1 Temperature, Pressure & Humidity Conditions

To guarantee mission success (reliability-related, see req. 3.10), the Experiment Cube shall be able to withstand the ISS, HTV, Progress, Soyuz, Dragon, and Cygnus humidity, temperature and atmospheric pressure requirements as summarized here below (from COL-RIBRE-SPE-0164 [RD3] and SSP 50835 [RD4]).

Table 3 Environmental conditions

Temperature (°C) Pressure (mbar) Maximum Relative Humidity (%)

Storage +5 to +46 896 to 1103 85

Transport 0 to +50* 896 to 1103 90

Accommodation into launcher

0 to +50 600 to 1293 85

Launch / Ascent 0 to +50** 0 to 1293 90 (100 depressed)

On Orbit (on board the ISS) non operational

+5 to +45 0 to 1048 70 (100 depressed)

Descent / Landing 0 to +40** 0 to 1293 90 (100 depressed)

After Landing in Soyuz -50 to +50 atmospheric 98 * In the event of a winter launch in Progress or Soyuz, the temperature range requirement during transportation by train to the launch site is actually -50°C to +50°C. However, this temperature range can be narrowed to 0°C to +50°C by shipping the hardware items to the launch site in such a way that no transportation in an uncontrolled temperature environment takes place (as it has been done in the past for other projects). Therefore, it is considered appropriate to verify compliance of the Experiment Cube design against the 0°C to +50°C range. ** In the event of a launch and/or return in Dragon, the temperature ranges can be narrowed to +18.3°C to +30°C.




For Experiment Cubes with special temperature and/or humidity control requirements (on board, during launch, and/or return to ground), please coordinate with the ICE Cubes service as early as possible.

3.2.1.2 Depressurization/Re-Pressurization Conditions

The Experiment Cube shall be compatible with the following:

• The maximum depressurization/re-pressurization rates during transport (ascent/descent) of 13.3 kPa/s and 798 Pa/s, respectively.

• The depressurization/re-pressurization rates on board the ISS of 878 Pa/s (for at least 2 min, starting at ambient pressure), and 230 Pa/s (for at least 3 min, starting at p = 100 Pa).

• The pressure gradient that may occur due to fire suppression in the rack where the ICF is hosted, with a peak pressurization rate of 20 kPa/s (for less than 0.1 second in the case of manual fire suppression).

Note: To guarantee that no significant mechanical stress is applied on enclosed (not intentionally sealed) structures during depressurization or re-pressurization, vents in each enclosure should be implemented such that the Maximum Effective Vent Ratio (MEVR) = internal volume (cm³) / effective vent area (cm²) ≤ 5080 cm. Enclosures verifying this criterion do not require any depressurization/re-pressurization test nor structural analysis.

3.2.1.3 Thermal Environment inside the ICE Cubes Facility

The cooling of the Experiment Cube is obtained via forced air ventilation inside the ICF.

The temperature of the cooled air flow entering the ICF Container can range between 17°C and 30°C (hosting rack design values). Measurements performed in the past range between 20°C and 25°C.

Approximate temperature of the air surrounding the Experiment Cube, if requested, can be offered by proper location of the Cube itself in the ICF.

If needed for mission success (reliability-related, see req. 3.10), fine temperature control shall be implemented by the customer at Cube level, e.g. by introducing heaters, fins, vents, fans (see req. 3.1.3) or Peltier coolers, as necessary.

3.2.2 Launch & Landing Loads

The Experiment Cube safety-critical and interface-critical structures shall provide positive margins of safety when exposed to the accelerations documented in Table 4 at the centre of gravity of the Cube soft stowed in bags (soft packaging in principle provided by the ICE Cubes service), with all six degrees of freedom acting simultaneously.

Table 4 Launch and landing load factors envelope

Nx (g) Ny (g) Nz (g) Rx (rad/s²) Ry (rad/s²) Rz (rad/s²)

Launch +/-7.4 +/-7.4 +/-7.4 +/-13.5 +/-13.5 +/-13.5

Landing +/-10.0 +/-10.0 +/-10.0 N/A N/A N/A

Safety-critical and interface-critical structures within an Experiment Cube will be identified by the ICE Cubes service, based on the peculiarities of the Experiment Cube.




3.2.3 Random Vibration Loads

The Experiment Cube safety-critical and interface-critical structures packed soft stowed in bags (soft packaging in principle provided by ICE Cubes service) shall meet the specified performance requirements when exposed to the maximum flight random vibration environments defined in Appendix C (from Table 3.1.1.2.1.2.3.1-1 of SSP 50835 [RD4]).

Safety-critical and interface-critical structures within an Experiment Cube will be identified by the ICE Cubes service, based on the peculiarities of the Experiment Cube.

For reliability purposes (see req. 3.10), Experiment Cubes are strongly advised to be random vibration tested regardless of the criticality of their structures.

For Experiment Cubes not launched soft stowed and/or for establishing the proper vibration test for your Cube, please coordinate with the ICE Cubes service.

3.2.4 Shock Loads

The Experiment Cube packed in bubblewrap or foam will not experience significant mechanical shock. Shock verification is not required for launch and return events.

Any mechanical or electrical components that are highly sensitive to shock should be assessed on a case-by-case basis with the help of the ICE Cubes service.

3.3 Thermal Requirements

3.3.1 Temperature Control

For Experiment Cubes with special temperature control requirements (on board, during launch, and/or return to ground), please coordinate with the ICE Cubes service as early as possible.

3.3.2 Touch Temperature

Under all modes of operation, the Experiment Cube shall have no external surface exceeding the required permissible material temperature TPM for intentional contact (any length of time). TPM depends on the surface material characteristics and can be calculated as follows:

TPM = 17570 / I + 44.87 (expressed directly in °C).

I = (kρc)½ is the thermal inertia [J·m-2·K-1·s-½], where k is the thermal conductivity [W·m-1·K-1], ρ the density [kg·m-3] and c the specific heat [J·kg-1·K-1].

TPM for commonly used materials is equal to: 45.8°C for aluminium alloy AA6061-T6; 47.3°C for stainless steel AISI 316; 57.0°C for glass; 69.0°C for Teflon.

3.3.3 Thermal Sensor

Although in principle not needed, the implementation of thermal sensor(s) in the Experiment Cube may be requested by the ICE Cubes service on a case-by-case basis.




3.3.4 Condensation Prevention

Under all modes of operation, no condensation shall occur in the internal parts or on the external surface of the Experiment Cube.

Note: This requirement is in principle automatically verified for all Experiment Cubes not requiring refrigerated or frozen upload and without active cooling system (e.g. Peltier cooler) that could reach a temperature ≤15°C.

3.4 Electrical Interface Requirements

3.4.1 DB13W3 Connector Proprietary Wiring

The Experiment Cube shall comply with the following proprietary pin assignment.

Figure 17 DB13W3S schematic (receptacle, Framework side)

Figure 18 DB13W3P schematic (plug, Cube side)

A1 A2 A3 1 2 3 4 5 6 7 8 9 10 +12V GND +5V B+/R+ B-/R- C+ C- CD A+/T+ A-/T- D+ D- SHLD

(A to D = bidirectional gigabit Ethernet data pairs, T = Transmit, R = Receive; GND = Ground; CD = Cube Detection; SHLD = Ethernet cable shield)

Figure 19 DB13W3 pin assignment

The Cube Detection circuit enables to detect the presence of a recognized plugged Cube. As such, pin 5 shall be properly terminated in the Experiment Cube, as follows:

• Unless otherwise specified: electrical resistance = 0 Ω (short to ground). • For specific cases (e.g. non-IP-enabled Cubes): resistance value between 12 kΩ and 220 kΩ

to be assigned by the ICE Cubes service.

In case 5V power is not required, the unused pin A3 shall be left unconnected in the Experiment Cube (isolation resistance to all other pins >10MΩ).

In case 12V power is not required, the unused pin A1 shall be left unconnected in the Experiment Cube (isolation resistance to all other pins >10MΩ).

Ethernet pins (pins 1 to 4 and 6 to 9) are not required to be populated in the Cube connector when not used by the Cube.




3.4.2 Power

For both the +5V and +12V lines, the Experiment Cube’s power budget (nominal and maximum uses), and heat-dissipation budget if different, shall be established for each operational case with an accuracy of ±2W.

The Experiment Cube can make use of two different power lines: 5V @ 0.9A (thus 4.5W maximum) and 12V @ 3A (thus 36W maximum) per DB13W3 connector.

The maximum amount of power delivered to the Experiment Cube depends on its capability to dissipate heat through its external surfaces (e.g. on its geometry).

For preliminary design purposes, the following maximum (peak) power consumptions shall be considered: 10W for 1U, 15W for 1.5U, 20W for 2U, 30W for 3U and 40.5W for 4U and bigger sizes (see req. 3.1.5).

For Experiment Cubes with higher power requirements, please coordinate with the ICE Cubes service.

3.4.3 Unexpected Power Loss

The Experiment Cube shall be able to safely withstand unexpected power loss and multiple power cycles, resulting from normal operations on board the ISS.

Note: This requirement is only related to possible hazards (i.e. safety-related) that could occur in case of power loss or multiple power cycles. Any reliability aspect remains the customer’s responsibility (see req. 3.10).

After a loss of power (not linked to Cube tripping, cf. req. 3.4.4), the re-powering of the Cube will be done automatically upon ICF reboot (unless otherwise requested by the customer).

3.4.4 Power Circuit Protection & Inrush Current

The Experiment Cube electrical interface shall be designed to be compatible with the following power interface characteristics.

The ICF power circuit protection on the 5V and 12V lines consists of resettable electronic fuses (one per power line for each DB13W3 connector, i.e. forty-two independent fuses).

The ICF electronics also features an active current limiter to control the inrush current to the Cubes and to help eliminate conductive and radiative interferences. The output voltage slew rate is ~1.2V/ms for both 5V and 12V lines, which gives total ramp times of ~4ms (5V line) and ~10ms (12V line).

As such, unless there is a short-circuit in the Cube or if the Cube equivalent load resistance is too low (i.e. <5.5Ω for the [email protected] line and <4Ω for the [email protected] line), this current limiter will ensure that the Cube does not trip upon start-up.

Passed the ramp time, the circuit is protected and will trip within 0.2µs if the current is > IFASTRIP and within 4ms if the current > ILIM (cf. Figure 20).

For the 5V line, INOMINAL ≤ 0.9A; ILIM = 1.02A to 1.07A depending on the Experiment Cube location (e.g. 1.035A on J21); IFASTRIP = 2.00A.

For the 12V line, INOMINAL ≤ 3.0A; ILIM = 3.16A to 3.25A (e.g. 3.168A on J21); IFASTRIP = 5.32A.




Figure 20 Trip curve (after the ramp time)

In case of a short-circuit in the Cube, the trip will occur within 4ms for the 5V line and within 0.8ms for the 12V line.

Note: Additionally, since the ICF monitors the Cube’s current, some thresholds can also be included in the ICF software that would automatically send a warning and/or shut off the Cube in case a certain condition is met (e.g. >0.5A for more than 60 seconds continuously).

3.4.5 Input Capacitor

To ensure that the Cube does not trip during the first 10ms (see req. 3.4.4), the input capacitor on a Cube shall not exceed 400µF on the 5V line and 750µF on the 12V line.

Note: Theoretically, these input capacitor values can be larger if the Cube load is well below ILIM. For Experiment Cubes with larger input capacitor, please coordinate with the ICE Cubes service.

3.5 Electrical & Electromagnetic Compatibility (EMC) Requirements

3.5.1 Grounding, Bonding & Isolation

3.5.1.1 Grounding (i.e. Ground Return)

The grounding (i.e. input power ground return) of the Cube shall be exclusively implemented via pin A2 (GND) in the Cube DB13W3P connector.

3.5.1.2 Bonding (i.e. Chassis Ground)

There shall be no floating metal within the Experiment Cube, i.e. all substantial metallic part shall be bonded.

Preferred bonding strategy: the Experiment Cube shall be bonded to the ICF via the metallic frame of the DB13W3 interface connector (there is no bonding strap between the Experiment Cubes and the ICF).

The Experiment Cube shall have a bonding resistance ≤ 2.5 mΩ DC per bonding junction between:

• different parts of the Cube metallic structure, • DB13W3P connector shell and Cube metallic structure,

ILIM

IFASTRIP

INOMINAL

current

0.2µs 4ms time




• internal bonding straps, if any, and Cube metallic structure.

To avoid floating metal on a secondary power circuit isolated from the ground return (e.g. in case an isolating DC/DC converter is used), the secondary power ground return shall be connected to the DB13W3P shell with a bonding resistance ≤ 2.5 mΩ DC.

Preferred bonding strategy for the shield: the Experiment Cube shall have a bonding resistance between cable shield termination (Cube DB13W3P connector pin 10) and DB13W3P shell ≤ 7 mΩ DC.

Optional bonding strategy: the Cube metallic structure may be used as power ground return (e.g. multipoint ground) and thus isolated from the DB13W3P shell (see req. 3.5.1.3). In such a case, the Experiment Cube’s feet (see req. 3.1.1) shall not be electrically conductive and the Experiment Cube shall have a bonding resistance ≤ 2.5 mΩ DC per bonding junction between:

• different parts of the Cube metallic structure, • internal bonding straps, if any, and Cube metallic structure.

Optional bonding strategy for the shield: the Experiment Cube cable shield termination (Cube DB13W3P connector pin 10) shall be connected to the power ground return (pin A2) with a 10MΩ to 40MΩ resistor.

3.5.1.3 Isolation

The isolation resistance between the Cube DB13W3P connector shell and pins 1, 2, 3, 4, 6, 7, 8, 9 of the DB13W3P connector shall be > 10MΩ.

The isolation resistance between the Cube DB13W3P connector shell and pins A1, A2 and A3 of the DB13W3P connector shall be > 10MΩ.

The capacitive coupling between the Cube DB13W3P connector shell and pins A1, A2 and A3 of the DB13W3P connector shall be < 220nF.

3.5.2 Electromagnetic Interference (EMI)

The verifications below can be performed through analysis (e.g. relying on COTS datasheets) or testing. In the latter case, the test setup and procedure (including success criteria) shall be agreed between the ICE Cubes service and the customer.

3.5.2.1 E-Field Radiated Emissions

Under all modes of operation, electric field emissions measured at 1m from the Experiment Cube shall not exceed the limits of Figure 21 in the frequency range 14 kHz to 10 GHz and of Figure 22 in the frequency range 14 kHz to 1GHz. The test method is RE02 of MIL-STD-462 [RD16]. Above 30MHz, the emissions shall be measured both in vertical and in horizontal polarization. Below 30MHz, the measurement shall be done in vertical polarization only.

Additionally, the following limits shall not be exceeded in the following frequency notches:

• 55 dBµV/m (narrowband) from 2.2 to 2.4 GHz • 82dBμV/m/MHz (broadband) from 442 to 455 MHz

Note: For the notching portion of the test, an aluminium foil may be wrapped around an “internal” Cube to simulate the shielding (Faraday cage) that constitutes the surrounding ICF Container in orbit.




Figure 21 E-field radiated narrowband emission limits (RE02 test method)

Figure 22 E-field radiated broadband emission limits (RE02 test method)

For the broadband measurements, the used measurement bandwidth shall be 10 times larger than the measurement bandwidth used for the narrowband measurements. If the measured emission levels do not increase by more than 10dB, the measured interferences can be considered as narrowband. The broadband level is not applicable to narrowband interference signals.

Note: If the narrowband measurements show that there is only narrowband noise, the broadband measurements can be omitted.

3.5.2.2 B-Field Radiated Emissions

Under all modes of operation, AC magnetic field emissions measured at 7cm from the Experiment Cube (all six sides) shall not exceed the limits of Figure 23 in the frequency range 30 Hz to 250 kHz. The test method is RE01 of MIL-STD-462 [RD16].




Figure 23 AC magnetic radiated emission limits (RE01 test method)

Note: For Experiment Cubes with no electrical/electronic system generating B-field radiated emissions, the test may be replaced by an assessment.

3.5.2.3 Conducted Emissions

Under all modes of operation, conducted emissions from the Experiment Cube power line(s) shall not exceed the limits per:

• §4.1.5.1 and §4.1.5.2 of COL-ESA-RQ-014i [RD15] (CE01/CE03 test methods of MIL-STD-462 [RD16]), or

• CISPR32 / EN 55032 [RD17], or • equivalent specification

The limit and test method will depend on the Experiment Cube characteristics and shall be agreed between the ICE Cubes service and the customer.

Note: For Experiment Cubes with adequate filtering on the +5V/+12V power/return lines, or whose electronic/electrical systems connected to the power/return lines are already “certified” (e.g. have already the EN 55032 certification, or been used inside the ISS), the test may be replaced by an assessment.

3.5.2.4 Radiated Susceptibility / Immunity

Since the Experiment Cube’s susceptibility (or immunity) is a reliability issue under the customer’s responsibility (see req. 3.10), susceptibility testing is not mandatory. The radiated susceptibility tests typically performed for payloads on board Columbus are:

• E-field irradiations as defined in Figure 24 up to 10 GHz (method RS03 of MIL-STD-462 [RD16])

i The ICE Cubes service will provide the related information in case this method of verification is selected by the customer




Figure 24 Radiated susceptibility E-field limit (RS03 test method)

• B-field irradiations as defined in Figure 25 from 30Hz to 250kHz (method RS01 of MIL-STD-462 [RD16], at a distance of 5cm)

Figure 25 Radiated susceptibility B-field limit (RS01 test method)

3.5.2.5 Conducted Susceptibility / Immunity

The +12V and +5V power inputs to the Experiment Cube are perfectly regulated, so conducted susceptibility (or immunity) is in principle not an issue. For reliability purposes, under the customer’s responsibility (see req. 3.10), the conducted susceptibility tests typically performed for payloads on board Columbus are:

• Sine wave injection on DC power lines with amplitudes as defined in Figure 26 from 30 Hz to 50 MHz (methods CS01/CS02 of MIL-STD-462 [RD16])




Figure 26 Limits for conducted susceptibility (sine wave) (CS01/CS02 test methods)

• Transient injection on DC power input leads with spikes having the waveform and the amplitude of twice the supply voltage shown in Figure 27 for a period of not less than 1 minute at each phase position, and for a total test period not exceeding 15 minutes in duration (method CS06 of MIL-STD-462 [RD16])

o Spike #1: E=twice the nominal line voltage; t=10μs ±20% o Spike #2: E=twice the nominal line voltage; t=0.15μs ±20%

Figure 27 Transient pulse definition (CS06 test method)




3.5.3 Electrostatic Discharge (ESD) Susceptibility / Immunity

3.5.3.1 ESD Susceptibility Tests

Since the Experiment Cube’s susceptibility (or immunity) is a reliability issue under the customer’s responsibility (see req. 3.10), arc discharge testing is not mandatory. The ESD susceptibility tests typically performed for payloads on board Columbus consist in exposing the equipment and its interface lines to a repetitive electrostatic discharge of at least 5.6mJ energy/15kV. The test must be performed with conducted and radiated ESD sources. If any damage risk is envisaged for the Experiment Cube interface circuitry, the voltage of the conducted test can be reduced down to ≥4kV, without changing the energy value.

Note: These voltages are the result of charges that may be accumulated and discharged from ground personnel or astronauts during equipment installation or removal.

3.5.3.2 Caution Label (ESD Sensitive Cube)

If a damage risk to the Experiment Cube by ESD between 4 and 15 kV is envisaged, the customer shall notify the ICE Cubes service, so that a dedicated label (see req. §3.9.2) is affixed on the Experiment Cube external surface.

Notes: Regardless of the presence of the caution label on the Cube, the bubblewrap ziplock used as cushioning launch bag for the Cube is an antistatic bag, and astronauts wear an antistatic wrist strap when mating/demating a Cube to/from the ICF.

3.5.4 DC Magnetic Fields

For Experiment Cubes featuring electromagnetic and/or permanent magnetic devices, the generated DC magnetic fields shall not exceed 170 dB picotesla (= 316 µT) at a distance of 7 cm from the external surfaces of the Cube.

3.5.5 Burn-In

It is advised, for reliability purposes (see req. 3.10), to perform a burn-in of the Cube’s EEE parts and components. For guidance and recommendations, please contact the ICE Cubes service.

3.6 Data & Communication Interface Requirements

The ICF offers a number of communication interfaces to operate the Experiment Cubes. The use of each of the communication interface is optional and depends of the needs of the specific Cube.

The communication interfaces include:

• IP communication • Data synchronisation • Download of data

Each of those interfaces are described in the following sections.




3.6.1 Experiment Cube IP Communication

Multiple User Home Bases (UHBs) may be defined for interacting with an Experiment Cube, however only one at a time will be able to operate the Cube in question. In particular, the Cube to UHB direct communication stream needs to be configured at ICE Cubes Mission Control Centre (ICMCC) level.

Note: Each UHB needs to fulfil the security requirements described in req. 4.2.2.3 and req. 4.2.2.4.

For communicating with a specific Experiment Cube, the UHB(s) shall make use of the private IP address assigned by the ICMCC to the Experiment Cube.

An Experiment Cube using IP communications shall answer the incoming ICMP requests (ping) in order to assess the connectivity status of the Experiment Cube.

For initiating outgoing connections, from the Experiment Cube to the ground, a ground IP address will be assigned by the ICMCC to the related UHB. The Experiment Cube shall use this address to establish direct IP communication to this specific UHB.

The Experiment Cube requiring direct control from ground using Internet protocols may for example implement an SSH server.

Table 5 ICE Cubes Internet protocols

Internet Layer Transport Layer Application Layer ICMP IPv4 TCP HTTP

HTTPS/SSL Opus RDP SSH SFTP, SSH SSL/TLS VNC/Remote Desktop, RFB mobiNET (proprietary) VP8/HTTP Other (to be agreed)

IPv4 UDP CFDP, CCSDS Stack DDS, RTPS RTP, RTCP RTSP Other (to be agreed)

IP GRE GRE

Data communication to and from the Experiment Cube will only be allowed using the Internet protocols listed in Table 5. The utilization of other protocols shall be coordinated with the ICE Cubes service.

3.6.2 Experiment Cubes Data Synchronisation Service

As a result of normal operations on board the ISS, the Experiment Cube will experience periods of Acquisition of Signal (AOS), during which near real-time communications are possible, and of Loss of Signal (LOS), during which no data can be transferred to/from Earth.

During AOS periods, the Experiment Cube science data can be directly downlinked to Earth using near real-time IP-based communication. However, this communication will stop during periods of LOS and may result in a loss of data.




Alternatively, the Experiment Cube can make use of the data synchronisation service provided by the ICE Cubes service. The Cube data will be automatically downlinked to ground or uplinked to the ICF (see req. 4.2.3.1 and 4.2.3.2) whenever possible.

To use the data synchronisation service, the Experiment Cube shall have an SFTP client installed.

The space reserved to each Experiment Cube for temporary storage of data on the ICF data storage media shall be defined and agreed with the customer based on the specific need of the Experiment Cube.

Note: The data will not be purged by the ICE Cubes service as long as the Experiment Cube is in orbit. This is a responsibility of the customer.

3.6.3 Experiment Cube Download of Data

For Experiment Cubes requiring the physical download of their data, a flight-worthy USB flash drive (Type-A plug) of sufficient size shall be provided by the customer. The USB flash drive shall be compatible with the USB 3.0 slots J23 and J24 of the Framework (cf. Figure 2). The USB flash drive shall be interface tested (cf. §5).

3.6.4 Experiment Cube Software Security

3.6.4.1 Anti-Virus Protection

Experiment Cubes (whose architecture support antimalware) using the IP services for data transmission shall have and use antivirus protection. The Cube’s antivirus protection shall be demonstrated during the Interface Test (cf. §5).

During the operation phase on orbit, antivirus scans of the Cube system shall be performed on a weekly basis. Scan reports shall be communicated to the ICE Cubes service.

3.6.4.2 Periodic Virus Signatures Definitions List Update

The virus signature definitions list of the Experiment Cube shall be updated by the customer quarterlyii, i.e. during Cube in-orbit commissioning (if the last update took place more than 3 months before the commissioning), and then every 3 months or less.

A virus signature definitions list update shall be performed/demonstrated on the Cube during the Interface Test (cf. §5).

3.6.4.3 OS Hardening

For OS-based Experiment Cubes, information about the OS shall be provided by the customer to the ICE Cubes service.

Unless otherwise agreed with the ICE Cubes service, the OS hardening shall be done following the CIS-CAT recommendations level 1iii.

ii Periodicity defined in OB_SEC_0005 of ESA-ISS-COL-SEC-RS-0002 [RD6]

iii See https://www.cisecurity.org/cis-benchmarks/cis-benchmarks-faq/

https://www.cisecurity.org/cis-benchmarks/cis-benchmarks-faq/




3.6.4.4 In-Orbit OS Update

For OS-based Experiment Cubes, any in-orbit update of the OS shall be agreed with the ICE Cubes service. A security scan of the updated OS (deployed on a ground hardware representative of the Cube in orbit) shall be performed by the ICE Cubes service before the OS is updated in orbit.

3.6.4.5 Encrypted Communications

For security audits and Deep Packet Inspection (DPI), the ESA Security Control Board (SCB) may require at any moment the TLS certificate(s) used for the encrypted communications of the Cube (e.g. SSH communication). Upon such request, the customer shall provide the aforementioned TLS certificate(s).

Note: Should the customer want/need to further encrypt the data generated by the Cube (e.g. for confidentiality or intellectual property reasons), this further encryption does not need to be shared with anyone.

3.6.5 Ethernet Interface

IP-enabled Experiment Cubes shall be compatible with Ethernet (10/100/1000base-T auto-negotiation supported), with pin assignment as per requirement 3.4.1.

3.6.6 Intentional Transmitters & Receivers

For Experiment Cubes needing an intentional wireless transmitter and/or receiver, please coordinate with the ICE Cubes service.

Intentional transmitters and/or receivers embedded on COTS parts but not used by the Experiment Cube shall be physically removed.

3.6.7 GPS Time Synchronisation

Experiment Cubes requiring time tagging and/or synchronisation with the GPS time shall synchronise by mean of NTP (in accordance with RFC 5905 [RD12]) with the NTP services of the ICF. The NTP service is provided on port UDP/123 of the ICF.

Note: GPS time is currently ahead of UTC time (see req. 4.2.3.7) by 18 seconds.

3.6.8 Data Rates

The allocated Experiment Cube data rates shall be agreed with the ICE Cubes service, either as flat rates during the whole mission, or with a timeline (e.g. within each 24-hour period, or within the mission duration). These data rates will be throttled during the Experiment Cube mission.

Note: The maximum total rates for the ICF and all Experiment Cubes together are 4Mbps (downlink) and 0.5Mbps (uplink).




3.7 Materials Requirements

3.7.1 Declared Materials List (DML)

Experiment Cube materials and external surface colours shall be agreed between the ICE Cubes service and the customer. To that effect, a Declared Materials List (DML) shall be submitted to the ICE Cubes service.

3.7.2 Forbidden Materials & Components

The following constitute a hazard and are prohibited from being used without prior approval from the ICE Cubes service: beryllium (for structures), beryllium oxide, mercury, cadmium, lithium, magnesium, zinc, polyvinyl chloride (PVC), radioactive materials, polyamide insulated cables, wet slug tantalum capacitors.

3.7.3 Surface Treatments & Protective Coatings

Treatments and/or protective coatings applied to any surfaces of the Experiment Cube shall be agreed between the ICE Cubes service and the customer.

For Experiment Cubes with an aluminium alloy structure, the following three treatments are for example allowed: Alodine 1200S, black anodization and nickel plating.

For Experiment Cubes requiring other structure materials, please coordinate with the ICE Cubes service for more information and approval.

3.7.4 Flammability

Selected materials for the Experiment Cube shall be non-flammable (i.e. considered self-extinguishing) in accordance with the standards ISO 14624-1 [RD9] or ISO 14624-2 [RD10], and/or with a UL 94 [RD11] flammability rating V-0 or higher (i.e. 5VB or 5VA).

Note: In case the non-flammability property cannot be found/ascertained for certain materials, please contact the ICE Cubes service.

If lower classified (i.e. less flame-retardant) or even flammable materials must be used due to project constraints, adequate flammability control shall be demonstrated at Cube level, with the help of the ICE Cubes service, through configuration analysis or test.

3.7.5 Offgassing

Offgassing evaluation by analysis and/or test is required, except for Experiment Cubes with non-metallic mass lower than 9072 grams, and not containing liquids, uncured adhesives, lubricants, cleaning wipes, markers, pens, gels, foams, nor foamed fluorocarbons.

In case a test is necessary, the test setup and procedure (including success criteria) shall be agreed between the ICE Cubes service and the customer.

3.7.6 Fasteners Locking

For making use of glue or gels as thread-locker in fastened joints of the Experiment Cube, please coordinate with the ICE Cubes service for preventive authorization.




3.8 Safety Requirements

3.8.1 Collection of Safety-Related Data

The customer shall provide safety-related information about the Experiment Cube as per Table 11 in Appendix D.

3.8.2 Non-Conformity with Requirements

Should it prove impossible to comply with one of the requirements of this document, the customer shall indicate:

• the description and reason for non-conformity, and • the impact of the non-conformity on safety, and • the means proposed to mitigate the impact.

3.8.3 Containment

In case of utilization of liquids, particulates, microbes, trace gases, biological matters, etc. inside the Experiment Cube, please coordinate with the ICE Cubes service for containment strategy, materials compatibility, assessment of toxicity and/or biohazard level, and preventive authorization.

Note: Electronic subsystems may contain liquids (e.g. liquid electrolyte inside wet aluminium capacitors), and need to be assessed as well.

3.8.4 Volatile Organic Compound

Small amounts of methanol, ethanol, isopropyl alcohol, n–propyl alcohol, n–butyl alcohol, acetone, ethylene glycol, and/or propylene glycol contained in the Experiment Cube shall be immediately brought to the attention of the ICE Cubes service, as they request a dedicated approval process.

3.8.5 Glass or Frangible Materials Release

All glass and frangible (shatterable) materials shall be contained within the Experiment Cube to prevent fragments from entering the ISS habitable volume.

3.8.6 Lasers

For Experiment Cubes with lasers, please coordinate with the ICE Cubes service.

3.8.7 Light Sources

All Experiment Cube light sources (e.g. LEDs) whose maximum luminance exceeds 10000 cd/m² shall be contained.

Note: For strategies to contain light, please coordinate with the ICE Cubes service.

3.8.8 Batteries & (Super-) Capacitors

For Experiment Cubes with batteries and/or capacitors and/or super-capacitors as alternate energy source, please coordinate with the ICE Cubes service.




3.8.9 Pyrotechnics

For Experiment Cubes with pyrotechnics requirements, please coordinate with the ICE Cubes service.

3.8.10 Smoke & Fire Detection

This function is performed at ICF level. As such, there is no implication for the Experiment Cube.

3.8.11 Circuit Protection, Wire Sizing & Derating

The circuit-protection function on the 5V and 12V lines is performed at ICF level (≤1.07A on the 5V line and ≤3.25A on the 12V line). Should there be any additional power lines in the Cube, additional circuit protection shall be implemented to prevent overheating/pyrolization of the wiring.

The current-carrying wires used in the Experiment Cube shall be selected with insulation ratings of 150°C or 175°C or 200°C, and with a copper wire size such that it is able to carry the maximum current level when derated for utilization in the ISS, i.e. a wire size bigger or equal to AWG26iv.

Note: For the EEE components inside the Cube, it is advised, for reliability purposes (see req. 3.10), to follow the derating rules per ECSS-Q-ST-30-11 [RD18].

3.8.12 Flight Readiness Certification

Flight readiness certification is based on reviews of data submitted by the customer. The related schedule will depend on launch readiness deadlines (cf. Table 10 in Appendix D).

The Experiment Cube will in particular need to pass an interface test (cf. §5), a functional test, and additional tests (as per the present IRD), to be documented in test reports. Depending on the particularities of the Experiment Cube, extra ad-hoc tests, verifications, and analyses may be requested to pass the safety reviews and get the flight readiness certification.

3.9 Human Factor Interface Requirements

3.9.1 Astronaut Interaction

The Experiment Cube shall in principle not require specific astronaut interaction (besides the Cube installation on and removal from the ICF).

Note: Additional astronaut interaction need prior approval from the ICE Cubes service.

3.9.2 Identification & Marking

For the flight hardware, the Experiment Cube (and/or its launch bag) shall feature the necessary flight-authorized adhesive labels reporting the data as follows:

• “For ICE CUBES”

iv Per interpretation letter TA-92-038 [RD19], an AWG26-gauged wire is able to carry 4.4A, 4.9A or 5.3A (derated for the ISS), respectively, depending on its insulation temperature rating. For higher current levels, please contact the ICE Cubes service.




• Experiment Cube number • Part number • Serial number (if any) • Bar code identifier • (Non-)hazardous materials (if needed, see req. 3.8.3) • ESD sensitive (if needed, see req. 3.5.3.2)

The ICE Cubes service will supply the required flight labels to the commercial customer.

For additional marking related to customer identification (e.g. name/logo of the commercial customer organisation), please coordinate with the ICE Cubes service.

3.9.3 Crew Safety

The Experiment Cube shall be such that the following mechanical features, if present in the Cube, are not exposed (i.e. not accessible to the astronauts):

• holes, round or slotted, in the range of 10.0 to 25.0 mm, • latches, • threaded ends of screws and bolts, • securing pins, • levers, cranks, hooks and/or controls, • burrs (typically results of machining activities).

Note: If any of the above feature needs to be exposed, please coordinate with the ICE Cubes service.

3.10 Reliability Requirements

The customer shall be responsible for the reliability of the Experiment Cube.

For guidance and recommendations on processes, verifications and tests to ensure higher Cube reliability, please contact the ICE Cubes service.




4 Experiment Cube Ground Interface Requirements

The ground facility or terminal from which the ground user (customer) operates the Experiment Cube on board the ISS is called User Home Base (UHB) in the following section. It is intended to interact with the Experiment Cube using LAN commands as well as TM and TC data processing.

Additionally, the UHB can be provided with TM (e.g. AOS/LOS schedule, air temperature, microgravity level, radiation dosimetry) which is not coming from the Experiment Cube itself but e.g. from the ICF, ESA or NASA.

The usage of the ICF IP services by the Experiment Cube is optional and a UHB is not required for a non-IP-enabled Experiment Cube.

The UHB connects with the ICE Cubes Mission Control Centre (ICMCC) via Internet, as shown in Figure 28.

Figure 28 ICE Cubes communications (concept)

4.1 Hardware Interface

The UHB ground station hardware (provided by the customer) shall be able to access the Internet, and shall be compatible with the use of a USB Type-A eToken (see req. 4.2.2.3) and of the OpenVPN client (see req. 4.2.2.2). Currently, only hardware running Linux Ubuntu, Windows or MacOS are supported.

4.2 Software Interface

4.2.1 UHB to ICMCC Interface Overview

The ICMCC offers to a UHB the following services:

• VPN connection via Internet to ICMCC




• Time synchronisation service • Data synchronisation service • TCP connection to Experiment Cube private IP • UDP connection to Experiment Cube private IP • HTTP server for housekeeping (HK) data • HTTP server for planning and support

The following table lists the IP services offered by the ICMCC to a UHB to communicate with its Experiment Cube and the possible impact of LOS (see req. 3.6.2) on the communication. Interfaces that do not require ground to flight communications are marked as N/A.

Table 6 LOS impact on communications between a UHB and its Experiment Cube

Interface Data recoverable after LOS

VPN connection via Internet to ICMCC N/A

Time synchronisation service N/A

Data synchronisation service Yes

TCP connection to Experiment Cube private IP No

UDP connection to Experiment Cube private IP No

HTTP server for housekeeping (HK) data N/A

HTTP server for planning and support N/A

4.2.2 Mandatory Software Interface Requirements

4.2.2.1 Software Host

The UHB software shall run on a dedicated hardware machine (e.g. workstation or laptop computer, see req. 4.1) under Linux Ubuntu, Windows or MacOS.

4.2.2.2 Connection to the ICMCC

The UHB connection to the ICMCC shall be established as a VPN connection using the OpenVPN client software provided by the ICE Cubes service.

4.2.2.3 Two-Factor Authentication

To connect to the ICMCC VPN, the UHB ground user shall provide two authentication factors, using a certificate-based PKI eToken (provided by the ICE Cubes service) and a password.

Note: The eToken is on loan to the customer until such time when the Experiment Cube stops being used through the ICF in orbit. The eToken remains property of the ICE Cubes service.

4.2.2.4 Security, Split Tunnelling

The UHB ground workstation is not allowed to communicate to somewhere else (over the Internet) other than with the ICMCC while the connection to the ICMCC is active.

4.2.3 Optional Software Interface Requirements

The following optional requirements apply only to Experiment Cubes that choose to use the related services provided by the ICF and the ICMCC.




4.2.3.1 Data Synchronisation Service Downlink

The UHB shall access data files downlinked from the Experiment Cube using the FTP file service provided by the ICMCC. The UHB shall use the FTP protocol and access the FTP server according to the access information provided by the ICMCC.

4.2.3.2 Data Synchronisation Service Uplink

The UHB shall uplink data files to the Experiment Cube using the FTP file service provided by the ICMCC. The UHB shall use the FTP protocol and access the FTP server according to the access data provided by the ICMCC.

4.2.3.3 Private IP Address

The UHB shall request to the ICMCC the private IP address assigned to its Experiment Cube.

4.2.3.4 Direct TCP & UDP Communication

The UHB shall communicate with its Experiments Cube at its private IP address using either TCP or UDP protocol, with implementation in accordance with RFC 793 [RD13] and RFC 768 [RD14], respectively.

4.2.3.5 TCP & UDP Protocol

The UHB shall communicate with its Experiment Cubes at its private IP address using only the TCP and UDP protocols listed in req. 3.6.1.

4.2.3.6 UDP Connection

The UHB application software shall implement an adjustable throttle for outbound UDP uplink data flows.

Note: The available bandwidth is planned and communicated by the ICMCC.

4.2.3.7 UTC Time Synchronisation

The UHB requiring time tagging and/or synchronisation with the UTC time shall synchronise by mean of NTP (in accordance with RFC 5905 [RD12]) with the NTP services of the ICMCC. The NTP service is provided on port UDP/123 of the ICMCC.

Note: GPS time (see req. 3.6.7) is currently ahead of UTC time by 18 seconds.

4.3 Experiment Cube Unit-to-System Testing

The Experiment Cube and the UHB ground application can be interface tested at Space Applications Services’ premises using the ICMCC end-to-end test environment (with flight-representative on-board interfaces) and the ICF Engineering Model. The UHB hardware (see req. 4.1 and 4.2.2.3) may remain at the customer premises (and connect via Internet).

Notes: A formal end-to-end test will in any case be performed in the frame of the Interface Test (cf. §5).




5 Experiment Cube to ICE Cubes Interface Test

A number of interface requirements (cf. Appendix A) shall be formally verified (by inspection and test) in the frame of the mandatory Experiment Cube to ICE Cubes Interface Test (cf. Table 10 in Appendix D for the timeframe).

To ensure a successful Interface Test, the Customer shall perform the relevant verifications at Cube (and UHB) level, and confirm to the ICE Cubes service their positive outcomes in a timely manner ahead of the Interface Test.

Note: More information regarding the Interface Test (e.g. organisational and logistics aspects [RD20], test procedure [RD21]) will be provided to the customer well in advance of the Interface Test.




Appendix A Verification Matrix

The abbreviations used in the table are as follows:

Applicability (“Appl.”): A = Applicable; O = Optional; Narr. = Narrative

Verification Method (“Method”): R = Review of Design; I = Inspection; A = Analysis; T = Test

# IRD § IRD Requirement Appl. Method Footnotes, Comments 1. 3 Experiment Cube Flight Interface

Requirements Title -

2. 3.1 Mechanical Requirements Title - 3. 3.1.1 Experiment Cube Connector & Feet A R, I, T* º 4. 3.1.2 Outer Surfaces & Protrusions A R, I* º 5. 3.1.3 Fins, Vents & Fans A R, I*, T º If used 6. 3.1.4 Standard Form Factors Narr. - 7. 3.1.5 Dimensions A R, I* º 8. 3.1.6 Sharp Edges A I* ¹ 9. 3.1.7 Audible Noise Title - 10. 3.1.7.1 Continuous Noise Limits A A or T º¹ 11. 3.1.7.2 Intermittent Noise Limits A A or T º¹ 12. 3.1.7.3 Audible Noise Limits Verification A A or T º¹ 13. 3.1.8 Microgravity Disturbances A A or T 14. 3.1.9 Mass and Centre of Gravity (CoG) A A or T º¹ 15. 3.2 Structural & Environmental Interface

Requirements Title -

16. 3.2.1 Environmental Conditions Title - 17. 3.2.1.1 Temperature, Pressure & Humidity

Conditions O A or T Customer’s responsibility

18. 3.2.1.2 Depressurization/Re-Pressurization Conditions

Aª A or T ¹

19. 3.2.1.3 Thermal Environment inside the ICE Cubes Facility

O A or T Customer’s responsibility

20. 3.2.2 Launch & Landing Loads A A or T ¹ 21. 3.2.3 Random Vibration Loads A/O A or T ¹ 22. 3.2.4 Shock Loads O A or T Customer’s responsibility 23. 3.3 Thermal Requirements Title -

24. 3.3.1 Temperature Control Narr. -

25. 3.3.2 Touch Temperature A A or T ¹ 26. 3.3.3 Thermal Sensor A R, I, T ¹ If needed 27. 3.3.4 Condensation Prevention A A or T

28. 3.4 Electrical Interface Requirements Title -

29. 3.4.1 DB13W3 Connector Proprietary Wiring A R, T* º 30. 3.4.2 Power A R, T º¹ 31. 3.4.3 Unexpected Power Loss A R, T ¹ 32. 3.4.4 Power Circuit Protection & Inrush Current A A, T* 33. 3.4.5 Input Capacitor A A, T* 34. 3.5 Electrical & Electromagnetic Compatibility

(EMC) Requirements Title -

35. 3.5.1 Grounding, Bonding & Isolation Title -

36. 3.5.1.1 Grounding (i.e. Ground Return) A R º¹




# IRD § IRD Requirement Appl. Method Footnotes, Comments 37. 3.5.1.2 Bonding (i.e. Chassis Ground) A T* º¹ 38. 3.5.1.3 Isolation A T* º¹ 39. 3.5.2 Electromagnetic Interference (EMI) Narr. -

40. 3.5.2.1 E-Field Radiated Emissions A T or A

41. 3.5.2.2 B-Field Radiated Emissions A T or A 42. 3.5.2.3 Conducted Emissions A T or A 43. 3.5.2.4 Radiated Susceptibility / Immunity O T or A Customer’s responsibility 44. 3.5.2.5 Conducted Susceptibility / Immunity O T or A Customer’s responsibility 45. 3.5.3 Electrostatic Discharge (ESD) Susceptibility

/ Immunity Title -

46. 3.5.3.1 ESD Susceptibility Tests O R, T Customer’s responsibility 47. 3.5.3.2 Caution Label (ESD Sensitive Cube) A I** º If needed 48. 3.5.4 DC Magnetic Fields A T º¹ 49. 3.5.5 Burn-In Narr. - 50. 3.6 Data & Communication Interface

Requirements Narr. -

51. 3.6.1 Experiment Cube IP Communication O T* º 52. 3.6.2 Experiment Cubes Data Synchronisation

Service O T* º

53. 3.6.3 Experiment Cube Download of Data O I*, T* º 54. 3.6.4 Experiment Cube Software Security Title - 55. 3.6.4.1 Anti-Virus Protection A R, T* º 56. 3.6.4.2 Periodic Virus Signatures Definitions List

Update A R, T* º

57. 3.6.4.3 OS Hardening A R, T* º 58. 3.6.4.4 In-Orbit OS Update A T If needed 59. 3.6.4.5 Encrypted Communications A - If required by ESA SCB 60. 3.6.5 Ethernet Interface A R, T* º 61. 3.6.6 Intentional Transmitters & Receivers A R or I ¹ 62. 3.6.7 GPS Time Synchronisation O T* º 63. 3.6.8 Data Rates A A or T º 64. 3.7 Materials Requirements Title -

65. 3.7.1 Declared Materials List (DML) A R, I* ¹ 66. 3.7.2 Forbidden Materials & Components A R ¹ 67. 3.7.3 Surface Treatments & Protective Coatings A R, I* ¹ 68. 3.7.4 Flammability A R ¹ 69. 3.7.5 Offgassing A A or T ¹ 70. 3.7.6 Fasteners Locking Narr. - ¹ 71. 3.8 Safety Requirements Title - 72. 3.8.1 Collection of Safety-Related Data A - ¹ 73. 3.8.2 Non-Conformity with Requirements A - ¹ 74. 3.8.3 Containment Narr. - ¹ 75. 3.8.4 Volatile Organic Compound A R ¹ If used 76. 3.8.5 Glass or Frangible Materials Release A R ¹ If needed 77. 3.8.6 Lasers Narr. - ¹ 78. 3.8.7 Light Sources A R ¹ If used 79. 3.8.8 Batteries & (Super-) Capacitors Narr. - ¹ 80. 3.8.9 Pyrotechnics Narr. - ¹ 81. 3.8.10 Smoke & Fire Detection Narr. - ¹




# IRD § IRD Requirement Appl. Method Footnotes, Comments 82. 3.8.11 Circuit Protection, Wire Sizing & Derating A R, A ¹ 83. 3.8.12 Flight Readiness Certification Narr. - ¹ 84. 3.9 Human Factor Interface Requirements Title - 85. 3.9.1 Astronaut Interaction A - º¹ 86. 3.9.2 Identification & Marking A R, I** º Service’s responsibility

for commercial customer 87. 3.9.3 Crew Safety A R, I* ¹ 88. 3.10 Reliability Requirements A - Customer’s responsibility 89. 4 Experiment Cube Ground Interface

Requirements Narr. -

90. 4.1 Hardware Interface A T* If UHB needed 91. 4.2 Software Interface Title -

92. 4.2.1 UHB to ICMCC Interface Overview Narr. -

93. 4.2.2 Mandatory Software Interface Requirements

Title -

94. 4.2.2.1 Software Host A T* If UHB needed 95. 4.2.2.2 Connection to the ICMCC A T* º If UHB needed 96. 4.2.2.3 Two-Factor Authentication A T* If UHB needed 97. 4.2.2.4 Security, Split Tunnelling A T* If UHB needed 98. 4.2.3 Optional Software Interface Requirements Narr. -

99. 4.2.3.1 Data Synchronisation Service Downlink O T* º 100. 4.2.3.2 Data Synchronisation Service Uplink O T* º 101. 4.2.3.3 Private IP Address O T*

102. 4.2.3.4 Direct TCP & UDP Communication O T* º 103. 4.2.3.5 TCP & UDP Protocol O T* º 104. 4.2.3.6 UDP Connection O T* º 105. 4.2.3.7 UTC Time Synchronisation O T* º 106. 4.3 Experiment Cube Unit-to-System Testing Narr. - 107. 5 Experiment Cube to ICE Cubes Interface

Test A T* ¹

* These Inspections and Tests will in principle be formally performed in the frame of the Interface Test (cf. §5 and Table 10 in Appendix D).

** These Inspections will be performed in the frame of the Cargo Review (cf. Table 10 in Appendix D).

º These verifications will in principle be captured (partially or totally) in the specific Experiment Cube ICD (cf. §1.1) for the Experiment Cube

¹ These verifications will in principle be captured (partially or totally) in the Flight Safety Data Package (FSDP) for the Experiment Cube




Appendix B Drawings

B.1 Mechanical Interface Drawing to Position the DB13W3P Male Connector on a 1U Cube (dimensions in mm)

Table 7 Cut-out dimensions for front and rear mounting methods for DB13W3P connector

A B C D E F G

Tolerance [mm] ±0.13 ±0.13 ±0.13 ±0.13 ±0.13 ±0.13 ±0.05

Front mounting method [mm] 44.27 22.14 47.04 23.52 13.03 6.52 2.10

Rear mounting method [mm] 42.51 21.25 47.04 23.52 11.40 5.71 3.35




Appendix C Random Vibration Loads

Experiment Cubes with safety-critical and/or interface-critical structures shall maintain structural integrity (no fracture, disassembly, etc.) when exposed to one of the random vibration environments shown in section C.1 or C.2. The loads are applicable for each axis. The levels shall be applied sequentially with a duration of 60 seconds.

C.1 Attenuated Random Vibration Environment

Table 8 (based on Table 3.1.1.2.1.2.3.1-1 of SSP 50835 [RD4]) is to be used as input random vibration environment directly on the Cube.

Table 8 Random vibration environment attenuated by 7.6mm of bubblewrap

Frequency [Hz] ASD [g2/Hz] dB change dB/Oct 20 0.2 40 0.2

200 2.5E-4 -29 -12.5 2000 6.25E-7 -26 -7.83

Total grms 2.56

C.2 Unattenuated Random Vibration Environment

Table 9 (based on Table E.2.3-3 of SSP 50835 PIRN 50835-NA-0022B [RD4] plus 3dB positive margin, as specified in §7.4.2 of SPX-00001047 [RD5]) is to be used as input random vibration environment on a Cube packed in its cushioning launch bag (e.g. bubblewrap).

Table 9 Random vibration test profile enveloping Dragon and Cygnus

Frequency [Hz] ASD [g2/Hz] dB change dB/Oct 20 0.04

200 0.04 2000 0.002 -13.0 -3.92

Total grms 4.53

Note: Experiment Cubes vibration tested using the above unattenuated profile will be qualified for launch solely using SpaceX Dragon and Northrop Grumman Cygnus, i.e. the two launchers most used by the Experiment Cubes so far. For unattenuated test profiles enveloping also Russian and/or Japanese launchers, please contact the ICE Cubes service.




Appendix D Typical Timeline and Required Documents

The following timeline of launch-minus dates are generic. Tailored agreements can be discussed during the contract negotiations.

Table 10 Experiment Cube project typical timeline

Event NLT Date (Launcher-Dependant)

Dragon Cygnus Preliminary Launch Manifest L-11 months Final Launch Manifest L-6 months Flight Safety Review (FSR) Phase II L-5 months Interface Test in Brussels (cf. §5) L-3 months L-4 months FSR Phase III (nominal cargo) L-12 weeks L-17 weeks Cargo Review in Turin (nominal cargo) L-10 weeks L-15 weeks FSR Phase III (late cargo)¹ L-8 weeks Cargo Review in Turin (late cargo)¹ L-5 weeks Delivery to NASA JSC (in case of direct shipment)¹ ² L-2 weeks Very late (biological) cargo delivery at Launch Site¹ ² L-5 days / L-3 days L-7 days / L-5 days

¹ Subject to manifesting at L-11 months and availability of late cargo opportunity ² Cargo Review based on pictures; Experiment Cube shipped or directly handed over to NASA

Table 11 Documents to be produced by the customer

Documents to be produced by the customer

Reference* Format Due Date (NLT)

Remarks

Experiment Cube’s Questionnaire (filled)

ICU-SA-TN-xxx Word Initial contact

Initial Experiments Description ICU-SA-TN-xxx Word + Excel

In advance of kick-off

Experiment Cube to ICE Cubes Service ICD

ICU-SA-ICD-xxx Word + pdf

L-6 months L-3 months

Based on ICU-SA-ICD-002 [RD2]

Collection of Safety-Related Data

ICU-SA-PRES-xxx / ICU-SA-

SDP-xxx

PowerPoint / Word


To be updated for each FSR phase

Experiment Design/Operations Description and Verification Plan

ICU-SA-RP-xxx Word + pdf


Could be a single document

Experiment Cube Declared Components List

ICU-SA-LI-xxx Word + pdf

L-6.5 months

Experiment Cube Declared Materials List


L-6.5 months L-3.5 months

Experiment Cube Declared Process List


L-3.5 months

Analysis Reports as necessary for interface- and safety-related verifications


L-6 months Depending on the Cube

characteristics Test Reports as necessary for interface- and safety-related verifications


L-3 months Depending on the Cube

characteristics Ancillary documents necessary for shipping/handover

Cf. ICU-SA-TN-035 [RD22]

* The customer can use his/her own coding for documents reference numbering, if available