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International Civil Aviation Organization
REGIONAL WORKSHOP ON AMHS
AMHS
Detailed specifications
(Dakar, 28-29 May 2013)
AMHS WORKSHOP
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�High level requirements
�ATS Message Service
�Validation performed
�Implementation plans
�Transition from AFTN or CIDIN to AMHS
Outline
AMHS WORKSHOP 2
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AMHS: High level requirements
� Provide a messaging service over the ATN
� Deliver a level of service at least equivalent to that of the AFTN
� Allow transition from AFTN to ATN
� Allow transition from CIDIN to ATN
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AMHS: AFTN Functionalities
� Store-and-forward messaging service ensuring no loss of messages
� 3 Transmission Priorities
� 5 Priority Indicators
� Multiple addressee messages
� Collective addresses
� Possibility to convey optional heading information
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AMHS Summary
� Operational requirements
� MHS/X.400 Overview
� Definition of the ATS Message Service
� AMHS Components
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AMHS Operational requirements (1/4)
AFTN AFTN
ATN
Infrastructure
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AMHS Operational requirements (2/4)
AFTN AFTN
ATN
Infrastructure
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AMHS Operational requirements (3/4)
AFTN AFTN
ATN
Infrastructure
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9AMHS WORKSHOP
AMHS Operational requirements (4/4)
A T N AFTN AFTNA T N
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AMHS / ATS Message Service
MHS/X.400 Overview : The Standards (1/2)
� CCITT / ITU-T X.400 Series of Recommendation
Message Handling Systems
� ISO/IEC 10021 (9 parts) : Both texts are aligned in principle.
� The ATS Message Service (AMHS) fully complies with the ISO standards
which are mature and widely implemented.
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ATSMHS Users
� Direct AMHS users shall use either the basic ATSMHS or the
extended ATSMHS at an ATS message user agent.
� Indirect AMHS users shall use only that part of the ATSMHS which
corresponds to AFTN functionalities by using the interworking
capability provided by an AFTN/AMHS gateway.
� X.400 includes some organisational restrictions
� ISO is the applicable AMHS standard
AMHS WORKSHOP 11
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AMHS / ATS Message ServiceX.400 Overview : functional components
� MTA = Message Transfer Agent
– Message Switch
� UA = User Agent
– User Access to the MTA
– Human Machine Interface is not standardised
� MS = Message Store
– Intermediary storage between MTA and UA
– Usually co-located with MTA
� AU = Access Unit
– Conversion to other Messaging Systems
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AMHS / ATS Message ServiceX.400 Overview : Functional Components (MTA)
MTS
MTA
P1
P1
P1
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AMHS / ATS Message ServiceX.400 Overview : Functional Components (UA)
MTS
P3
UA
MTA
P1
P1
P1
MHS
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AMHS / ATS Message ServiceX.400 Overview : Functional Components (MS)
MTS
P3
UA
MTA
P1
P1
P1P7
MS
MHS
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AMHS / ATS Message ServiceX.400 Overview : Functional Components (AU)
MTS
P3
MTA
P1
P1P7
MS
other
messaging
system
AU
P1
MHSUA
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AMHS / ATS Message Service - X.400 Overview :
Protocols, Formats and Operations (1/2)
P3 P3P1
P2 (Inter-Personal Message or IPM)
protocols
format
submission transfer delivery
UA MTA MTA UA
Operation without message store
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AMHS / ATS Message Service - X.400 Overview :
Protocols, Formats and Operations (2/2)
P3 P7P1
P2 (Inter-Personal Message or IPM)
protocols
format
submission transfer delivery retrieval
UA MTA MTA MS UA
Operation with message store
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AMHS / ATS Message Service
X.400 Overview : Messages
MESSAGE
ENVELOPE (P1 or P3)
CONTENT (P2)
HeaderFrom :To :Subject :
BodyThis is the text which I want to send you etc.
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AMHS / ATS Message Service
X.400 Overview : Probes and Reports
� Probe = Message without Content (envelope only)
� Report = To inform the message originatorabout the outcome of a messageconveyance:
– Delivery Report (if delivery successful)
– Non-Delivery Report (if transfer or delivery failed)
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AMHS / ATS Message Service
X.400 Overview : Management Domains
� Management Domain :an organisational entity which manages at least one MTA (or several), and is responsible for the users connected to its MTA(s)
� a Management Domain can be :
– ADMD (Administrative Management Domain), generally operated by a public telecom operator.
– PRMD (Private Management Domain), generally operated by a private company or organisation.
� Usually an ADMD provides services to the public or a a community, while a PRMD serves only its own organisation.
� In accordance with ITU-T, ICAO is now the name an ADMD
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AMHS / ATS Message Service - X.400 Overview :
Examples of MD Interconnections
ADMD1
UA
MTA
MS
ADMD2
PRMD1
PRMD4
PRMD2
PRMD5
ADMD3
PRMD3
Country ACountry B
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AMHS / ATS Message Service
X.400 Overview : Addressing
Each user (UA) in a Management Domain
is identified with an O/R Address consisting
of a set of attributes
� Four forms of O/R Addresses exist:
– mnemonic (mostly used)
– numeric
– postal
– terminal
� The available standard attributes for mnemonic O/R addresses are :
– organisation-name (O)
– organisational-units-name (4 values) (OU1 to OU4)
– personal-name (surname, given-name, initial) (S, G, I)
– common-name (CN)
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AMHS / ATS Message Service
X.400 Overview : Addressing
� The Management Domain
is globally identified by 2
or 3 standard attributes:
– Country-name (C)
– ADMD-name (A)
– PRMD-name (P)
Country-name : XXPRMD-name : South Africa
Organisation-name : ATNS
Organisational-unit-name-1 : Telecommunications
Surname : Kirkman
Given-name : Lindi-Lee
ADMD : ICAO
C=XX / A=ICAO / P=KENYA / O=ATNS / OU1 =COM Division / S=Kirkman / G=Lindi-Lee
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AMHS / ATS Message Service
AFTN / X.400 : functional equivalence
AFTN X400
AFTN Centre MTA
AFTN Station UA
Addressee Indicator O/R Address
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AMHS / ATS Message Service
Support of the ATS Message Service
�The provider of the ATS Message Service is called
ATS Message Handling System (AMHS)
AFTN MHS/X.400 AMHS
AFTN Centre MTA ATS Message Server (alsoincludes optional MS)
AFTN Station UA ATS Message User Agent
AU(+MTA)
AFTN / AMHS Gateway
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AMHS / ATS Message Service
ATS Message Handling System (AMHS)
AMHSUA
MTA
MS
AFTN
AU
ATS MessageUser Agent
ATS MessageServer
ATS MessageServer
AFTN / AMHSGateway
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AMHS / ATS Message Service
ATS Message Server
•& ATN transport service
ATS messageprotocol stack
Access to
ATN subnetwork
(P1 over upper layers)MTAMS (optional)
To other ATS Message Servers
or AFTN/AMHS Gatewaysto ATS Message User Agents
Access to
ATN subnetwork
(can be P3 or P7
Protocol selectedas a local matter
over UL)
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AMHS / ATS Message Service
ATS Message User Agent
ATN transport service
Access to
ATN subnetwork
UA
userinterface
To an ATS Message
Server
(can be P3 or P7
Protocol selectedas a local matter
over upper layers)
This part is
out of the scope
of the SARPs
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AMHS / ATS Message ServiceAFTN/AMHS Gateway (General Design)
ATN transport component")
AFTN procedure
protocol stack
handler ("AFTN
Access to
AFTN
service
MTA ("ATN Component")
ATS message
To other ATS Message Servers
or AFTN/AMHS Gateways
Normal flow
of messages
Message Transfer and Control Unit (AU)
Acces to
ATN subnetworks
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AMHS / ATS Message ServiceAFTN/AMHS Gateway (General Functionalities)
� Management of AFTN procedure
� AFTN ITA-2 to/from IA-5 conversion if needed traffic logging
� Conversion of AFTN messages (and of certain service
messages) to/from AMHS messages and reports
� Rejection of AMHS messages which cannot be conveyed
over the AFTN
� Address mapping : conversion of AFTN addressee indicators
to/from O/R addresses
� Full MHS/X.400 support by ATN Component
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AMHS / ATS Message Service
AFTN/AMHS Gateway (Conversion of Messages)
MESSAGE COMING FROM AFTN
PRI : FF
FT: 011030
THIS IS THE MESSAGE TEXT
-O/R Address
- Receipt Notification
request if SS
-O/R Addresses (orig.+dest.)- Transmission priority
P2
P1
MESSAGE CONVERTEDIN THE AMHS
LFPOYIYA
011030
THIS IS THE MESSAGE
ZCZC BAC002
LFPSYHYX
NNNN
Other P1 envelope elementsare generated by the MTCU
TEXT
FF
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AMHS - AFTN/AMHS Gateway
(Address Mapping)
� Use of XF-Addresses Use of MF-Addresses(defined in the SARPs) (without further SARPs
specification: local matter)
� C=XX C=XX
� A=ICAO A= ICAO
� P=France LFPOZTZX P=France
� O=AFTN O=LFFF
� OU1=LFPOZTZX OU1 = LFPO
� CN= LFPOZTZX
� Two types of addressing plans (common or local)
� Two ways of mapping addresses
}}
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MTA
MTA
MTA
MTA
AMHS
UA
UA
UA
UA
UA
UA
UA
ATS Message Service - Position of AMHS vs ATN Internet
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Conclusion on AMHS (1/2)
� A store-and-forward messaging system over the ATN Internet or over existing
industrial solutions
� The system fully complies with mature standards
� Widely available using off-the-shelf products
� Full interoperability with AFTN via the AFTN/AMHS Gateway
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Conclusion on AMHS (2/2)
� Significant improvements with the Basic ATS Message Service:
– no limit on message length
– no limit on number of recipients per message
– non-delivery reports
– subject indication
– very large extension capability
(redirection, security) with functional groups (FGs) =>Extended ATS
Message Service
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International Civil Aviation Organization
Questions?
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International Civil Aviation Organization
Thank you