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1 Nokia Siemens Networks CN34015EN40GLA3

MGW in Bearer Independent Circuit Switched CoreNetwork

MSS MSS,I-BCF

NcBICC, ISUP, SIP-I

HLR-FE

MGW MGW,I-BGF

NbIP, ATM, TDM Backbone

McH.248

Mc/MnH.248

subscriber database

IN

BSC

RNCWCDMA Iu-CS

GSM

AoIP, Ater

TC

A

A

PSTN/ISDN

VoIP/IMS/SIP

Other PLMNSIP,SIP-I,BICC

PSTN

Mb/Nb(SIP-I)/Nb

Mb

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Capacity in MGW (Open MGW)

Type of connectivity Number of interfaces

TDM STM-1/OC-3 80 + 80

IP for user plane (GE) 24 + 24

IP for user plane (10GE) 6 + 6

IP for control plane (GE) 1 + 1

IP for control plane (10GE) 1 + 1

IP for O&M 2 + 2

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Capacity in MGW (MGW based on IPA2800)

Type of connectivity Number of interfaces

TDM STM-1/OC-3 56 + 56

IP for user plane (GE) 16 + 16

ATM STM-1/OC-3 56 + 56

TDM E1/T1 1440

IP for control plane with L2 1 +1

IP for O&M with L2 2 + 2

IP for control plane with L3 1 + 1

IP for O&M with L3 1 + 1

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Functional units in MGW based on IPA2800

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Control and Administrative Computer Unit(CACU)Purpose: CACU controls the ATM

switch fabrics and establishesconnections for calls.Its ATM switching managementfunctions comprises:o Establishment of both internal and

external connections via the SFU,

including ATM circuit hunting andaddress analysis.o Management and control of the SFU,

A2SU, and MXUo Transmission resource managementRedundancy: 2N

PIU: CCP18-C (Intel Pentium M)Interface: ATM interface to MXUMax. number of units insubracks: 2 CCP18-C

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Central Memory (CM)

Purpose: CM serves as the central

data storage and distribution facility.It also handles the centralised partof the common channel signalling,for example, digit analysis .Redundancy: 2NPIU: CCP18-C (Intel Pentium M)Interface: ATM interface to MXUMax. number of units insubracks: 2

CCP18-C

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Interface Control and Signaling Unit (ISU)

Purpose: ISU is responsible for

signalling gateway functionsbetween access networks and MSCServer.Its task include the following:o Process MTP and SCCP of both

narrowband and wideband SS7

signalling.o Messange handling and processing

functions related to the signallingchannel connected to it.

Redundancy: N+1PIU: CCP18-C (Intel Pentium M)

Interface: ATM interface to MXUMax. number of units insubracks: 18 (New deliveries inMGW U5.0) CCP18-C

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Voice Announcement Unit (VANU)

Purpose: VANU controls the

announcement function of MGW.It stores the individual speechsamples, constructs completeannouncements from them andsends them to the DSP units forfurther processing.

Redundancy: NonePIU: CCP18-C (Intel Pentium M)Interface: ATM interface to MXUMax. number of units insubracks: 2

CCP18-C

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Switching Unit (SWU)

Purpose: SWU is a LAN/Ethernet

Switching function, which providesLAN/Ethernet interfaces for:o Control plane (H.248 and M3UA)o O&M signalling (e.g. towards NetAct)ESA40-A has four Gb Ethernet ports .This allows the separation of controlplane and O&M traffic to dedicatedports within one pair.ESA40-A supports L3 connectivitysolution.Redundancy: SN+PIU: ESA40-A (LAN/Ethernet switch)

Interface: LAN/Ethernet to OMU, ISUand site LANMax. number of units in subracks: 6

ESA40-A

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Operation and Maintenance Unit (OMU)

Purpose: OMU handles all theMGWs crucial upper -layer system

maintenance functions, such as:o Hardware configuration managemento Hardware Management System (HMS)

supervisiono Associated centralised recovery

functions.In the event of fault, the OMUautomatically activates appropriaterecovery and diagnostics procedureswithin the MGW.Redundancy: 2NPIU: CCP18-A (Intel Pentium M)Interface: ATM interface to MXU,

LAN/Ethernet via ESA40-A,Duplicated SCSI, Service Terminalinterface, Duplicated HMS interfaceMax. number of units in subracks: 2

CCP18-A

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OMUs storage devices

Purpose: OMU has two dedicated

hard disk units which serve as aredundant storage for:o The entire system softwareo The event buffer for intermediate storing

of alarmso The radio network configuration files.Backup copies are made onto a USBmemory stick that can be connected tothe CCP18- A PIUs front plate. Redundancy: 2NPIU: HDS-BInterface: SCSI (Small ComputerSystem Interface)Max. number of units in subracks: 2

HDS-B

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Transcoding Unit (TCU)

Purpose: TCU includes a number

of signal processors whose mainfunctions are:o Transcodingo Signal level controlo Discontinuous transmission

All DSPs of the unit can be freelyallocated within the MGW.Redundancy: SN+PIU: CDSP-DTInterface: ATM interface to MXUMax. number of units insubracks: 90

CDSP-DT

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Network Interfaces

SFU

MGW

2*1GB

IP Backbone

SFU

RNC/MGW

RNC/MGW

SDH/Sonet

NPGEP

ATM (AAL2) forUserplane

NPS1(P) (PIU:NP8S1)

8*STM-1/OC-3interfaces

SDH/Sonet

PSTNBSSIWFMSS

n*E1/T1via ADM PSTNMSS,

BSSIWF

PSTN

BSS

RNC

IWSEPMXU

NPS1(P)

NIWU

PSTN/A/IWF/Ater Interface

IWSEP/IWSTP (PIU:IW8S1- A)

8xSTM-1 interfaces

NIWU (PIU: IW16P1A) 16*E1/T1/JT1 TDM interface

IP for Userplane

NPGEP (PIU:NP2GE)

2x1GB Electrial orOptical Ethernet

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Network Interface Unit (NPGEP)

Purpose: NPGEP provides

2x1000Base-T Ethernet electrical and2x1000Base-LX/-SX Ethernet opticalinterfaces supporting both single-modeand multi-mode fibers and the meansto execute physical and IP layerfunctionality.It maps packets to and from Ethernet

frame structure includingo Packet classification, forwarding andscheduling

o Traffic managementRedundancy: 2NPIU: NP2GE-A

Interface: 2x1000Base-T Ethernetelectrical, 2x1000Base-LX/-SXEthernet opticalMax. number of units in subracks: 16 NP2GE-A

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Network Interface Unit STM-1 (NPS1/NPS1P)

Purpose: NPS1(P) provides SDHSTM-1 interfaces and handles bittiming, line coding, and timing recovery.Redundancy: 2NPIU: NP8S1-ACapacity :Eight optical STM-1/OC-3interfaces, 155.52 Mbit/s each.

Interface: ATM interface to SFU, Clockreference output to TSS3-AMax. number of units insubracks: 7NPS1(14NPS1P)

NPS1P/NPS1

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Network Interface Unit STM-1/OC-3(IWSEP/IWSTP)Purpose: IWSEP/IWSTP providesSTM-1/OC-3 interfaces.The main tasks are as follows:o Implements the TDM over SDH channel

bit stream conversion to the AAL1 ATMchannel cell stream to be forwarded toSFU and vice versa.

o Support Ater interface.o Support up to 128 timeslots for SS7signalling.Redundancy: 2NPIU: IW8S1-ACapacity :Eight optical STM-1interfaces

Interface: ATM interface to SFU,RS232, Clock reference output toTSS3-AMax. number of units in subracks:14

IWSEP/IWSET

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Network Interface Unit TDM (NIWU)

Purpose: IW16P1A containsE1/T1/JT1 interfaces for TDMsignalling and user plane.The unit also performs the user planeconversation between the TDM formatand the ATM format.Redundancy: NonePIU: IW16P1ACapacity :16 physical TDM electricalinterfacesInterface: ATM interface to SFU,RS232, Clock reference output toTSS3-AMax. number of units in subracks:30/60/90

IW16P1A

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ATM Connections to SFU

Switching and multiplixing in MGW isbased on the ATM technology.The units are:

o SFUs which are used for switching the callprocessed by MGW

o MXUs for connecting the low-bit-ratenetwork interface units to the SFUs.

Allocation of the MGWs ATMconnection: 2.5 Gbit/s serial switchingfabric port interface (SFPIF2G5):

o 32 ports of 3.9 Mcells/s ATM cell rate (or1.65 Gbit/s user data rate)

o One input or output port consists of oneserial data line of 2.5 Gbit/s

o Ports can be conbined for higher data rateso

Duplication needs its own fabric porto The maximum cable length is 5 m

HubSFU

MX

UMX

U

M X U

M X U

CMCM

1-22pcs

CMCACU

2pcs

CMOMU

2pcs

FDU WDUWDU

CMISU

1-8 pcs

CMIWSEP/IWSTP

0-14 pcs

CMNPS1/NPS1P

0-14 pcs

CMNPGEP

0-16 pcs

CM A2SU

(used in release

prior to U5.0 only)

0-1 pcs

CMTCU

0-9 pcs

CMNIWU

0-9 pcs

CMISU

1-2 pcs

TBU

EHU

3-11

TBU

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Switching Fabric Unit (SFU)

Purpose: SFU provides part of the ATM cell switching function.

It provides full accessibility and isnon-blocking at ATM connectionlevel.SFU supports point-to-point andpoint-to-multipoint connectiontopologies, as well as,

differentiated handling of various ATM service categories.Redundancy: 2NPIU: SF20H, SF10E (only for upgrades)Capacity :2.5 Gbits/sInterface: ATM interface Max. number of units in subracks: 2

SF20H

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Multiplexer Unit (MXU)

Purpose: MXU multiplexes traffictributary units towards SFU.It includes part of the AMT layerfunctionality, such as: o Policingo Statisticso OAMo Buffer managemento SchedulingRedundancy: 2NPIU: MX1G6-ACapacity :1.6 Gbits/sInterface: ATM interfaces

Max. number of units in subracks:24

SF20H

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Timing and Synchronization, SDH Stratum 3 (TSS3)& Timing Buffer (TBUF)

TSS3 TBUF

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Clock BUS

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Hardware Management Subsystem (HMS)

Purpose: HMS has 3 hierarchically organised layers of equipment.o Hardware Management Master Nodes (HMMNs)

Uppest level in the hierarchyControl the whole subsystemLocated in OMU

o Hardware Management System Bridge Nodes (HMSBs)

Intermediate level in the hierarchyServe as bridges which connect HMMNs to the lowest-level block in thehierarchyLocated in TBU (TSS3s and TBUFs)

o Hardware Management System Slave Nodes (HMSSs)Locate in every PIUs

Redundancy: 2N

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HMSSystem

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HMS BUS

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Power Distribution Subsystem

PD30

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External Hardware Alarm Unit ( EHU)

Purpose: EHU receive external alarmsand send indications of them asmessages to OMU-located externalalarm handler via HMS.

A second function is to drive:o the optional External Hardware Alarm

panel (EXAU-A)o the cabinet integrated lampo CAIND alarm indicator located on top ofCAMA cabinet and possible other external

equipment.Redundancy: NonePIU: EHATInterface: 32 voltage controlled inputs,

8 current controlled inputs, 16 generalpurpose 20 mA current outputs.Connections to external devices viacabling panal1 in the rear of CAMA.

SF20H

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Base Module

ExpansionModule

MGW Cabinets and Subracks

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MGW Configuration

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CAMA Subrack 1 (Base Module)

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CAMA Subrack 2 (Base Module)

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MGW Expansion Modules

Three subrack configuration

alternatives Subrack configuration with

IWS1E/T Subrack configuration with

NIWU/NIP1 Subrack configuration with TCUMain difference between the subrack

configurations is the number ofTCU/A2SU units and numberand type of interface units

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