02 02 Cn34012en32gln2 Msc Server

8/12/2019 02 02 Cn34012en32gln2 Msc Server

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MSC Server, Gateway Control Server and Circuit Seitched Data

Server Architecture

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1 Nokia Siemens Networks CN34012EN32GLN2

MSS,GCS&CDSMSS,GCS&CDS ArchitectureArchitecture


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Objectives

After completing this module, the student should be able to:

Mention connectivity of Network Elements in Release 4List the main functions of the MSS, MSSu, GCS and CDS

Explain the main functions of each functional unit

List the redundancy principles for the units in MSS, MSSu,

GCS and CDS

Explain the main difference between the standalone MSS

and integrated MSS


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Network Elements in Rel4


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MSS, MSSu & GCS

MSS

Standalone MSS: New delivery from M12 onwards Integrated MSS : Same as current MSCi

MSSu

Upgraded from the operators current MSCi, removing units handling

user plane.

GCS

A compact standalone Gateway Control Server , does not have BSU &

VLRU (Transit switch functionality).

CDS New delivery from M12 onwards. Used for circuit switched data calls

along with standalone MSS.


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New Hardware Introduced in M14

Ethernet Message Bus (EMB)

ESB14-A

GSWB2k

ET16 and ETS2

New Mass Memory- Blu-Ray DVD


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Hardware Architecture for Integrated MSS/GCS

CDSU

TGFP

BDCUPAUMCCSUBSUMFSUCASU

CHU OMUSTUVLRUCMCMU

PSTN

PBX

NSS

BSS

LAN LAN LAN

VDU and LPT

X.25

ET

GSW

CCMU

MESSAGE BUS

ET

ET

ECET

CLSEXT.

SYNC

VANG

O&M LAN Switch

IPET

LAN

IP Trunk

TGSU

IP

IP Control PlaneLAN Switch

IP User PlaneLAN Switch

The BSU and VLRU are partof the Integrated MSS,not the GCS.


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Operating Principles for CDS

BSS/RAN PSTN/ISDN

MGWMGW

MSSMSS

CDSCDS

CDSU

H.248/Megaco

IWF control

interface

TDM/PCM

Ta Tb


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New Standalone MSS/GCS Cabinets in M14


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MSS and CDS floor layout


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MSSu Cabinets in M14


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Integrated MSS/GCS Cabinets


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Functional UnitsFunctional Units


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Ethernet-based Message BusEMB

The Ethernet-based Message Bus (EMB) enables higher capacity and reducedfootprint in the MSS and the HLRi.

The LAN topology used in the EMB is a switched LAN. Each computer has apoint-to-point connection to a cabinet level LAN switch, ESB26 or compatible.

These LAN switches are further connected to a second stage LAN switch,ESB14-A or compatible. All connections are full duplex.

ESB14-A is used as second level Ethernet switch to enable the interconnectionbetween first level Ethernet switches in EMB configurations.

ESB14-A is a 14-port managed Ethernet switch integrated into the M98mechanics. ESB14-A has 10 optical gigabit Ethernet ports

The speed of links between computers and cabinet level LAN switches is 100Mbps and the speed of links connecting the cabinet level LAN switches to thesecond stage LAN switches is 1 Gbps.

The EMB requires the use of CP816-A or compatible processor plug-in units,

which have four Ethernet ports. Two ports are used for EMB LANs and two ports forexternal LANs. The EMB LANs are totally separated from the external LANs.


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Ethernet-based Message BusEMB

100Mbps

1Gbps

ESB26

OMU,1OMU,0CCSU,2CCSU,1CCSU,0

ESB26

H LR U, 0, 0 H LR U, 0, 1H LR U, 1, 0 H LR U, 1, 1

1Gbps

100Mbps

EMB,0

EMB,1

Second s t a ge sw i t ch

Cab ine t leve l

sw i t che s

Compu t e r s

ESB14-A

ESB14-A

ESB26 ESB26


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Cabinet in MSS/GCS:14AC


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Central Memory and Marker (CMM)

Function: CMM contains the functionality

of the CM, Marker (optional), and CCMUin

the same functional unit.

Redundancy: 2n

CMM in a DC3C-B cartridge


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Cellular Management Unit (CMU)

Function:The CMU controls the cellular

radio network.

Redundancy: 2n

CMU in a DC4C-B cartridge


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Statistical Unit (STU)

Function:The STU collects raw traffic

measurements, supervises the load of the

exchange, maintains various counters andproduces statistical reports.

Redundancy: 2n

STU in a MC2C-A cartridge


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Charging Unit (CHU)

Function:The CHU collects charging data,

maintains various counters and produces

detailed charging records.

Redundancy: 2n

CHU in a MC2C-A cartridge


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Operation and Maintenance Unit (OMU)

Function:

handles all centralised supervision, alarm and

recovery functions

handles the connections towards user interface.

The connections are made using IP network or via

V.24 interface.

collects the wired alarms from the exchange as well

as from the external equipment connected to the

system.

has dedicated storage devices, which serve as a

storage for the entire system software of the network

element as well as for the event buffer for

intermediate storing of alarms.

Redundancy: 2n

OMU in a CC4C-A cartridge


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Basic Data Communication Unit (BDCU)

Function:The BDCU provides

communication links to the operation and

maintenance network, to the SMS Centerand to the Billing Center.

The BDCU provides the following external

interfaces:

analog X.25

digital X.25

LAN/Ethernet

Redundancy: n

BDCU in MC2C-A cartridge


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Clock System (CLS) 1/2

CLSU

CLBU CLBUCLBU CLBU

CLS includes CLSU (Clock System Unit) and CLBU (Clock and Alarm Buffer Unit)


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Clock System (CLS) 2/2

Clock System Unit (CLSU)

Function:

The CLSU generates the clock and synchronization signals

and transmits them further to the CLBU units in the other

cabinets.

The CLSU also collects the wired alarms from the units in the

14AC and send them further to the OMU.

Redundancy:2n

Clock and Alarm Buffer Unit (CLBU)

Function:

The CLBU distributes the clock and synchronisation signals

within the same cabinet.

The CLBU also collects the wired alarms from the units

whose timing it handles and transfers them to the OMU.

Redundancy:2n

Two independent

CLSUs in a CLOC-B

cartridge

Two independent

CLBUs in a CLAC-B

cartridge


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LAN Switch Unit (SWU)

Function:

collects signalling data from the BSUs,

CCSUs, SCPUs and SIGUs and sends itfurther to the IP network via external LAN

switches and routers with a uplink

connection.

collects O&M signalling data from the

OMU, BDCUs and STU/CHU units and

sends it further to the IP network via

external LAN switches and routers with a

uplink connection.

In M14 system level, the LAN switch units

are also used in Ethernet Based Message

Bus.

Redundancy: 2nSWU in LASWC-A cartridge


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Visitor Location Register Unit (VLRU)

Function:The VLRU contains information

of each subscriber currently served by the

MSC Server.

Redundancy: 2n

VLRU in a MC2C-A cartridge


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Signalling Unit (SIGU)

Function:The SIGU has the functionality of

the CCSU, except that the SIGU can utilise

only an IP-based signalling network.

Redundancy: n+1

SIGU in a MC2C-A cartridge


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Base Station Signalling Unit (BSU)

BSU in a MC2C-A cartridge

Function:

The BSU provides BSSAP and RANAP

protocols that perform the signalling

functions between radio networks and

MSS.

The BSU has SIGTRAN functionality. If

the A-interface is connected directly to the

Integrated MSS, then the BSU also

controls the TDM lines.

Redundancy: n+1


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Cabinet in MSS/GCS:14BC

Note: 14 BC has the similar functional units in 14AC, and there is an option to installed

Indirect Access Unit (INDU) in 14BC.


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Indirect Access Unit (INDU)

Function:The INDU enables an indirect

connection for such service providers, which

do not have their own physical subscribercircuits to the exchange.

Redundancy: 2n

INDU in MC2C-A cartridge


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Common Channel Signalling Unit (CCSU)

Function:

handles CCS7 signalling functions towards

both PSTN and the other network elements

in the SCN. CCS7 signalling traffic can be

carried over both PCM lines (TDM) and the

IP network with SIGTRAN.

handles MEGACO (Media Gateway

Control) signalling.

controls the PCMs running to both PSTN

and the other network elements in the SCN.

Redundancy: n+1

CCSU in DC3C-B cartridge


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Exchange Terminal- ET16 & ETS2

Function:The ET performs the electrical

synchronization and adaptation of an

external TDM line. It is able to do theHDB3/AMI/B8ZS coding and decoding,

insert the alarm bits in the outgoing

direction, and produce the PCM frame

structure.

ET16: provides 16 E1 interfaces

ETS2: provides 2 STM-1 interfaces

Redundancy: n ETS2 & ET16 in GTIC

cartridge

ETS2 ET16


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Special Units in MSSu

Channel Associated Signalling Unit (CASU)

Primary Rate Access Unit (PAU)

Multi Frequency Signalling Unit (MFSU)

Echo cancelling and exchange terminal (ECET)

Compact Data Service Unit (CDSU)


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Channel Associated Signalling Unit (CASU)

Function:The CASU is installed in the

network element only when Channel

Associated Signalling (CAS) is neededbetween the Transit MSCi and the PSTN.

Redundancy: n+1

CASU in a CC3C-A cartridge


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Primary Rate Access Unit (PAU)

Function:The PAU performs the call control

and signalling for the traffic of the ISDN

PABX connected to DX 200 system.

Redundancy: n+1

PAU in a CC3C-A cartridge


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Multi Frequency Signalling Unit (MFSU)

Function:

handles the receipt and transmission of R2

or ANSI MF signals (the main control unit is

CASU).

continuity checking, conference call control

and identification of push-button dialling.

Redundancy: n+1/L

MFSU in CC3C-A cartridge


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Echo Cancelling and Exchange Terminal (ECET)

Function: The ET with echo canceller

is used for terminating TDM lines

connected directly to Integrated MSS

or Integrated GCS from PSTN or PBX.

Redundancy: n

EC2ET plug-in units in an

ET4C-B / ET4C-A cartridge


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Compact Data Service Unit (CDSU)

Function: The main task of the CDSU

is to adapt the data connection of the

terminal device (i.e. laptop PC) of the

GSM Mobile Station (MS) to PSTN or

ISDN.

Redundancy: n

CDSU General Pool in a DS1C-B/DS1C-A cartridge


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Redundancy

2NVLRU

2NSWU

2NSTU

N+1SIGU

N+1SCPU

N+1PAU

2NOMU

2NMB

2NINDU

NET

2NEMB

2NCMU

2NCMM

2NCM

2NCHU

N+1CCSU

2NCCMU

N+1BSU

NBDCU

RedundancyUnit


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Capacity in M14

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02 02 Cn34012en32gln2 Msc Server