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8/12/2019 02 02 Cn34012en32gln2 Msc Server
1/45CN34012EN32GLN2
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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MSC Server, Gateway Control Server and Circuit Seitched Data
Server Architecture
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2 Nokia Siemens Networks CN34012EN32GLN2
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