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© Nokia Networks Oy
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3G Core Network
Nokia MSC Server and Gateway Control Server
Training Document
Nokia MSC Server and Gateway Control Server
2 (47) © Nokia Networks Oy
The information in this document is subject to change without notice and describes only the product defined in the introduction of this documentation. This document is intended for the use of Nokia Networks' customers only for the purposes of the agreement under which the document is submitted, and no part of it may be reproduced or transmitted in any form or means without the prior written permission of Nokia Networks. The document has been prepared to be used by professional and properly trained personnel, and the customer assumes full responsibility when using it. Nokia Networks welcomes customer comments as part of the process of continuous development and improvement of the documentation.
The information or statements given in this document concerning the suitability, capacity, or performance of the mentioned hardware or software products cannot be considered binding but shall be defined in the agreement made between Nokia Networks and the customer. However, Nokia Networks has made all reasonable efforts to ensure that the instructions contained in the document are adequate and free of material errors and omissions. Nokia Networks will, if necessary, explain issues which may not be covered by the document.
Nokia Networks' liability for any errors in the document is limited to the documentary correction of errors. Nokia Networks WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENT OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL (INCLUDING MONETARY LOSSES), that might arise from the use of this document or the information in it.
This document and the product it describes are considered protected by copyright according to the applicable laws.
NOKIA logo is a registered trademark of Nokia Corporation.
Other product names mentioned in this document may be trademarks of their respective companies, and they are mentioned for identification purposes only.
Copyright © Nokia Networks Oy 2005. All rights reserved.
Contents
© Nokia Networks Oy
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Contents
1 OBJECTIVES ................................................................................................................................4
2 INTRODUCTION..........................................................................................................................5
2.1 MSC SERVER (MSS) ................................................................................................................5 2.2 MSC SERVER (MSSU)..............................................................................................................5 2.3 GATEWAY CONTROL SERVER (GCS) .......................................................................................6 2.4 INTEGRATED MSS ....................................................................................................................7 2.5 INTEGRATED GCS ....................................................................................................................7
3 CABINET TYPES..........................................................................................................................9
3.1 MSS & GCS CABINET TYPES...................................................................................................9 3.2 MSSU CABINET TYPES...........................................................................................................12
4 FUNCTIONAL UNITS................................................................................................................13
4.1 IPCF CABINET ........................................................................................................................13 4.2 IPCG CABINET .......................................................................................................................26 4.3 IPCH CABINET .......................................................................................................................31 4.4 SOME SPECIAL UNITS IN MSSU .............................................................................................36
5 REDUNDANCY ...........................................................................................................................44
6 GLOSSARY..................................................................................................................................45
Nokia MSC Server and Gateway Control Server
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1 Objectives
After completing this module, the student should be able to:
• List the main functions of the MSS, MSSu and GCS
• Explain the main functions of each functional unit.
• List the redundancy principles for the units in MSS, MSSu and GCS.
• Explain the main difference between the standalone MSS and integrated
MSS.
Introduction
© Nokia Networks Oy
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2 Introduction
All MSC Server products are based on Nokia DX 200 hardware, which uses Intel
Pentium processors. The Integrated MSC Server is a feature in the MSCi. Thus the
HW configuration is similar to the MSCi as well. This ensures an easy and cost-
efficient upgrade for the existing MSCi elements to Integrated MSC Servers. The
standalone MSC Server is based on the DX 200 Server Platform. DX 200 Server
Platform is a new HW configuration optimised for call control. It is a pure server
configuration that utilises double computer cartridges. This minimises the floor space
requirement and maximises performance. However, all plug in units are the same as in
the DX 200 MSCi, so it also offers full synergy with other DX 200 elements.
Exact specifications for the interfaces between the modules make it possible to add
new functions without changing the system architecture and enable the system’s
remaining up-to-date throughout its long operational life.
The possibility to build different network elements, which provide different
functionalities, is a good example of the versatility of the HW architecture.
2.1 MSC Server (MSS)
The MSS is a compact standalone server product that offers processing power that is
needed when one server controls several MGWs.
Basically the MSS does not have Group Switch for switching 64 kbit/s TDM channels
but an optional small GSW can be included in the configuration if required for TDM
based SS7 signalling.
2.2 MSC Server (MSSu)
Similar to the MSS, the MSSu is also a compact standalone server product that offers
processing power that is needed when one server controls several MGWs.
The MSSu will not be a new delivery but instead it will always be upgraded from the
operator’s current MSCi.
In essence, the MSSu is a pure standalone server that does not have any TDM
interfaces.
Nokia MSC Server and Gateway Control Server
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X.25
Ext.Sync.
E1 or T1
IPControl LAN Switch
GSW
IP
CMU STU CHU OMUVLRU
O&M LAN Switch
VDU and LPT
MESSAGE BUS
SIGU BSU CCSU CMM BDCU
BSU and VLRU are partof the MSS and MSSu configuration and not furnished in GCS configuration.
Optional in MSS and GCS(not in MSSu)
ET
CLS
Figure 1 Block diagram of MSS and GCS
2.3 Gateway Control Server (GCS)
Presented in Figure 1 above is the block diagram of the GCS. It shows the interfaces
between the functional units and also the interfaces connecting the system to the
environment. A more detailed description of the functionality each unit performs is
given below in section Functional Units.
Note that GCS does not have following units:
Introduction
© Nokia Networks Oy
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• Base Station Signalling Units (BSU) is not furnished because the GCS does
not handle signalling or control traffic towards radio networks. These units
are available in MSS.
• Visitor Location Register Units (VLRU) is not furnished in the GCS because
subscriber information is handled in the visited MSS where these units are
available.
2.4 Integrated MSS
As a regular MSC can be upgraded to the Integrated MSS it can be seen that block
diagram of Integrated MSS includes all the functional units available also in a regular
MSC. Naturally here the GSW is included since this network element can also handle
user and control plane traffic on TDM lines.
2.5 Integrated GCS
The basic block diagram of the Integrated MSS also applies to the Integrated GCS
with the following exceptions:
• Base Station Signalling Units (BSU) is not furnished because the Integrated
GCS does not handle signalling or control traffic towards radio networks.
• Compact Data Service Units (CDSU) are not furnished because the Integrated
GCS does not need analogue/digital modem pool as the CS Data Interworking
Functionality is handled in the Integrated MSS or in a separate Nokia Circuit
Switched Data Server (CDS) network element.
• Visitor Location Register Units (VLRU) is not furnished in the Integrated
GCS because the subscriber information is stored in the visited MSS or the
MSC.
Note: In this document, we are focus on MSS, MSSu & GCS.
Nokia MSC Server and Gateway Control Server
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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.
Figure 2. Block Diagram of Integrated MSS and Integrated GCS
Cabinet Types
© Nokia Networks Oy
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3 Cabinet Types
3.1 MSS & GCS Cabinet Types
The MSC or GCS Server has three cabinet types:
• IP Cabinet F (IPCF)
• IP Cabinet G (IPCG)
• IP Cabinet H (IPCH) (Optional)
All cabinets must be installed in a fixed order side by side in a single row. It is
possible to install cabinets from left to right as shown in the illustration below or the
mirror image of it from right to left.
With base module, IPCF and IPCG0 cabinets are delivered with CMU, CMM, OMU
and CLSU units. CLBU units and LAN switches are part of each cabinets standard
configuration. To be fully operational network element, base module must be
completed with additional functional units. The minimum configuration of the MSC
Server is summarised in the table below.
Table 1 Minimum configuration (M13)
MSS Base Module 1 pcs
BSU, CP816-A/512MB 3 pcs
CHU pair, CP816-A/512MB, HDU, FDU 1 pcs
SIGU, CP816-A/512MB 3 pcs
STU pair, CP816-A/512MB 1 pcs
VLRU pair, CP816-A/512MB 1 pcs
When the two base module cabinets are configured full, the capacity can be expanded
by adding more IPCG cabinets and functional units. The use of IPCH cabinet is
optional. When used, the IPCH cabinet must be at the either end of the row. Group
Switch and CLBU are part of the standard IPCH configuration. The number of
CCSU/CASU and ET must be dimensioned case by case according to the customer's
needs.
Nokia MSC Server and Gateway Control Server
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Figure 3 MSS floor layout
Cabinet Types
© Nokia Networks Oy
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Figure 4 GCS floor layout
Nokia MSC Server and Gateway Control Server
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3.2 MSSu Cabinet Types
The MSSu features the following cabinet types:
• Main Operation and Maintenance Cabinet (MOMC)
• Visitor Location Register Cabinet (VLRC)
The MSSu floor layout is always a one-row solution.
Figure 5 The MSSu floor layout
Functional Units
© Nokia Networks Oy
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4 Functional Units
4.1 IPCF Cabinet
Figure 6 Functional unit and cartridge positions in the IPCF cabinet in the MSS
Nokia MSC Server and Gateway Control Server
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Figure 7 Functional unit and cartridge positions in the IPCF cabinet in the GCS
Functional Units
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4.1.1 Central Memory and Marker (CMM)
The CMM contains the functionality of Central Memory, Marker and Common
Channel Signalling Management Unit in the same functional unit. The MSC
Server contains two CMMs, which are located in the IPCF cabinet. The CMM
equipment is installed in a CC4C-A cartridge.
Figure 8 CMM in CC4C-A cartridge
Table 2 Plug-in units in CMM
Position ID Name Notes
F01 C105075/C08953 PSC6-/PSC6-A Power Supply for Cartridge
F02 C105007/C08951 AS7-C (M13) / AS7-A LAPD for clock control
F03 C104095 SHIM4T Empty Slot
F04 C08947 SWCOP-A Switch Control Processor (optional) Only if IPCH cabinet in use.
F05 C74990/C74920 MBIF-C (M13)/MBIF-B
F06 C74990/C74920 MBIF-C (M13)/MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not interchangeable
C108488/C101180 CP816-A (M13) / CP710-A Pentium M Dothan processor with maximum of 1.8 GHz
frequency / Pentium®III with 800 MHz frequency
F07
C109053/C103757 MRD512A (M13)/ MR512M 512M memory
4.1.2 Cellular Management Unit (CMU)
The CMU controls the cellular radio network. The MSC Server contains two
CMUs in IPCF cabinet. They are installed in DC3C-A cartridges.
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Figure 9 CMU in DC3C-A cartridge
Table 3 Plug-in units in CMU
Position ID Name Notes
F06 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F07 C74990/C74920 MBIF-C (M13) /MBIF-B
F08 C74990/ C74920 MBIF-C (M13) /MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not interchangeable
C108488 / C101180 CP816-A (M13) / CP710-A Pentium M Dothan processor with maximum of 1.8 GHz
frequency / Pentium®III with 800 MHz frequency
F09
C109053 / C103757 MRD512A (M13) / MR512M 512M memory
4.1.3 Statistical Unit (STU)
The STU collects raw traffic measurements, supervises the load of the
exchange, maintains various counters and produces statistical reports. Primarily
statistical reports are sent to IP network via OMU functional unit and FTP
protocol. Only OLCM reports and fraud reporting are transported using
redundant LAN interface available in STU. STU pair equipment is installed into
DC3C-A cartridges in IPCF cabinet. MSC Server can have only one STU pair.
Functional Units
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Figure 10 STU in DC3C-A cartridge
Table 4 Plug-in units in STU
Position ID Name Notes
F01 C105075 / C08953 PSC6-B /PSC6-A Power Supply for Cartridge
F02 C74990/ C74920 MBIF-C (M13) / MBIF-B
F03 C74990/C74920 MBIF-C (M13) /MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not interchangeable
F04 C108488/C101180 CP816-A (M13) /CP710-A Pentium M Dothan processor with maximum of 1.8
GHz frequency / Pentium®III with 800 MHz frequency
C109053/C103757 MRD512A (M13) / MR512M 512M memory
4.1.4 Charging Unit (CHU)
The CHU Collects charging data maintains various counters and produces
detailed charging records. The CHU can send charging data directly from its
redundant LAN interface to Billing Centre using FTP over TCP/IP. CHU pair
equipment is installed into CC4C-A cartridges in all MSC Server cabinets.
Maximum number of CHU pairs is three.
Nokia MSC Server and Gateway Control Server
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Figure 11 CHU pair and mass memory in CC4C-A cartridges
Table 5 Table: Plug-in units in CHU
Position ID Name Notes
F01 C105075 /C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C104095 SHIM4T
F03 C104095 SHIM4T
F04 C104095 SHIM4T
Empty Slots
F05 C74990/C104965/C
74920
MBIF-C (M13)/MBIF-CR (M13)
/MBIF-B
F06 C74990/C104965/C
74920
MBIF-C (M13)/MBIF-CR (M13)
/MBIF-B
MBIF-CR: Message bus plug-in unit with a
repeater function
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not
interchangeable
F07 C108488 / C101180 CP816-A (M13)/ CP710-A Pentium M Dothan processor with maximum of
1.8 GHz frequency / Pentium®III with 800 MHz
frequency
C109053 / C103757 MRD512A (M13)/ MR512M 512M memory
Note:
• IPCF cabinet: in CHU 0-0 MBIF-CR, in CHU 0-1 MBIF-C
• IPCG cabinets: in CHUs 1-0, 2-0 and 3-0 MBIF-CR, in CHUs 1-1, 2-1
and 3-1 MBIF-C
Functional Units
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Table 6 Plug-in units in CHU mass memory
Position ID Name Notes
F01 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C100720 HDPU-A Hard disk adapter
F02 P01098 / P01096 / P01091 WDW73 / WDW36 / WDW18-S Hard disk unit
F04 C101810 ODPU-A Magneto Optic disk adapter
F04 P1090 MO91 Magneto Optical unit
F07 C102646 COP10T Empty Slots
4.1.5 Operation and Maintenance Unit (OMU)
The OMU handles all centralised supervision, alarm and recovery functions,
and the connections towards user interface (MMI-System). Primarily the
connections are made using IP network but V.24 interface is also available.
The OMU collects the wired alarms from the exchange as well as from the
external equipment connected to the system.
The OMU has dedicated storage devices, which serve as a storage, for example,
for the entire system software of the network element as well as for the event
buffer for intermediate storing of alarms.
The OMU provides:
• Telnet connection for MMI
• FTP and Nokia specific EMT connection to NEMU for NEMU
applications
• HTTP connections to NetAct for delivering alarms in XML format
The MSC Server contains one OMU pair and it is located in the IPCF cabinet.
The OMU equipment is installed in a CC4C-A cartridge. The OMU unit
includes also a mass memory units.
Nokia MSC Server and Gateway Control Server
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Figure 12 OMU pair and mass memory in CC4C-A cartridges
Table 7 Plug-in units in OMU
Position ID Name Notes
F01 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C104095 SHIM4T Empty Slots
F03 C08949 SERO-A Serial Interface
F04 C08950 HWAT-A Hardware Alarm Terminal
F05 C74990/ C74920 MBIF-C (M13)/ MBIF-B
F06 C74990/C74920 MBIF-C (M13) /MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not interchangeable
F07 C108488 / C101180 CP816-A (M13) / CP710-A Pentium M Dothan processor with maximum of 1.8
GHz frequency / Pentium®III with 800 MHz frequency
C109053 / C103757 MRD512A (M13) /
MR512M
512M memory
Table 8 Plug-in units in Mass memory SD0
Position ID Name Notes
F01 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C100720 HDPU-A Hard disk adapter
F02 P01098 / P01096 / P01091 WDW73 / WDW36 / WDW18-S Hard disk unit
Functional Units
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Position ID Name Notes
F04 C101810 ODPU-A Magneto Optic disk adapter
F04 P1090 MO91 Magneto Optical unit
F07 C102646 COP10T Empty Slots
Table 9 Plug-in units in Mass memory SD1
Position ID Name Notes
F01 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C100720 HDPU-A Hard disk adapter
F02 P01098 / P01096 /P01091 / WDW73 /WDW36 / WDW18-S Hard disk unit
F04 C105324 D4PU-A Dummy Plug-in Unit
F05 C104095 SHIM4T
F06 C104095 SHIM4T
F07 C102646 COP10T
Empty Slots
4.1.6 Basic Data Communication Unit (BDCU)
The BDCU provides the following external connections:
• Traffic is always connected using BDCU.
• The BDCU provides network interfaces for OSI (FTAM) protocol based
O&M connections, when they are required.
• The BDCU provides SMRSE/TCP/IP connection to SMSC (X.25 is also
available).
The BDCU equipment is installed in CC4C-A cartridge. Maximum number of
BDCUs in one network element is two.
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Figure 13 BDCU in CC4C-A cartridge
Table 10 Plug-in units in BDCU
Position ID Name Notes
F01 C105075 /C08953 PSC6-B /PSC6-A Power Supply for Cartridge
F02 C105007/C08951/C08944 AS7-C (M13) /AS7-A/AC25-A
F03 C105007/C08951/C08944 AS7-C (M13)/AS7-A /AC25-A
F04 C105007/C08951/C08944 AS7-C (M13)/AS7-A/AC25-A
X25 terminals
Optional, see note!
F05 C74990/C74920 MBIF-C (M13)/MBIF-B
F06 C74990/C74920 MBIF-C (M13)/MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not
interchangeable
F07 C108488 /C101180 CP816-A (M13)/CP710-A Pentium M Dothan processor with maximum of
1.8 GHz frequency / Pentium®III with 800 MHz
frequency
C109053 /C103757 MRD512A (M13) /MR512M 512M memory
Note:
• If slots F02–F04 are not equipped, SHIM4T cover plates should be
installed on these slots.
• Digital G.703 interface AS7-C/-A can be used only if MSC Server has
IPCH cabinet.
Functional Units
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4.1.7 Clock System (CLS)
Both CLBU (Clock and Alarm Buffer Unit) and CLSU (Clock System Unit) are
part of the Clock System (CLS).
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.
The CLSU generates the clock and synchronization signals and transmits them
further to the CLBU units in the other cabinets.
In the integrated models synchronization signal is received from external TDM
lines or from external synchronization interface in CLS.
In the standalone models without external TDM connections there is a need to
receive external synchronization signal via external synchronization interface in
CLS. This external synchronization signal is needed to ensure the accuracy of
charging and also to ensure that timestamp information in charging data and
performance data from different network elements are comparable.
The MSC Server contains one duplicated CLSU which is located in the IPCF
cabinet and three CLBUs, one in IPCF and two in IPCG0 cabinet. The CLSU
equipment is installed in the same CLOC-B cartridge. The CLBU equipment is
installed into CLAC-B cartridge.
Figure 14 CLSU in a CLOC-B cartridge & CLBU in a CLAC-B cartridge
Table 11 Plug-in units in CLSU
Position ID Name Notes
F00 C08825 CL2TG-S
F03 C08825 CL2TG-S
Clock and Tone
Generator
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Table 12 Plug-in units in CLBU
Position ID Name Notes
F01 -- --
F02 -- --
F03 C08839 CLAB-S
F04 C08839 CLAB-S
Clock and Alarm Buffer
4.1.8 Switching Unit (SWU)
The SWU uses ESB20-A , which is a 20-port 10/100 BaseT/TX Ethernet LAN
Switch plug-in unit integrated into the Nokia network elements. It has an
extensive set of features such as VLAN 802.1q, Rapid Spanning Tree Protocol
802.1d (RSTP) and an SNMP agent. A set of LAN switches, integrated in the
Nokia MSC Server cabinets, provide a manageable amount of LAN interfaces
from the network element to external routers at the site. The separation of
different traffic types provides additional security and manageability.
In the MSS and GCS the ESB20-A LAN switch plug-in unit is furnished in a
separate SWU unit whereas in the integrated models and in the MSSu the
ESB20-A is furnished in STU or CHU units.
Figure 15 LAN in LASWC-A cartridge in MSS
Functional Units
© Nokia Networks Oy
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Table 13 LAN switch position in MSS cartridge
Position ID Name Notes
F01 C8862 PSC6 Power supply for cartridge
F02 C108885 / C108000 ESB26 / ESB20-A See Notes
F03 C108885 / C108000 ESB26 / ESB20-A IPCF cabinet
F04 C104095 SHIM4T
F05 C104095 SHIM4T
Empty Slots
Notes:
• ESB26:LAN switch unit (2 optical Gbit/s, 2 electrical Gbit/s and 2 100
Mbit/s electrical uplinks; 20 100 Mbit/s electrical downlinks)
• ESB20: LAN switch unit (2 electrical uplink and 18 downlink 10/100
Mbit/s ports)
Figure 16 LAN in LASWC-A cartridge in GCS
Table 14 LAN switch position in GCS cartridge
Position ID Name Notes
F01 C105075 / C08953 PSC6-B / PSC6-A Power supply for cartridge
F02 C108885 / C108000 ESB26 / ESB20-A See Notes
F03 C108885 / C108000 ESB26 /ESB20-A See Notes
F04 C104095 SHIM4T Empty slots
F05 C108885 / C108000 ESB26 /ESB20-A See notes
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4.2 IPCG Cabinet
Note: *SU configurable as BSU or SIGU.
Figure 17 Functional unit and cartridge positions in the IPCG 0 cabinet in MSS
The following figure shows the functional unit and cartridge configuration of
the IPCG 0 cabinet in the GCS network element.
Functional Units
© Nokia Networks Oy
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Figure 18 Functional unit and cartridge positions in the IPCG 0 cabinet in GCS
4.2.1 Signalling Unit (SIGU)
The SIGU has the functionality of the CCSU (see above) except that the SIGU
can utilise only an IP-based signalling network, whereas the CCSU can use an
IP or a TDM-based SS7 network.
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SIGUs are installed to IPCG cabinets and maximum number of SIGUs is 14
pcs. The SIGU configuration is:
Figure 19 SIGU in DC3C-A cartridge
Table 15 Plug-in units in SIGU
Position ID Name Notes
F01 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C74990/C74920 MBIF-C(M13) /MBIF-B
F03 C74990/ C74920 MBIF-C(M13) /MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not interchangeable
C108488 / C101180 CP816-A(M13) / CP710-A Pentium M Dothan processor with maximum of 1.8 GHz
frequency / Pentium®III with 800 MHz frequency
F04
C109053 / C103757 MRD512A(M13) / MR512M 512M memory
4.2.2 Base Station Signalling Unit (BSU)
The BSU provides BSSAP and RANAP protocols that perform the signalling
functions between radio networks and MSS. The BSU has SIGTRAN
functionality and a LAN interface which enable it to use IP for conveying
signalling messages. If the A-interface is connected directly to the Integrated
MSS, then the BSU also controls the TDM lines linked to the GERAN. The
BSU equipment is installed into DC3C-A cartridge. Maximum number of BSUs
in one MSC Server is 14 pcs. The BSU configuration is:
Functional Units
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Figure 20 BSU in a DC3C-A cartridge
Table 16 Plug-in units in BSU
Position ID Name Notes
F06 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F07 C74990/C74920 MBIF-C (M13) /MBIF-B
F08 C74990/ C74920 MBIF-C(M13) /MBIF-B
Arbitration frequency: 2,048 MHz.
MBIF-B & MBIF-C/CR is not interchangeable
C108488 / C101180 CP816-A(M13) / CP710-A Pentium M Dothan processor with maximum of 1.8 GHz
frequency / Pentium®III with 800 MHz frequency
F09
C109053 / C103757 MRD512A(M13) / MR512M 512M memory
4.2.3 Visitor Location Register Unit (VLRU)
The VLRU contains information of each subscriber currently served by the
MSC Server. The MSS can contain up to 8 VLRU pairs each containing a
database for up to 75,000 subscribers and 25,000 telemetric subscribers, hence
allowing a total of 600,000 + 200,000 subscribers per MSS.
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VLRU pair equipment is installed into DC3C-A cartridges in IPCF and IPCG
cabinets. MSC Server can have a maximum of 8 VLRU pairs. Due to
redundancy reasons, each pair's halves are installed to separate cartridges . :
Figure 21 VLRU pair in DC3C-A cartridges
Table 17 Plug-in units in cartridges reserved for VLRUs
Position ID Name Notes
F01 C105075/ C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F02 C74990/C74920 MBIF-C(M13) /MBIF-B
F03 C74990/ C74920 MBIF-C(M13) /MBIF-B
Arbitration frequency: 2,048 MHz.;
MBIF-B & MBIF-C/CR is not interchangeable
F04
C108488/C101180 CP816-A(M13) / CP710-A Pentium M Dothan processor with maximum of 1.8
GHz frequency / Pentium®III with 800 MHz frequency
C109053/C103757 MRD512A(M13) / MR512M 512M memory
F06 C105075 / C08953 PSC6-B / PSC6-A Power Supply for Cartridge
F07 C74990/C74920 MBIF-C(M13) /MBIF-B
F08 C74990/ C74920 MBIF-C(M13) /MBIF-B
Arbitration frequency: 2,048 MHz.;
MBIF-B & MBIF-C/CR is not interchangeable
F09
C108488 / C101180
CP816-A(M13) / CP710-A Pentium M Dothan processor with maximum of 1.8 GHz frequency / Pentium®III with 800 MHz frequency
C109053 /
C103757
MRD512A(M13) / MR512M 512M memory
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4.3 IPCH Cabinet
Figure 22 Functional unit and cartridge positions in the IPCH cabinet
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4.3.1 Common Channel Signalling Unit (CCSU)
The CCSU performs the MAP, TCAP, SCCP and ISUP signalling. CCSU
performs core INAP and CAP signalling needed in order to provide IN and
CAMEL services. For TDM based SS7 connections CCSU takes care of the
decentralised MTP functions of the SS7 signalling system, the handling of
signalling messages, and the functions related to the management of the
signalling channel. One CCSU can support 64 TDM lines.
The CCSU also contains SIGTRAN, which enables to convey the above-
mentioned signalling messages on top of IP using LAN interfaces available in
this functional unit.
In addition, the CCSU provides H.248, SIP and BICC signalling. The CCSU is
used in integrated models because of its ability to also handle TDM-based SS7.
In the standalone models SIGU is used instead to handle signalling using
SIGTRAN and CCSU is used in standalone models only in the optional IPCH
cabinet.
CCSUs can be installed into IPCH cabinet only. Maximum number of CCSUs is
10 pcs. The CCSU configuration is:
Figure 23 CCSU in CC4C-A cartridge
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Table 18 Plug-in units in CCSU
Position ID Name Notes
F01 C105075/C08953 PSC6-B /PSC6-A Power Supply for Cartridge
F02 C105007/C08951 AS7-C(M13)/AS7-A
F03 C105007/C08951 AS7-C (M13)/AS7-A
F04 C105007/C08951 AS7-C (M13)/AS7-A
CCS7 terminals
F05 C74990/C104965/C74920 MBIF-C(M13)/MBIF-CR
( M13)/MBIF-B
In CCSU 0 MBIF-CR
In CCSU 1 MBIF-C
Not interchangeable
F06 C74990/C104965/C74920 MBIF-C(M13)/MBIF-CR
( M13)/MBIF-B
In CCSU 1 MBIF-CR
In CCSU 0 MBIF-C
Not interchangeable
F07 C108488 /C101180 CP816-A (M13)/CP710-A Pentium M Dothan processor with maximum of
1.8 GHz frequency / Pentium®III with 800
MHz frequency
C109053 /C103757 MRD512A(M13)/MR512M 512M memory
4.3.2 Group Switch (GSW)
If there are TDM trunks connected directly to the MSC Server it is necessary to
have a switching fabric. The GSW is an option in the standalone models (not in
the MSSu). If the operator needs to have a direct TDM-based SS7 connection
from a standalone model, it is possible to include the optional GSW which has a
capacity of 256 TDMs. The Group switch equipment is housed in two SW1C-B
cartridges
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Figure 24 GSW in SW1C-B cartridge
Table 19 Plug-in units in GSW
Position ID Name Notes
F00 -- --
F01 C08853 SWCSM-S Switch Control and
Switching Memory Unit
F02 C08854 SWSPS-S
F03 C08854 SWSPS-S
F04 C08854 SWSPS-S
F05 C08854 SWSPS-S
Switch Serial-Parallel-
Serial Converter
F06 C08869 PSC1-S Power supply
4.3.3 Exchange terminal (ET)
The ET performs the electrical synchronization and adaptation of an external
TDM line. It is able to do the HDB3/AMI/B8ZS coding and decoding, insert the
alarm bits in the outgoing direction, and produce the PCM frame structure. In
the MSS the ET is furnished in the optional IPCH cabinet.
Three alternative ET types without echo cancelling are available:
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Connecter Type M12 M3
E1 Euro ET2E-S ET2E-T
E1 Coax ET2E-SC ET2E-TC
T1 RJ-45 ET2A ET2A-T
Only one ET type can be used in one network element. ET plug-in units are
installed in ET4C-B or ET5C-B cartridges in the IPCH cabinet. ET4C-B
cartridge can contain up to 32 ET plug-in units. ET5C-B has room for eight ET
plug-in units. The recommended order of installing ET plug-in units is
described below but they can be added in any desired order too.
Figure 25 ET plug-in units in ET4C-B & ET5C-B cartridge
The following example shows how five ET plug-in units are installed into the
cartridge. Please note that the numbers shown in this picture's plug-in units
indicates only the order how plug-in units are added to the cartridge.
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Figure 26 Example of ET configuration
When plug-in units are added later to ET cartridges, the ET plug-in unit is
installed to the first available slot using the same principle as described above.
4.4 Some Special Units in MSSu
4.4.1 Channel Associated Signalling Unit (CASU)
The CASU is installed in the network element only when Channel Associated
Signalling (CAS) is needed between the Transit MSCi and the PSTN. In the i-
series MSCs, the MFSU handles the transmission and receipt of MF signals,
while CASU takes care of the related CAS line signalling functions. If CASUs
are needed in the network element, the required minimum number is two. The
maximum number of CASUs, CCSUs, PAUs and TGSUs is 33, including a
spare unit of each type for n+1 redundancy.
4.4.2 Primary Rate Access Unit
The Primary Rate Access Unit (PAU) performs the call control and signalling
for the traffic of the ISDN PABX connected to DX 200 system by a 30B+D
interface. Of the signalling, the PAU performs the functions of levels 2 and 3 in
the seven-layer OSI model. Level 2 is generated by a LAPD (Link Access
Procedure on the D-channel) in accordance with the ITU-T Recommendations
Q920, Q921 and Q922. Level 3 is generated by the signalling network functions
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in accordance with the ITU-T Recommendation Q931. The PAU also
supervises the trunk circuits of the PABXs based on the information on the error
ratio and synchronisation of the transmission obtained from the trunk circuit
interfaces.
Two alternative protocols are available for the PBX signalling: ISDN primary
rate access 30B+D, and DPNSS 1. One PAU can handle up to 64 signalling
links and control up to 64 2 Mbit/s lines.
The basic configuration of a signalling unit includes:
• one Central Processing Unit (CPU) with memory
• two Message Bus Interfaces (MBIF)
• one AS7 pre-processor units to handle ET supervision (AS7 0).
• up to three AS7 pre-processor units to handle CAS, CCS7, LAPD and
PBX Signalling interfaces (AS7 1/2/3).
• one Power Supply (PSC6).
Figure 27 CASU, PAU or CCSU equipment in a CC3C-A cartridge.
4.4.3 Mechanical structure of MFSU(i)
The MFSU is installed in the CC4C-A or the CC3C-A cartridge (see the figures
below), and the basic configuration includes:
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Configuration of the MFSU in the CC4C-A cartridge
• one Central Processing Unit (CPU) with memory
• two Message Bus Interfaces (MBIF)
• up to four Multifrequency Signalling Terminal units (MFSTs)
• one Power Supply for Cartridge (PSC6)
Configuration of the MFSU in the CC3C-A cartridge
• one Central Processing Unit (CPU) with memory
• two Message Bus Interfaces (MBIF)
• up to four Multifrequency Signalling Terminal units (MFSTs)
• one Power Supply for Cartridge (PSC6)
Figure 28 Configuration of the MFSU in the CC4C-A cartridge
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Figure 29 Configuration of the MFSU in the CC3C-A cartridge
4.4.4 Group Switch (GSW)
If there are TDM trunks connected directly to the MSC Server it is necessary to
have a switching fabric. The maximum capacity of the GSW in the integrated
models is 2048 TDMs.
The SW2C-B/A cartridge contains 2 power supply units PSC1-S, 1...8 SWSPS-
S plug-in units and 1...16 SWCSM-S plug-in units. The GSW of the MSCi and
Transit MSCi is equipped for the capacity of 2048 x 2048 PCMs and in
maximum configuration occupies four SW2C-B/A cartridges.The figure below
shows the placement of the plug-in units in the cartridge and the table that
follows indicates the number of cartridges and plug-in units needed as a
function of the number of PCM circuits.
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Figure 30 Configuration of the SW2C-B/A cartridge
Table 20 Number of SW2C-B/A cartridges and plug-in units needed as a function of the number of PCM circuits.
Cartridge Plug-in units
PCM circuits SW2C SWSPS SWCSM PSC1
32 1 1 1 1
128 1 2 1 1
512 1 8 4 2
513 2 9 9 3
1 024 2 16 16 4
1 025 3 17 25 5
1 536 3 24 36 9
2 048 4 32 64 12
4.4.5 Echo cancelling and exchange terminal (ECET)
The ET with echo canceller is used for terminating TDM lines connected
directly to Integrated MSS or Integrated GCS from PSTN or PBX. One EC2ET,
EC2ET-C or EC2ET-A plug-in unit contains two ET functional units and two
Echo Canceller units. The ECETs are housed in ET4C-B / ET4C-A cartridges
positioned in ETC cabinets. One ET4C-B / ET4C-A cartridge can contain up to
16 EC2ET, EC2ET-C or EC2ET-A plug-in units.
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Figure 31 EC2ET Echo Canceller Exchange Terminal plug-in units in an ET4C-B / ET4C-A cartridge.
The cartridge on the second-lowest shelf at the right-hand side in the ETC
cabinet has a mixed configuration, with ECETs on the upper shelf and ETs on
the lower, as shown in the figure below.
Figure 32 EC2ET and ET2E plug-in units in an ET4C-B / ET4C-A cartridge.
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4.4.6 Compact Data Service Unit (CDSU)
The CDSU implements the Inter Working Function (IWF) of the MSCi, CDS,
and Compact MSCi and CDS. A G.703 connection is used. The main task of the
unit is to adapt the data connection of the terminal device (i.e. laptop PC) of the
GSM Mobile Station (MS) to the:
• Public Switched Telephone Network (PSTN)
• Integrated Services Digital Network (ISDN)
The tasks of the CDSU include:
• Rate Adaption (RA)
• Radio Link Protocol (RLP) processing
• Layer 2 interface (L2R)
• Modem state control.
The CDSU offers the following GSM data services:
• Asynchronous bearer services
• Transparent synchronous bearer services
• Transparent facsimile group 3 tele-service.
The Data Service Cartridge (DS1C-B/A) is 1/3 shelf wide. It is a cartridge for
DX 200 hardware and its physical dimensions are: 240 mm(width) x 262
mm(height) x 300 mm (depth).
In its maximum configuration, the DS1C-B/A cartridge can contain 10 plug-in
units:
• one PSC6 plug-in unit (power supply)
• one DSCO plug-in unit (control unit)
• eight DSMA-S plug-in units
The equipping of the cartridge depends on the application. There are three
options for the CDSU:
• a Normal Speed Data Service Unit with Data Interface, NDSD Pool, or
an UDI Pool
• a Normal Speed Data Service Unit with Modems, NDSM Pool, or a
Modem Pool)
• a Compact Data Service Unit Pool, CDSU Pool, or a General Pool
(which combines both of the above).
The CDSU supports, when fully equipped, 32 simultaneous calls (no matter
whether the call is using single or multi-slot configuration in the air interface).
If the CDSU hardware is configured as
• NDS; it supports 32 simultaneous modem/fax calls.
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• NDSD; it supports 32 simultaneous UDI calls
• CDSU; it supports 32 simultaneous modem/fax/UDI calls.
In the NDSM and CDSU mode the use of channels is dynamic (modem, fax,
UDI), that is, the reserved channel is configured based on the received call set
up request. So, for example, the CDSU can serve simultaneously any number of
modem/fax/UDI calls (the total number of calls per CDSU is limited to 32).
Figure 33 Configuration of the plug-in units of the NDSM Modem and CDSU General pool
Figure 34 Configuration of the plug-in units of the NDSD UDI pool
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5 Redundancy
REDUNDANCY
BDCU N
BSU N+1
CASU N+1
CDSU N
CCMU 2N
CCSU N+1
CHU 2N
CM 2N
CMM 2N
CMU 2N
ESB20 2N
ET N
IPET N
M 2N
MB 2N
MFSU N+1/L
OMU 2N
PAU N+1
SIGU N+1
STU 2N
TGFP 2N
TGSU N+1
VLRU 2N
Table 21 Redundancy methods of functional units
Glossary
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6 Glossary
2G 2nd
Generation mobile phone network
3G 3rd Generation mobile phone network
3GPP Third Generation Partnership Project
AC Apply Charging
ACR ApplyChargingReport
API Application Programming Interface
APSE Application Server
AUC Authentication Centre
BSSAP Base Station Subsystem Application Part
CAMEL Customised Applications for Mobile Network Enhanced Logic
CAP CAMEL Application Part
CDR Charging Data Record
CHU Charging Unit
CM Central Memory
CMISE Common Management Information Service Element
CORBA Common Object Request Brokerage Architecture
CPS Connection Processing Server
CPU Central Processing Unit
CUE Continue
CS Circuit Switched
DCN Data Communications Network
DP Detection Point
DTMF Dual Tone Multifrequency
EDGE Enhanced Data Rates For GSM
FTP File Transfer Protocol
GCS Gateway Control Server
GERAN GSM/EDGE Radion Access Network
GPRS General Packet Radio Service
GSM Global System For Mobile Communications
GSW Group Switch
HLR Home Location Register
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HSS Home Subscriber Server
IDP Initial DP operation
IMS IP Multimedia Subsystem
IMSI International Mobile Subscriber Identification
IN Intelligent Network
INAP Intelligent Network Application Part
IP Internet Protocol
ISUP ISDN User Part
LA Location Area
M Marker
M3UA MTP3 User Adaptation
MAP Mobile Application Part
MGCF Media Gateway Control Function
MGW Multimedia Gateway
MMI Man Machine Interface
MML Man Machine Language
MS Mobile Station
MSC Mobile Switching Centre
MSS MSC Server
MSSu Upgraded MSC Server
NEMU Network Element Management Unit
O&M Operation & Maintenance
OMU Operational And Maintenance Unit
PLMN Public Land Mobile Network
PSTN Public Switched Telephone Network
PVC Permanent Virtual Connection
RAN Radio Access Network
RANAP Radio Access Network Application Part
RNC Radio Network Controller
RTP Real Time Protocol
SCP Service Control Point
SCTP Stream Control Transmission Protocol
SIGTRAN Signalling Transport
Glossary
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SIP Session Initiated Protocol
SMSC Short Message Service Centre
SPVC Soft Permanent Virtual Connection
SRR Service Routing Register
SSP Service Switching Point
SS7 Signalling System # 7
STU Statistical Unit
SVC Switched Virtual Connection
TMSI Temporary Mobile Subscriber Information
T-SGW Transport Signalling Gateway
UE User Equipment
UMTS Universal Mobile Telecommunication System
USB Universal Serial Bus
USSD Unstructured Supplementary Services Data
UTRAN UMTS Terrestrial Radio Access Network
VLR Visitor Location Register
VMSS Visited MSC Server
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