nokia engineering bsc3i

Engineering for BSC3i

dn01154794Issue 3-2 en

# Nokia CorporationNokia Proprietary and Confidential

1 (96)

2003319Nokia BSC/TCSM S11 Product Documentation

The information in this documentation is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This documentation is intended for theuse of Nokia's customers only for the purposes of the agreement under which the documentationis submitted, and no part of it may be reproduced or transmitted in any form or means without theprior written permission of Nokia. The documentation has been prepared to be used byprofessional and properly trained personnel, and the customer assumes full responsibility whenusing it. Nokia welcomes customer comments as part of the process of continuous developmentand improvement of the documentation.

The information or statements given in this documentation concerning the suitability, capacity, orperformance of the mentioned hardware or software products cannot be considered binding butshall be defined in the agreement made between Nokia and the customer. However, Nokia hasmade all reasonable efforts to ensure that the instructions contained in the documentation areadequate and free of material errors and omissions. Nokia will, if necessary, explain issueswhich may not be covered by the documentation.

Nokia's liability for any errors in the documentation is limited to the documentary correction oferrors. NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THISDOCUMENTATION OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of this documentation or theinformation in it.

This documentation and the product it describes are considered protected by copyrightaccording to the applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this documentation may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Corporation 2003. All rights reserved.

2 (96) # Nokia CorporationNokia Proprietary and Confidential



Contents

Contents 3

List of tables 5

List of figures 6

Summary of changes 9

1 Overview of Engineering for BSC3i 11

2 Introducing the BSC3i 132.1 Overview of the BSC3i in GSM/EDGE mobile network 132.2 DX 200 system architecture and BSC3i block diagram 152.3 DX 200 redundancy principles 16

3 Mechanical construction of the BSC3i 193.1 BSC3i cabinet BSCC 193.2 Cartridges 223.3 Plug-in units 233.4 Cabling 26

4 BSC3i cabinet and Side Cable Conduit 274.1 BSC3i cabinet (BSCC) 274.2 Side Cable Conduit (SCC) 334.3 Dimensioning the BSC3i capacity 34

5 Introduction to the BSC3i functional unit descriptions 35

6 Base Station Controller Signalling Unit (BCSU) in the BSC3i 37

7 Clock and Synchronisation Unit (CLS) in the BSC3i 41

8 Exchange Terminal (ET) in the BSC3i 45

9 Bit Group Switch (GSWB) in the BSC3i 49

10 IP interfaces in the BSC3i 53

11 Marker and Cellular Management Unit (MCMU) in the BSC3i 61

12 Message Bus (MB) in the BSC3i 65

13 Operation and Maintenance Unit (OMU) in BSC3i 67

14 Power Distribution Fuse Unit (PDFU-A) in the BSC3i 73

15 Overview of the BSC3i installation site 7715.1 Equipment room layout 77



3 (96)

Contents

15.2 Cable structures and estimated power consumption 81

16 Alarm system for BSC 8316.1 Collection of alarms 8416.2 Alarms from the TCSM2 8516.3 BTS alarm handling in the BSC 8516.4 BSS transmission equipment handling 8616.5 Nokia NetAct network management system 8616.6 EXAU 88

17 Synchronisation for BSC 91

18 Management network topology for BSC 95




List of tables

Table 1. Plug-in units of the BCSU. 39

Table 2. Plug-in units of the CLSU 42

Table 3. The ET plug-in units 46

Table 4. Plug-in units of the GSWB in a SW1C-C cartridge 50

Table 5. Plug-in units of the MCMUhousing SWU units 55

Table 6. Plug-in units of the MCMU 62

Table 7. Plug-in units of the OMU in BCS3i, S10.5 69

Table 8. Plug-in units of the OMU, S11 70



5 (96)

List of tables

List of figures

Figure 1. BSC3i in the GSM/EDGE mobile network 14

Figure 2. Block diagram of the BSC3i 16

Figure 3. Equipment cabinet IC209-A and its components 21

Figure 4. cPCI cartridge and the cartridge shelf 23

Figure 5. Example of cPCI plug-in units CP710-A, PSC6-A, MBIF-B, AS7-B andPCU-B 25

Figure 6. The BSCC cabinet and the position of the Side Cable Conduit (SCC) 28

Figure 7. Equipping of the BSCC cabinet 30

Figure 8. Equipping Cover Plates for configuration steps one, two and three 32

Figure 9. Equipping Cover Plates for configuration steps four, five and six 33

Figure 10. Side Cable Conduit (SCC) 34

Figure 11. BCSU equipment in the CC3C-A cartridge 38

Figure 12. BCSU equipment in the CC3C-A cartridge (S11 release level) 39

Figure 13. Two Clock and Synchronisation Units (CLS) in the CLOC-B cartridge 42

Figure 14. ET equipment in the ET4C-B cartridge 46

Figure 15. GSWB equipment in the SW1C-C cartridge 50

Figure 16. The LAN connection principle in the BSC3i 54

Figure 17. LAN switches in the MCMUhousing CC4C-A cartridge 55

Figure 18. CPU LAN architecture 57

Figure 19. PCU LAN architecture 58

Figure 20. Overview of internal LAN management in BSC3i 59

Figure 21. MCMU equipment in the CC4C-A cartridge 62

Figure 22. Message bus (MB) 66

Figure 23. OMU equipment in the CM2C-A cartridge, S10.5 68

Figure 24. OMU equipment in the CM2C-A cartridge, S11 70

Figure 25. The four PDFU-A units at the top of the BSCC cabinet 74

Figure 26. Power distribution diagram of the BSCC cabinet 75

Figure 27. Power supply to the BSCC cabinet 76




Figure 28. Space requirements of the BSC3i network element 78

Figure 29. Left-to-right configuration, an example 79

Figure 30. Right-to-left configuration, an example 79

Figure 31. Left-to-right configuration (raised floor), an example 80

Figure 32. Right-to-left configuration (raised floor), an example 80

Figure 33. Implementation model of the alarm system 83

Figure 34. Block diagram of the EXAU 88

Figure 35. Synchronisation of the BSC 92

Figure 36. Nokia NetAct system interfaces (BSS includes BSC, TCSM2, transmissionequipment and BTS) 95



7 (96)

List of figures

Summary of changes

Summary of changes

Changes between document issues are cumulative. Therefore, the latest documentissue contains all changes made to previous issues.

Changes between issues 3�1 and 3

Structural changes.

Changes between issues 3 and 2

S11 update. Information about new plug-in units and integrated LAN switchesadded. Figure updates and minor editorial changes.

Changes between issues 2 and 1

Minor editorial changes made. Figure 3, Mechanical construction of the BSC3i,was updated.

Issue 1

This the first issue of DN01154794.



9 (96)

Summary of changes

1 Overview of Engineering for BSC3i

Engineering for BSC3i provides the basic information needed for the installationplanning of the Nokia GSM/EDGE BSC3i.

Note

The subjects covered do not, however, include the installation planninginstructions for the site power supply equipment or for the PCM and alarmdistribution frames.

The following items are discussed:

. Introducing the BSC3i

. Mechanical construction of the BSC3i

. BSC3i cabinet and Side Cable Conduit

. Introduction to the BSC3i functional unit descriptions

- Base Station Controller Signalling Unit (BCSU) in the BSC3i

- Clock and Synchronisation Unit (CLS) in the BSC3i

- Exchange Terminal (ET) in the BSC3i

- Bit Group Switch (GSWB) in the BSC3i

- IP interfaces in the BSC3i

- Marker and Cellular Management Unit (MCMU) in the BSC3i

- Message Bus (MB) in the BSC3i

- Operation and Maintenance Unit (OMU) in the BSC3i

- Power Distribution Fuse Unit (PDFU-A) in the BSC3i

. Overview of the BSC3i installation site

The site requirements for the BSC3i are discussed in Installation SiteRequirements for BSC and TCSM2 .



11 (96)

Overview of Engineering for BSC3i

2 Introducing the BSC3i

The following sections describe the basic functionality of the Nokia GSM/EDGEBSC3i. The emphasis is on the hardware implementation of the system.

For a general introduction, see Overview of Engineering for BSC3i

2.1 Overview of the BSC3i in GSM/EDGE mobilenetwork

The Nokia GSM /EDGE Base Station Controller (BSC3i ) is a modern faulttolerant system for GSM 800/GSM 900/GSM 1800/GSM 1900 networks. NokiaBSC3i is based on modular software and hardware architecture. The distributedarchitecture of Nokia BSC3i is implemented with a high-capacity and redundantmultiprocessor system - the DX 200 Computing Platform. The system enables thedistribution of processing capacity to several computer units with dedicated tasks.

The DX 200 Computing Platform Product Family covers a wide application areain GSM/EDGE mobile networks and fixed telephone networks. The DX 200Computing Platform product family contains products for digital mobileapplications, such as Base Station Controller (BSC ), Transcoder Submultiplexer(TCSM2 ), Mobile Switching Centre (MSC ), Home Location Register (HLR )and 2G Serving GPRS Support Node (SGSN ), and also contains fixed networkapplications.

The main function of the BSC3i is to control and manage the Base StationSubsystem (BSS ) and the radio channels. Based on Nokia's long experience incellular networks, BSC3i is designed for efficient use of radio resources and iseasy to operate and maintain. The Nokia BSC is a stable, mature and highlyreliable product. One major feature of BSC3i is its field-proven multivendorfunctionality.

Together with the functionally distributed modular architecture of the DX 200Computing Platform and the latest commercially available industry standardhardware components, the BSC3i is easily expandable and cost-efficient and hashigh capacity.



13 (96)

Introducing the BSC3i

Figure BSC3i in the GSM/EDGE mobile network shows the position of theBSC3i in the GSM/EDGE mobile network.

Figure 1. BSC3i in the GSM/EDGE mobile network

Modular structure of the BSC3i

The BSC3i is designed with a modular structure enabling a distributed processingarchitecture. This quality, combined with the wide range of both standard andoptional features available, makes it readily adaptable to the needs eachindividual operator, as it allows for capacity dimensioning according to individualneed. External costs resulting from surplus capacity are avoided, and the operatorcan choose a selection of features and services tailored to meet the demands of hiscustomers. When additional capacity or new facilities are needed, the exchangecan easily be expanded by adding new hardware and/or software modules to theexisting configuration.

2G

BTS BSC

WCDMABTS

WCDMARNC

3G

Radio Access Network Core Network

LandlineNetwork

(PSTN/ISDN)

IP

MSC

GSM mobile

WCDMAmobile

SIMcard

IN

GSM/ WCDMAmobile

TranscoderSubmultiplexer

3G SGSN

HLR

2G SGSN 2G SGSN

Internet

Intranet

3G SGSN

DN03524007




The modular structure also allows for a compact design, which makes theexchange easy to install and helps to maintain efficient power consumption.Furthermore, it enables the use of sophisticated back-up techniques ensuringextremely high reliability and availability, with minimum downtime even duringsystem expansions and service operations.


2.2 DX 200 system architecture and BSC3i blockdiagram

Like the previous generations of DX 200 products, the Nokia GSM/EDGE BSC3inetwork element is designed with a modular software and hardware structure,which enables a distributed processing architecture. The distribution of processesis achieved by using a multi-processor system, in which the functions of theexchange are divided among several functional entities, called functional units .

Each functional unit has a separate task group to handle. For example, the SwitchMatrix has been organized as a separate unit, Group Switch (GSWB) and it iscontrolled by another unit, called the Marker and Cellular Management Unit(MCMU). The key operation and maintenance functions are performed by theOperation and Maintenance Unit (OMU), the external PCM lines are interfacedby the Exchange Terminals (ETs), and so on.

Each functional unit has its own, separate hardware and software; most of themare equipped with a dedicated Pentium computer. These units are referred to ascomputer units and they are interconnected by the fast Message Bus, which againis organized as a functional unit of its own.

Presented in the Block diagram of the BSC3i figure is the block diagram of theexchange, which also shows the interfaces between the functional units and thoseconnecting the system to the environment. The hardware of the functional unitsand the tasks each unit handles are described in more detail in the sectionFunctional unit descriptions . Further information is available in the ProductDescription .

The figure Block diagram of the BSC3i presents the block diagram of the BSC3i.



15 (96)


Figure 2. Block diagram of the BSC3i


2.3 DX 200 redundancy principles

The reliability of the operations in the DX 200 network elements has beenensured by backing up all crucial parts of the system following variousredundancy principles, as described in the sections below.

Redundancy of the functional units

Different redundancy techniques are used for backing up different types offunctional units. Each unit participating in the switching functions or recording ofstatistical data is backed up according to the 2n redundancy principle, forexample, by duplication according to the hot-standby or spare-device method. On

ET

SGSN

OMU

CLS

BCSU

ET

GSWB

BTS

ETMSC

MB

TCSM 2

X.25

PCU

A ter

Hard DiskDrive

MO Drive

PCU LANSwitch

IP

MCMU

PCU LANSwitch

SGSN

A

DN03505883

LAN




the other hand, each signalling unit is backed up according to the n+1 or n+1/Lprinciple. The former term means that there is one spare unit available to takeover the tasks of a faulty unit; in the latter case, the workload is shared betweenall devices, and if one malfunctions the other units are able to carry the full load.

Redundant functional units should be consistent, owing to redundancy principles.

The redundancy principle applied to each type of functional unit in the exchangeis given in the section Functional unit descriptions .

Redundancy of the power distribution, clock signal distribution and wiredalarm collection systems

Virtually the entire power distribution chain from the rectifiers and power feedcables to individual pieces of equipment in the cabinets has been duplicated tominimise the risk of downtime due to power failures in the DX 200 equipment orcabling. On one hand, the redundancy for the power supply from the rectifiers tothe cabinets has been achieved by duplicating the power inputs in the cabinets,along with the input cables. On the other hand, the cabinet is equipped with aduplicated power distribution and fuse unit, which allows for feeding the voltagesto units backing each other up through two separate distribution lines.

Likewise, the DX 200 network elements have a duplicated clock distribution andalarm collection system. The basic clock signal can be fed to each BSC3i networkelement from up to six inputs, four from other exchanges (in the same network orPSTN ) and two from external sources.

Ensuring reliability at unit level

At unit level, the following methods are used to ensure proper operation:

. error correcting RAM in critical parts

. parity bit or ECC in read-write memories

. parity checks in data transmission

. reporting on certain error events in data transactions on the system bus

. memory area protection (standard Intel processor capability)

. automatic testing of connections

. time-out supervision

. validity checks for input data on different program levels

. vital data (for example, call/event data) in protected memory



17 (96)


. continuous supervision of the functioning of processes including restarts,when required

. continuous testing of operations (as background run) in all computer units.

Backing up units without nominal redundancy

Some of the functional units of the exchange are described in this manual ashaving no redundancy at all. These include, for example, the ETs, that is, unitswhich interface the exchange to the environment. In fact, these units can also bebacked up by ensuring that there is a sufficient number of circuits available in thesame direction.

Another way to look at the these units is to consider all units of a given type as apool of resources, with several units available at a time to handle an assignment.A failure in one unit will only reduce the size of the pool but not interrupt thetraffic; consequently, redundancy for the pool as a whole can be ensured simplyby reserving some extra capacity for it when dimensioning the capacity of theexchange.





3 Mechanical construction of the BSC3i

The basic mechanical structure of the BSC3i network element follows a standardhierarchy:

. cabinets

. cartridges

. plug-in units

. internal cables.

The system is easy to install, maintain and operate. Particular attention has beenpaid to thermal and interference factors.

For a general introduction, see Overview of Engineering for BSC3i .

3.1 BSC3i cabinet BSCC

The equipment of the BSC3i network element is installed in a IC209-A cabinetvariant. The cabinet has a welded frame structure and it is designed followingprinciples based on IEC, EN, ETSI, UL and Telcordia recommendations, withadvanced features in terms of safety, protection against interference, stability anddurability.

The IC209-A meets the EN 60950 and UL 1950 safety requirements, along withthe ETSI ETS 300019-1-3, Class 3.1E environmental requirements. Theearthquake resistance of the cabinets is in accordance with Telcordia GR63COREZone 4, and the EMC emission and immunity features comply with the EN300386-2 and FCC 15 Part 47 standards respectively.

The IC209-A is dimensioned according to ETS 300119-2 standard. The emphasisof the design is on easy transportability and suitability for installations inpremises with normal room height. Due to the simple mechanical structure withrelatively few components, the equipment cabinets are easy to assemble anddisassemble when necessary.



19 (96)

Mechanical construction of the BSC3i

The IC209-A cabinet consists of the following parts (see Figure Equipmentcabinet IC209-A and its components ):

. welded cabinet frame (IC209-A)

. one Power Supply Connector Groups (PSCG3-B)

. four Power Distribution Fuse Units (PDFU-A)

. four Fan Trays (FTRB) for forced cooling

. doors rear and front, left and right

. two side plates (SCP)

. support rails for cartridge shelves

. cartridge shelves

. cable supporting shelves

. wheels

. adjustable feet for permanent installation

. one RJ45 connector and LC-LC adapter and BNC connector and D25connector panel (CPRJ45)

. two cabling panels with grounding outlets (CPGO)

. one cover for cable conduit (COCC)




Figure 3. Equipment cabinet IC209-A and its components

Indoor cabinetIC209-A

Powerdistributionand fuse unit

Dual lineDC filter

Right hand sidedoor for indoorcabinet

Cable supportshelf

Horizontalgrounding bar

Left hand sidedoor for indoorcabinet

Rail for shelves

Cartridge

Verticalgrounding bar

Cartridge shelfwith place forfan units

Adjustment feetWheel

Cover for wheel box

Air guide

Cartridge shelf

CPGO CPRJ45CPGO

COCC

DN0280211

Door grounding cable

Door grounding cable



21 (96)


Note

The cabling panels with grounding outlets (CPGO) are installed at site.

The IC209-A cabinet is equipped with wheels to facilitate moving at the site.Prior to permanent installation, the cabinet(s) of BCS3i are fitted with adjustablefeet and lined up side by side in cabinet rows. The dimensions of the IC209-Aequipment cabinet are given in the section BSC3i cabinet description .


3.2 Cartridges

The cartridges are installed in the cabinets at the factory. In the design of thecartridges, particular attention has been paid to durability even under demandingconditions, along with dimensioning for optimal use of cabinet space. Onecartridge usually contains the equipment of one functional unit. Two types ofcartridges are used in the BSC3i:

. cPCI cartridges

. non-cPCI cartridges.

cPCI cartridges

The cPCI cartridges house the computer units of the exchange. The cPCIcartridges connect to the Message Bus and they use the cPCI bus forcommunication between the plug-in units in the same cartridge. The plug-in unitsin the cPCI cartridges connect to the motherboards of the cartridges through HardMetric connectors, which are designed in accordance with the IEC 1076-4-101standard. Empty plug-in unit slots of the cPCI cartridges are covered with dummypanels. The cPCI cartridges come in three different sizes:

. 1/2�shelf cartridge, comprising type CM2C-A

. 1/3-shelf cartridge, comprising type CC3C-A

. 1/4-shelf cartridge, comprising type CC4C-A.




Figure 4. cPCI cartridge and the cartridge shelf

Non-cPCI cartridges

The non-cPCI cartridges are those housing units not equipped with the cPCI bus,for example, the Exchange Terminals, Interworking equipment, storage deviceunits, clock equipment and the duplicated Group Switch. The plug-in units in thenon-cPCI cartridges connect to the motherboards of the cartridges by means ofstandard Euroconnectors. The non-cPCI cartridges come in three sizes:

. 1/2-shelf cartridge, comprising type ET4C-B

. 1/4-shelf cartridge, comprising type SW1C-C

. 1/6-shelf cartridges, comprising type CLOC-B.


3.3 Plug-in units

There are approximately 20 different plug-in units used in the BSC3i, includingthe ANSI and ETSI variants of ET2 plug-in units. In addition, there are twocombinations of a mass memory and an adapter: WDU (WDW18-S, WDW36 orlater) with an HDPU-A and MO91 with an ODPU-A. The printed circuit boards

M4 x 10

DN9836707



23 (96)


of the plug-in units are multi-layered and covered with a protective coating. Highquality Hard Metric, SMB, RJ-45 and Euroconnectors are used as connectors.Both surface-mounted and through-hole components are used. The plug-in unitsfall in two categories: cPCI plug-in units and non-cPCI plug-in units.

Mechanical construction of cPCI plug-in units

The cPCI plug-in units are designed according to advanced constructionprinciples based on the IEEE P1101.10 standard. The cPCI environment setssomewhat stricter requirements for the construction of the hardware than that of astandard computer cartridge.

For example, the insertion and extraction forces to be managed when installing orremoving the cPCI plug-in units are considerably greater than they are for the'normal' plug-in units. This is due to the higher number of connector pins neededfor establishing the connection via the cPCI. For a single plug-in unit, the force tobe managed may be as high as 400 N, equal to the weight of 41 kilograms. Toovercome such forces, the cPCI plug-in units are equipped with attachment andremoval handles at the top and bottom of the front plate for easy installation.

The front panels of the units are made of aluminium or aluzinc plated steel metal.In addition to durability, particular attention has been paid to logical and user-friendly design, with systematical positioning of the LED indicators and switchesfor easy operation and monitoring of the unit's condition.

As a general rule, connectors for cables entering the equipment in the cPCIcartridges are placed on the motherboards of the cartridges; only connectors forService Terminals, which are needed only for temporary use, are located on thefront panels of the plug-in units.

The printed boards of the cPCI plug-in units are all of an equal size: 233.4 mm x220 mm (9.2 in x 8.7 in).




Figure 5. Example of cPCI plug-in units CP710-A, PSC6-A, MBIF-B, AS7-Band PCU-B

Mechanical construction of non-cPCI plug-in units

The mechanical construction of non-cPCI plug-in units is based on principlesfamiliar from previous generations of DX 200 products. The non-cPCI plug-inunits are equipped with lock springs for easy and firm installation in thecartridges.

The non-cPCI plug-in units come in a single or double Eurocard size:

. 110 mm x 160 mm (4.3 in x 6.3 in); or

. 233.4 mm x 160 mm (9.2 in x 6.3 in).

OPR

ON

OFF

AP

OPR

DN01195329

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPCI

SCSI

ETx0

ERx0

ETx1

ERx1

RUN0

RUN1



25 (96)



3.4 Cabling

The cabling of a BSC3i consists of intracabinet cables and external cables.

The intracabinet cables comprise all the cables inside each cabinet and betweenthe cabinets which form a single exchange. They are cut to length and equippedwith connectors of either Hard Metric or Euroconnector type.

The external cables include:

. E1/T1 cables

. external alarm cables

. power supply cables

. grounding cables

. I/O cables

. LAN/Ethernet cables; and

. X.25 cables.

The general cabling principle for the BSC3i network element is as follows: allcables except power cables entering the BSC3i cabinet are grounded either at thecabling panels with grounding outlets (CPGO; X.25, trunk circuit cables, and analternative external alarm input cable) or the CPRJ45 connector panel (all othercables).





4 BSC3i cabinet and Side Cable Conduit

This section gives a general description of the BSCC cabinet and Side CableConduit (SCC).

Note

The SCC is required only when the equipment room has a raised floor.

4.1 BSC3i cabinet (BSCC)

The following sections give a general description of the cabinet type used in theBSC3i, that is, the BSCC. For a general introduction, see Overview ofEngineering for BSC3i .

The BSCC cabinet has fixed cartridge configuration. Although it may be onlypartially equipped, if the customer does not need to utilize the full BSC3icapacity, each cartridge in the cabinet accepts a functional unit of only certaintype. All cartridges are installed in the cabinets at the factory.

The figure below illustrates the BSCC cabinet.



27 (96)

BSC3i cabinet and Side Cable Conduit

Figure 6. The BSCC cabinet and the position of the Side Cable Conduit (SCC)

Note

The SCC can be installed on either side of the cabinet.

Cabinet dimensions

The dimensions of the cabinet types are (H × W × D) 2000 mm × 900 mm × 600mm. The depth of the cabinet doors is included in the depth measure.

BSCC

DN01195344 FRONT VIEW

FTRB 0

GSWB 1SW1C-C

GSWB 0SW1C-C

CPGO

BCSU 6CC3C-A

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

BCSU 2CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B

BCSU 3CC3C-A

BCSU 4CC3C-A

BCSU 5CC3C-A

Sidecable

conduit

Sidecable

conduit

900mm75mm 75mm

CPRJ45 CPGO

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0

FTRB 1

FTRB 3FTRB 2




When installed, the cabinet stands on approximately 50-mm-high (2 in)adjustable feet or rails. Above the cabinet row, a free space of at least 500 mm(19.7 in) is required to ensure efficient ventilation.

Functional unit configuration

The BSCC cabinet contains, among other units, the functional units which handlethe key operation and maintenance tasks in the BSC3i. The BSC3i alwaysfeatures one BSCC cabinet and its maximum configuration is:

. four Power Distribution and Fuse Units (PDFU-A)

. two Bit Group Switches (GSWB) installed in SW1C-C cartridges

. two Clock System Units (CLS) installed in a CLOC-B cartridge

. up to seven Base Station Controller Signalling Units (BCSU) with packetcontrol units installed in CC3C-A cartridges

. two Marker and Cellular Management Unit (MCMU) installed in CC4C-Acartridges

. one Operation and Maintenance Unit (OMU) installed in CM2C-Acartridge

. up to 124 Exchange Terminal Units (64 ETs in ET4C0; 60 ETs in ET4C1)installed in two ET4C-B cartridges

. four LAN switches (ESB20�A) installed in the CC4C-A cartridges withthe MCMU

. four Fan Trays (FTRB) for forced ventilation.

Figure Equipping of the BSCC cabinet presents equipping of the BSCC cabinet.For more detailed information on functional units, see their descriptions .



29 (96)


Figure 7. Equipping of the BSCC cabinet

Connector Panel (CPRJ45) and Cabling Panel with Grounding Outlets(CPGO)

There are three holes at the top of the BSCC cabinet. The Connector Panel(CPRJ45) is located in the middle and the two cabling panel with groundingoutlets (CPGO) on both sides.

The CPRJ45 is used for providing external LAN connections, serial connections,external synchronisation input connections and external alarm connections. TheCPGO is used for lead-in for external cables (ET cables, X.25 cables, andoptional external input-type alarm cables). The sheaths of all external cables (E1/T1 cables and X.25 cables and optional alarm cables) must be grounded at CPGOwhen they leave or enter the cabinet. The cables are stripped, and the EMC gasketclamps the cable sheaths against the panel body.

BSCC

DN01195356

GSWB 1SW1C-C

GSWB 0SW1C-C

BCSU 6CC3C-A

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

BCSU 2CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

BSCC

CLS0,1

CLOC-B

GSWB 1SW1C-C

GSWB 0SW1C-C

BCSU 6CC3C-A

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

FRONT VIEW REAR VIEW

CLS0,1

CLOC-B

BCSU 3CC3C-A

BCSU 4CC3C-A

BCSU 5CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

BCSU 3CC3C-A

BCSU 4CC3C-A

BCSU 5CC3C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

BCSU 2CC3C-A

CPGO CPGOCPRJ45 CPGO CPGOCPRJ45

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0

PDFU-A2

PDFU-A1

PDFU-A0

PDFU-A3

FTRB 0 FTRB 1

FTRB 2 FTRB 3 FTRB 3 FTRB 2

FTRB 1 FTRB 0




The Connector Panel is installed at factory, whereas the cabling panel withgrounding outlets is installed at the site.

Cover for Cable Conduit (COCC)

The Cover for Cable Conduit (COCC) is used in the BSCC cabinet to protect andsection out the power supply equipment.

Power Distribution Fuse Unit (PDFU-A)

To ensure 2n redundancy for the power distribution lines, the BSC3i cabinet isprovided with four PDFU-A units located at the top of the cabinet, above the topshelf. Each PDFU-A forms an independent feeding input branches consisting ofcircuit breakers, diodes, filters, and fuses.

Fan Tray (FTRB)

To ensure forced cooling, the BSCC cabinet is equipped with four Fan Trays(FTRB), each of which contains three fans. The FTRBs are located in pairs abovethe shelf housing BCSUs 0 to 2 (FTRBs 0 and 1) and below the shelf housingBCSUs 3 to 5 (FTRBs 2 and 3).

Cover Plate (COP48T) and Shim Plate (SHIM4T)

The IC209-A cabinet is designed to use forced cooling. To achieve sufficientcooling capacity and upward air flow, the non-equipped CC3C-A cartridgeshousing the BCSU units and/or the individual plug-in unit slots are to be covered.Two types of cover plates are used for this purpose: empty CC3C-A cartridges areequipped with Cover Plates (COP48T) and empty plug-in unit slots with ShimPlates (SHIM4T). The COP48T is 48Twide and the front panel of the SHIM4T is4T wide. Equipping Cover Plates is presented in the two following figures.

Note

The number of BCSUs used determines the number of COP48Ts needed. Whenall BCSUs are in installed, that is, when the number of TRXs is 660, COP48Tsare needed no longer.



31 (96)


Figure 8. Equipping Cover Plates for configuration steps one, two and three

BSCC

GSWB 1SW1C-C

GSWB 0SW1C-C

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B

COP48T

COP48T

COP48T

COP48T COP48T

Basic configuration(1+1 BCSU; 110 TRX)

BSCC

GSWB 1SW1C-C

GSWB 0SW1C-C

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B

COP48T

COP48T COP48T COP48T

2nd configuration step(2+1 BCSU; 220 TRX)

BSCC

DN01195371

GSWB 1SW1C-C

GSWB 0SW1C-C

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B

COP48T

COP48T COP48T

3rd configuration step(3+1 BCSU; 330 TRX)

BCSU 3CC3C-A

BCSU 2CC3C-A

BCSU 2CC3C-A

CPGO CPRJ45 CPGO

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0

FTRB 0 FTRB 1

FTRB 2 FTRB 3

CPGO CPRJ45 CPGO CPGO CPRJ45 CPGO

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0






Figure 9. Equipping Cover Plates for configuration steps four, five and six


4.2 Side Cable Conduit (SCC)

In equipment rooms with a raised floor, the Side Cable Conduit (SCC) is usedwith each BSCC cabinet for cabling external cables. The SCC can be installed oneither side of the cabinet. (See Figure Side Cable Conduit (SCC) .)

BSCC

GSWB 1SW1C-C

GSWB 0SW1C-C

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B

COP48T

COP48T

4th configuration step(4+1 BCSU; 440 TRX)

BSCC

GSWB 1SW1C-C

GSWB 0SW1C-C

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B

COP48T


BCSU 2CC3C-A

BCSU 2CC3C-A

BCSU 3CC3C-A

BCSU 4CC3C-A

BCSU 3CC3C-A

BCSU 4CC3C-A

BCSU 5CC3C-A

BSCC

DN01195383

GSWB 1SW1C-C

GSWB 0SW1C-C

MCMU 1CC4C-A

MCMU 0CC4C-A

OMUCM2C-A

BCSU 0CC3C-A

BCSU 1CC3C-A

ET4C 1ET4C-B

(30 ET2E/A)

ET4C 0ET4C-B

(32 ET2E/A)

CLS0,1

CLOC-B


BCSU 2CC3C-A

BCSU 3CC3C-A

BCSU 4CC3C-A

BCSU 5CC3C-A

BCSU 6CC3C-A

CPGO CPRJ45 CPGO

FTRB 0 FTRB 1

FTRB 2 FTRB 3

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0

CPGO CPRJ45 CPGO CPGO CPRJ45 CPGO

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0

PDFU-A1

PDFU-A2

PDFU-A3

PDFU-A0





33 (96)


Figure 10. Side Cable Conduit (SCC)

The dimensions of the SCC are (H × W × D) 2000 mm × 600 mm × 75 mm (78.7in × 23.6 in × 2.95 in).


4.3 Dimensioning the BSC3i capacity

Owing to its modular hardware structure, the BSC3i can be flexibly configured tomeet the capacity requirements of individual customers. The call handlingcapacity of a network element depends, on one hand, on the number of callcontrol computer units in the system, and on the other hand, on its PCM capacity.When it is necessary to increase the capacity, the system can be easily expandedby simply adding new units to the existing configuration.

The minimum configuration of the BSC3i features one BSCC cabinet with aminimum number of BCSU functional units, that is, two BCSUs.

DN01195368





5 Introduction to the BSC3i functional unitdescriptions

The functional unit types of the BSC3i are described in the following sections.Each description includes the information on the basic configuration of thefunctional unit and the expansion possibilities, if such exist. The descriptions arepresented in alphabetical order. The following functional units are used in theBSC3i:

. Base Station Controller Signalling Unit (BCSU) in the BSC3i

. Clock and Synchronisation Unit (CLS) in the BSC3i

. Exchange Terminal (ET) in the BSC3i

. Bit Group Switch (GSWB) in the BSC3i

. IP interfaces in the BSC3i

. Marker and Cellular Management Unit (MCMU) in the BSC3i

. Message Bus (MB) in the BSC3i

. Operation and Maintenance Unit (OMU) in the BSC3 i

. Power Distribution Fuse Unit (PDFU-A) in the BSC3i

For a general introduction, see Overview of Engineering for BSC3i

General configuration rules

There are some general rules in configuring the BSC3i:



35 (96)

Introduction to the BSC3i functional unit descriptions

. Shim Plates are used for covering empty slots in each computer cartridgeand Cover Plates are used to cover empty BCSU cartridges.

. Memory modules are installed into the CPU. In one computer unit onlyone type of memory module needs to be used (256MB).

. All functional units that are of the same type must have consistentconfiguration.




6 Base Station Controller Signalling Unit(BCSU) in the BSC3i

Purpose: The BCSU handles those functions of the BSC which are highly dependent on theamount of traffic. It controls the signalling and traffic on both A-interface and Abis-interface and provides access to the GPRS core network - optional feature.

Redundancy: n+1

Type: Computer unit with no sub-units

Number of BCSUs inthe BSC3i:

6+1

Packet control units: Frame Relay (FR) connections to SGSN direction are available forthe PCU-Bs in the BCSU (in slots 06 and 07).

Plug-in units: PSC6-A/-B Power Supply for Cartridge

AS7-B/-C Preprocessor (CCS7; LAPD)

PCU-B Packet Control Unit

MBIF-B Message Bus Interface

CP710-A Central Processing Unit

Interfaces: Message Bus Interface

GSWB

LAPD

CCS7

LAN

The minimum number of BCSUs in the BSC3i (in one BSCC cabinet) is two; themaximum number is seven. The BCSU equipment is housed in the CC3C-Acartridge and the basic configuration includes the plug-in units shown in BCSUequipment in the CC3C-A cartridge .



37 (96)

Base Station Controller Signalling Unit (BCSU) in the BSC3i

The PCU-Bs are optional.

Figure 11. BCSU equipment in the CC3C-A cartridge

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

AS72

AS71

AS70

PCU

0

PCU

1ETx1

ERx1

RUN0

RUN1

RUN0

RUN1

DN01195402




Figure 12. BCSU equipment in the CC3C-A cartridge (S11 release level)

Table 1. Plug-in units of the BCSU.

Position Name Function Standard/Optional

Notes

F01 PSC6-A/-B Power Supply Standard

F02 SHIM4T Shim Plate Standard

F03 AS7-B CCS7/LAPD Standard 2)

F04 AS7-B LAPD Standard 2)

F05 AS7-B/-C LAPD/CCS7 andLAPD

Standard 3)

F06 SHIM4T/PCU-B

Shim Plate /Packet ControlUnit

Standard/Optional

1)

OPR

PSC60

ON

OFF

MBIF

0

MBIF

1

CPU0

AP

AS72

PCU4

PCU6

PCU3

PCU5

RUN 0 RUN 0

RUN 1RUN 1

OPR OPR

DBG

RST

J6

J7

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx1

ETx0

ERx0

ERx1

DN03513563

1 2 3 4 5 6 7 8 9 10



39 (96)

Base Station Controller Signalling Unit (BCSU) in the BSC3i

Table 1. Plug-in units of the BCSU. (cont.)


Notes

F07 SHIM4T/PCU-B

Shim Plate /Packet ControlUnit

Standard/Optional

1)

F08 MBIF-B Message BusInterface

Standard 4)


Standard 4)

F10 CP710-A Central Processor Standard

F10 MR256M Memory forCP710-A

Standard

1) If PCU-B is not equipped in this slot, SHIM4T is equipped.

2) If AS7 is not equipped in this slot, SHIM4T is equipped.

3) In S11 one AS7-C (in slot F05) replaces all earlier three AS7-Bs (F03, F04 andF05). Its function is CCS7/LAPD.

4) The interchangeability code of the MBIF-B must be the mimimum of E withthe AS7C in the same unit.

Note

Please note that due to general N+1 redundancy principle of the fault tolerant DX200 Computing Platform equal amount of AS7 plug in units must be configuredin every BCSU unit. This means that all BCSUs need to include either 3 x AS7-Bunits (standard S10.5 configuration) or 1 x AS7-C unit (standard S11configuration). Therefore S10.5 based HW configurations need to be extendedwith S10.5 HW based BCSU extensions. Correspondingly S11 based BCSUextensions are needed for S11 HW based BSC3i"

Introduction to DX 200 BCS3i functional unit descriptions




7 Clock and Synchronisation Unit (CLS) inthe BSC3i

Purpose: The CLS generates the clock signals necessary for the BSC. The oscillator of the CLS isnormally synchronised to an external source, usually an MSC, through a PCM line. Up totwo additional PCM inputs are provided for redundancy.

Redundancy: 2n

Type: Functional unit with no sub-units

Number of CLSunits in the BSC3i:

2 (one CL3TG plug-in unit contains one entire CLS unit)

Plug-in units: CL3TG Clock and Synchronisation Unit

Interfaces: Synchronisation input

Synchronisation output

External synchronisation input

Wired alarm interface to OMU via GSWB

The exchange contains two Clock and Synchronisation Units in a CLOC-Bcartridge. The basic configuration is illustrated in Figure Two Clock andSynchronisation Units (CLS) in the CLOC-B cartridge and Table Plug-in units ofthe CLSU .



41 (96)

Clock and Synchronisation Unit (CLS) in the BSC3i

Figure 13. Two Clock and Synchronisation Units (CLS) in the CLOC-B cartridge

Table 2. Plug-in units of the CLSU


Notes

F00 CL3TG CLS Standard

F03 CL3TG CLS Standard

The BSC3i always features two independent CLS functional units, that is, twoClock and Tone Generator plug-in units (CL3TG) in one CLOC-B cartridge.

Performance characteristics of CL3TG

In the plesiochronous operation mode, the frequency shift of the CL3TG is 2 x10-8 within each 24-hour period, if the temperature of the environment does notvary.

Number of synchronisation inputs:

DN01195492

CLxTG

0

CLxTG

1

0300




. four from PCM lines

. two external inputs (120 ohm balanced / 75 ohm unbalanced)

Introduction to DX 200 BSC3i functional unit descriptions



43 (96)

Clock and Synchronisation Unit (CLS) in the BSC3i

8 Exchange Terminal (ET) in the BSC3i

Purpose: The Exchange Terminal (ET)

The ET performs the electrical synchronisation and adaptation of external PCM lines. Itperforms the AMI or B8ZS (ET2A), or HDB3 (other ET2 plug-in units) coding anddecoding, inserts the alarm bits in the outgoing direction and produces PCM framestructure. All ET2 plug-in units contain two separate ETs but the ET1E plug-in units of thefirst generation BSC contain only one ET.

Redundancy: None

To ensure redundancy for the ET2 plug-in units, we recommend that the ETs interfacingPCMs to the same direction be installed in cartridges or slots fed by different PDFUs.


Plug-in units: ET2E-S/-T Exchange Terminal with Euroconnector (balanced E1 interface) inETSI environment

ET2E-SC/-TC Exchange Terminal with coaxial connectors (unbalanced E1interface) in ETSI environment

ET2A/-T Exchange Terminal with RJ-45 connectors (balanced T1interface) in ANSI environment

Interfaces: GSWB

Control interface from a signalling unit (via GSWB)

PCM (E1/T1)

Synchronisation

The ETs are housed in ET4C-B cartridges. One ET4C-B cartridge can contain upto 32 ET2E-T, ET2E-TC or ET2A-T plug-in units. The total number of ET plug-in units in the BSC3i is 62 (32 in ET4C0, 30 in ET4C1) and the total number ofPCMs is 124.

Note

One ET2E-S, ET2E-SC or ET2A plug-in unit contains two ET functional units.



45 (96)

Exchange Terminal (ET) in the BSC3i

Note

The ET2E/-S plug-in units with balanced interfaces currently in use can bereplaced with totally interchangeable ET2E-T plug-in units, the ET2E-C/-SCplug-in units with unbalanced (coaxial) interfaces can be replaced with ET2E-TCplug-in units, and the ET2A plug-in units can be replaced with ET2A-T plug-inunits in the ANSI environment.

Figure 14. ET equipment in the ET4C-B cartridge

Table 3. The ET plug-in units

Position Name Standard/Optional

Note

F0-F29 ET2E-T/ET2E-TC/ET2A-T

Optional

F30, F31 ET2E-T/ET2E-TC/ET2A-T

Optional *)

01 1513120907050300 02 04 06 08 10 11 14

17 3129282523211916 18 20 22 24 26 27 30

DN01195414

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC




*) Slots F30 and F31 are not equipped in ET4C-B 1.




47 (96)

Exchange Terminal (ET) in the BSC3i

9 Bit Group Switch (GSWB) in the BSC3i

Purpose: The duplicated Group Switch (GSWB) 256 is the switching fabric of the BSC3i. TheGSWB is housed in two identical SW1C-C cartridges, and it conveys the traffic passingthrough the BSC3i and switches the tones to the subscribers of the exchange and to thetrunk circuits. It also establishes the needed connections to the signalling units and theinternal data transmission channels, and is responsible for the submultiplexing functionsof the BSC3i.

The operation of the GSWB is controlled and supervised by the Marker and CellularManagement Unit (MCMU; SWCOP-A).

Redundancy: 2n with MCMU

Type: Functional unit, sub-unit of the Marker and Cellular Management Unit

Plug-in units: SW64B Switching Network (8 Bit/s channels)

PSC1-S Power Supply for Cartridge

Interfaces: Switch control bus from Marker and Cellular Management Unit

GSWB PCMs to some computer units, all ETs

Due to redundancy requirements, the BSC3i always contains two GSWBs. TheGSWB equipment is housed in the SW1C-C cartridge and the basic configurationincludes the plug-in units shown in Figure GSWB equipment in the SW1C-Ccartridge and Table Plug-in units of the GSWB in a SW1C-C cartridge .



49 (96)

Bit Group Switch (GSWB) in the BSC3i

Figure 15. GSWB equipment in the SW1C-C cartridge

Table 4. Plug-in units of the GSWB in a SW1C-C cartridge


Notes

F00

F01

F02 SW64B SwitchingNetwork

Standard


Standard


Standard


Standard

F02-F05 SWBUS4 Bus Extender Standard *)

DN01195426

SW64B

SW64B

PSC1

SW64B

02 03 04 05 060100 07

SW64B




Table 4. Plug-in units of the GSWB in a SW1C-C cartridge (cont.)


Notes

F06 PSC1-S Power Supply Standard

*) Connects four SW64B plug-in units to each other.




51 (96)

Bit Group Switch (GSWB) in the BSC3i

10 IP interfaces in the BSC3i

The SWU (Switch Unit) refers to the various LAN switch equipment usedregardless of their physical hardware implementation (ESB20/-A).

Purpose: The integrated LAN switches are standard in the first deliveries of the BSC3i. Theinterfaces are composed of two ESB20(-A)s. The LAN interfaces have redundant 100Mbit/s up-link connections to the IP network.

Redundancy: 2n

Type: Functional unit

Plug-in units: ESB20(-A) LAN switch unit (2 uplink and 18 downlink electrical 10/100Mbit/s ports)

Interfaces: Uplink interfaces to the IP network (router)

Uplink interfaces to an additional LAN switch via the cabling panel for LANs and serialinterfaces (CPRJ45) in the BSCC cabinet

SWU provides access to the operator's IP network as a first level LAN switch. Itprovides uplink interfaces to the IP network (router) or to an additional LANswitch via the BSC3i connector panel. SWUcollects data from the computer andpacket controller units and sends it further to external routers and the IP networkvia 100 Mb/s uplink connections. Redundant LAN-switch units provide ports of10/100BaseT/Tx interfaces with RJ45 connectors via the BSC3i connector panel.There are in total 4 + 4 10/100BaseT/Tx uplink ports to the operator's IP network.

One LAN SWU pair is dedicated to collecting user-plane traffic from packetcontrol units (PCU) and another to collecting data from computer units (CPU).

Figure The LAN connection principle in the BSC3i depicting the LAN SwitchUnits (ESB20/-A) in the MCMU cartridges (CC4C-A) clarifies the LANconnection principle.



53 (96)

IP interfaces in the BSC3i

Figure 16. The LAN connection principle in the BSC3i

Integrated LAN switches (ESB20/-A plug-in units) are presented in LANswitches in the MCMUhousing CC4C-A cartridge .

IPNetwork

BCSU 0CPU

BCSU 6CPU

MCMU 0CPU

OMUCPU

MCMU 1CPU

MCMU 0 MCMU 1

BCSU 0 BCSU 6

VRRP

2 x 100 Mbit/suplink


2 x 100 Mbit/s

2 x 100 Mbit/s

EMC interface(connector panel)

100 Mbps

PCU PCU PCU PCU

SWU 1

SWU 3

SWU 0

SWU 2

BSC3i cabinet

dn01195508






Figure 17. LAN switches in the MCMUhousing CC4C-A cartridge

Note

In the BSC3i, the LAN switches for the IP interfaces are composed of the twoESB20/-As housed in the CC4C-A cartridge with the MCMU functional unit.The PSC6-A/B provides power supply in the CC4C-A cartridge for the ESB20/-As as well as the MCMU equipment. (See Table Plug-in units of the MCMUhousing SWU units where the LAN switch plug-in units and the power supplyplug-in unit are indicated by the use of emphasised font.)

Table 5. Plug-in units of the MCMUhousing SWU units


Notes


F02 ESB20(-A) Ethernet Switchwith 20 ports

Standard

1 2 4 5 6 73

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPROPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

SWCOP

ESB20

ESB20

ETx1

ERx1

J7

J6

J7

J6

DN01195438

J5 J5

OPROPR

RSTRST



55 (96)


Table 5. Plug-in units of the MCMUhousing SWU units (cont.)


Notes

F03 ESB20(-A) Ethernet Switchwith 20 ports

Standard

F04 SWCOP-A Switch ControlProcessor

Standard


Standard


Standard

F07 CP710-A CentralProcessor

Standard


Standard





SWU for CPU LAN

Figure 18. CPU LAN architecture

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

BSCC

LAN

2*100Mb/sUPLINK

2*100Mb/sUPLINK

IPNETWORK

NE boundary

*)

*) ESB20: the redundancy cables are left connected if the uppermostswitching stage is a Router or a LAN switch with router features. Theredundancy cables are disconnected if the uppermost switching stageis an L2 switch.

Since ESB20 -A: the Rapid Spanning Tree Protocol (RSTP) is enabledin the LAN subnetwork and the redundancy cables are left connected.

CPU

MCMU0

CPUBCSU0

CPU

OMU

MESSAGEBUS

ESB20/-A

ESB20/-A



57 (96)


SWU for PCU LAN

Figure 19. PCU LAN architecture

Internal LAN management

Figure Overview of internal LAN management in BSC3i illustrates internal LANmanagement in the network element.

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

BSCC

LAN

2*100Mb/sUPLINK

2*100Mb/sUPLINK

IPNETWORK

NE boundary

*)

*) ESB20: the redundancy cables are left connected if the uppermostswitching stage is a Router or a LAN switch with router features. Theredundancy cables are disconnected if the uppermost switching stageis an L2 switch.

Since ESB20 -A: the Rapid Spanning Tree Protocol (RSTP) is enabledin the LAN subnetwork and the redundancy cables are left connected.

PCU-B

MESSAGEBUS

ESB20/-A

ESB20/-A

BCSU0

PCU-B

PCU-BBCSU1

PCU-B

PCU-BBCSU6

PCU-B




Figure 20. Overview of internal LAN management in BSC3i

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

ESB20/-A

BSCC

2*100Mb/sUPLINK

2*100Mb/sUPLINK

ESB20/-A

IPNETWORK

CPU

CPU

CPU

MCMU

BCSU

OMU

ESB20/-A

LAN

2*100Mb/sUPLINK

2*100Mb/sUPLINK

ESB20/-A

IPNETWORK

NE boundary

MESSAGEBUS

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

BCSU0

PCU-B

PCU-B

PCU-B

PCU-B

PCU-B

PCU-B

BCSU1

BCSU6

*)

*)

*) These 2 pcs LAN cables (required for internal LAN management)arefor chaining the two ESBs in the same MCMU**) LAN Device integration SW distribution channel

**)

**)

**)

**)

MESSAGEBUS

DN03505953



59 (96)


11 Marker and Cellular Management Unit(MCMU) in the BSC3i

Purpose: The MCMU controls and supervises the GSWB and performs the hunting, connectingand releasing of the switching network circuits. The range of the tasks it handles makesup a combination of general marker functions and radio resource management functions.

The MCMU is connected to the other computer units of the exchange, OMU and BCSU,through the message bus.

Redundancy: 2n

Type: Computer unit with no sub-units


ESB20(-A) Ethernet Switch for B-series with 20 ports

The two ESB20(-A)s constitute the LAN switches for theBSC3i.

SWCOP-A Switch Control Processor




GSWB

Lb interface

The BSC3i always contains two MCMUs. The MCMU equipment is installed ina CC4C-A cartridge and the basic configuration includes the plug-in units shownin MCMU equipment in the CC4C-A cartridge .



61 (96)

Marker and Cellular Management Unit (MCMU) in the BSC3i

Figure 21. MCMU equipment in the CC4C-A cartridge

Note

The two ESB20/-As housed in the CC4C-A cartridge with the MCMU areindependent from the MCMU equipment. However, they share the power supply,the PSC6-A/-B, with the MCMU equipment. In Table Plug-in units of theMCMU , the MCMU equipment and the power supply plug-in unit are indicatedby the use of emphasised font.

Table 6. Plug-in units of the MCMU


Notes


F02 ESB20/-A Ethernet Switchwith 20 ports

Standard

F03 ESB20/-A Ethernet Switchwith 20 ports

Standard

1 2 4 5 6 73

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPROPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

SWCOP

ESB20

ESB20

ETx1

ERx1

J7

J6

J7

J6

DN01195438

J5 J5

OPROPR

RSTRST




Table 6. Plug-in units of the MCMU (cont.)


Notes

F04 SWCOP-A Switch ControlProcessor

Standard


Standard


Standard

F07 CP710-A CentralProcessor

Standard


Standard




63 (96)

Marker and Cellular Management Unit (MCMU) in the BSC3i

12 Message Bus (MB) in the BSC3i

Purpose: The MB is the physical connection between the computer units of the exchange. It iscontrolled by the Message Bus Interface plug-in units (MBIF-B) located in everycomputer unit.

Redundancy: 2n


Plug-in Units MBIF-B in every computer unit

Interfaces: Host computer units of the MBIF-Bs

The duplicated Message Bus has a transfer rate of 32 Mbyte/s. It is controlled bythe Message Bus Interface plug-in unit (MBIF-B), which also acts as a bi-directional interface between the microcomputer and the 16-bit parallel MessageBus.

The power supply to the Message Bus terminal resistors at each end of the bus isbacked up by means of a cable which runs between the cartridge housing theterminal resistor and another cartridge on the same shelf.

The path of the message bus through the computer units and the placement of thepower supply back-up cable is shown in Figure Message bus (MB) . The figurealso shows the placement of the MB connectors and terminators on the backplane of the cartridge, as well as the power supply back up cables to the MBterminators.

The path of the Message Bus and the placement of the MB connectors on theback plane of the cartridge. The power supply to the terminal resistors at the endof each bus is backed up by means of a cable between the terminals PP2 (inBCSU0 / in BCSU1/ in MCMU0 / in MCMU1)



65 (96)

Message Bus (MB) in the BSC3i

Figure 22. Message bus (MB)


..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

MCMU 1 MCMU 0

BCSU 0

BSCC

CLS

0,1 GSWB

1GSWB

0

MCMU0

BCSU3

BCSU4

BCSU5

ET4C1

REAR SIDE

ET4C0

BCSU0

BCSU1

BCSU2

MCMU1

OMU

BCSU6

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

BCSU 1

PDFU 3 PDFU 2 PDFU 1 PDFU 0

MBUS connector

MBUS terminator TRM9BDN0264018




13 Operation and Maintenance Unit (OMU)in BSC3i

Purpose: The Operation and Maintenance Unit (OMU) acts as an interface between the user andthe BSC3i and takes automatic recovery measures on the basis of its collected faultdata when required. The tasks of the OMU can be divided into four groups:

" LAN supervision and LAN topology management

" traffic control functions

" maintenance functions

" system configuration administration functions

" system management functions.

The OMU has dedicated storage devices, which serve as a storage, for example, for theentire system software of the exchange as well as for the event buffer for intermediatestoring of alarms.

Redundancy: -

Type: Computer unit, with a storage device unit as a sub-unit


AS7-B/-C Preprocessor (LAPD and clock control channel)

AC25-A Adapter for Communication X.25

SERO-A Serial Interface

HWAT-A Hardware Alarm Terminal



ODPU-A + MO91 Optical Device Plug-in Unit

HDPU-A + WDU(WDW18-S, WDW36or later)

Hard Disk Plug-in Unit



67 (96)

Operation and Maintenance Unit (OMU) in BSC3i


GSWB

LAN

Wired Alarm Interface

External Alarm Interface

Interface to External Alarm Unit (EXAU)

Clock control channel

Serial Interface (VDU and LPT)

The network element contains one OMU � so there is no redundancy.

S10.5 First delivery

In S10.5 the OMU equipment is housed in the CM2C-A cartridge and the basicconfiguration includes the following plug-in units (see Figure OMU equipment inthe CM2C-A cartridge, S10.5 and Table Plug-in units of the OMU, S10.5 ).

Figure 23. OMU equipment in the CM2C-A cartridge, S10.5

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

AS72

AS71

AS70

SERO

HWAT

ETx1

ERx1

FDU

WDU

0

WDU

1

12 13 14

SW0

SW1

RST

DN01195441




Table 7. Plug-in units of the OMU in BCS3i, S10.5

Position Name Function Equipment Notes

F01 PSC6-A Power Supply Standard

F02 SHIM4T Front panel with Shim plate Standard

F03 AS7-B Q1/LAPD Standard

F04 SHIM4T/ AS7-B/AC25- A

Front panel with Shim plate/ NMS, Digital X.25 / NMS,Analog X.25

Standard/Optional/ Optional

1)

F05 SHIM4T/ AS7-B/AC25- A

Front panel with Shim plate/ NMS, Digital X.25 / NMS,Analog X.25

Standard/Optional/ Optional

1)

F06 SERO-A V.11 and V.24 Interface Standard

F07 HWAT-A Hardware Alarm Terminal Standard

F08 MBIF-B Message Bus Interface Standard

F09 MBIF-B Message Bus Interface Standard

F10 CP710-A Central Processor Standard

F10 MR256M Memory for CP710- A Standard

F12 ODPU-A Optical Device Plug-in Unit Standard Adapter for FDD 0

F12 MO91 Magneto Optical Disk Drive Standard FDD 0

F13 HDPU-A Hard Disk Plug-in Unit Standard Adapter for HDD 0

F13 WDW18-S Hard Disk Drive Standard HDD 0

F14 HDPU-A Hard Disk Plug-in Unit Standard Adapter for HDD 1

F14 WDW18-S Hard Disk Drive Standard HDD 1

1. If AS7-B or AC25-A is not equipped, SHIM4T is used in this slot.

S11 First delivery and upgrade

In S11 the OMU equipment is housed in the CM2C-A cartridge and the basicconfiguration includes the following plug-in units (see Figure OMU equipment inthe CM2C-A cartridge, S11 and Table Plug-in units of the OMU, S11 ).



69 (96)


Figure 24. OMU equipment in the CM2C-A cartridge, S11

The AS7C alternative (dig.X.25) of the first delivery includes three AS7-Cs (inslots 3, 4, and 5), and the AC25-A alternative (analog.X.25) includes one AS7-C(in slot 3) and two AC25-As (in slots 4 and 5).

The upgraded OMU (dig.X.25) includes one AS7-B (in slot 3) and two AS7-Cs(in slots 4 and 5).

Table 8. Plug-in units of the OMU, S11


F1 PSC6-B/PSC6�A PowerSupply

Standard

F2 SHIM4T Front panelwith shimplate

Standard

F3 AS7�C/AS7�B Q1 / LAPD Standard

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC60

MBIF

0

MBIF

1

CPU0

SERO

0

HWAT3

ETx1

ERx1

FDU

WDU0

WDU1

12 13 14

SW0

SW1

RST

DN03499356

AS70

AS72

AS71

POWER OFF

OFF

POWEROFF

POWEROFF

OFF OFF




Table 8. Plug-in units of the OMU, S11 (cont.)


F4 SHIM4T /AS7-C /AC25-A

Front panelwith shimplate /NMS /dig. X.25 /NMS /Analog. X.25

Standard /Optional /Optional

1)

F5 SHIM4T /AS7-C /AC25-A

Front panelwith shimplate /NMS /dig. X.25 /NMS /Analog. X.25

Standard /Optional /Optional

1)

F6 SERO-A V.11 andV.24Interface

Standard

F7 HWAT-A HardwareAlarmTerminal

Standard

F8 MBIF-B MessageBusInterface

Standard 2)

F9 MBIF-B MessageBusInterface

Standard 2)

F10 CP710A CentralProcessor

Standard

F10 MR256M Memory forCP710-

Standard

F12 ODPUA OpticalDevice Plug-in Unit

Standard Adapter for FDD 0

F12 MO91 MagnetoOptical DiskDrive

Standard FDD 0

F13 HDPUA Hard DiskPlug-in Unit

Standard Adapter for HDD 0

F13 WDW36 Hard DiskDrive

Standard HDD 0



71 (96)


Table 8. Plug-in units of the OMU, S11 (cont.)


F14 HDPUA Hard DiskPlug-in Unit

Standard Adapter for HDD 1

F14 WDW36 Hard DiskDrive

Standard HDD 1

1. If no AS7-C or AC25-A is equipped, SHIM4T remains equipped in thisslot.

2. The minimum interchangeability code of the MBIF-B is E when the AS7-C is equipped in the same unit.

The OMU cartridge (CM2C-A) houses a duplicated Adapter and Hard Disk Drivecombination (HDPU-A + WDW36) and an adapter and Magneto Optical DiskDrive combination (ODPU-A + MO91). The former functions as a system diskunit, and the latter is used for facilitating temporary service operations, forexample, data updates and downloads. In the software, the unit name for theAdapter and Hard Disk Drive combination is WDU, and for the Adapter andMagneto Optical Disk Drive, it is FDU.





14 Power Distribution Fuse Unit (PDFU-A) inthe BSC3i

Purpose: The PDFU-A distributes the -48V/-60V DC power from the site power system to thecartridges through the distribution cables. The PDFU-A also contains the fuses for thesecables, along with alarm circuits for the incoming voltages and its own fuses.

Redundancy: 2n

Type: Functional Unit with no sub-units

Plug-in units: PDFU-A Power Distribution Fuse Unit

Interfaces: Supply interfaces to cartridges and site power system

Wired alarm Interface

To ensure 2n redundancy for the power distribution lines, the BSC3i cabinets areprovided with four PDFU-A units, which are located in the upper part of thecabinet and installed at the factory. Each PDFU-A forms an independent feedinginput branch consisting of:

. connectors and circuit breakers for the incoming power cables

. an integrated filter for EMC protection

. connectors for alarm and outgoing power cables

. eight fuses for outgoing distribution cables

. indicators for blown fuses.

The circuit breakers for the incoming power cables have a 20 A rating and thefuses for the outgoing distribution cables a 10 A rating (Use Nokia part withmanufacturer code 10511 20121).



73 (96)

Power Distribution Fuse Unit (PDFU-A) in the BSC3i

Figure 25. The four PDFU-A units at the top of the BSCC cabinet

Power supply to the cabinets

The power feed cables from the site power system to the BSCC cabinets areduplicated, with both supply lines connecting to all PDFU-As (0 3) in the BSCCcabinet. Each cabinet has supply cables of their own.

Power supply to the cartridges

On cabinet level, the operating voltages are fed to the cartridges housing thefunctional units backing up each other through separate distribution lines,following the principles listed below and illustrated in Figure Power distributiondiagram of the BSCC cabinet :

DN00294796

F0 F1 F2 F3 F4 F5 F6 F7

-UB 0

1 0

-UB 1

1 0

PDFU-A




. In some cartridges, each plug-in unit makes up a functional entity of itsown. These cartridges do not have any power supply plug-in unit. Instead,the plug-in units are equipped with onboard DC/DC converters, and onehalf of the cartridge is fed by one PDFU-Awhile the other half is fed by theother. In the figure, these types of cartridges are referred to as 'type 1'cartridges. They include the ET4C-B and CLOC-B cartridges.

. The other cartridges are each equipped with one power supply plug-in unitwhich feeds the other equipment in the cartridge. The redundancy of thepower feed is achieved by supplying functional units backing up each otherthrough separate PDFU-As. In the figure, these types of cartridges arereferred to as 'type 2' cartridges.

Figure 26. Power distribution diagram of the BSCC cabinet

~=

~=

~~~~ ~~~~

==

==

==

==

GROUNDBAR OFTHE SITE

TYPE 1

cartridge

TYPE 2

cartridge

DX 200CABINET(IC209-A)

TYPE 2

cartridge

RECTIFIERSYSTEMANDBATTERIES

PDFU-A0

PDFU-A1

PDFU-A2

PDFU-A3

DN01130697

+



75 (96)

Power Distribution Fuse Unit (PDFU-A) in the BSC3i

The principle of power supply to the BSCC cabinet is presented in Figure Powersupply to the BSCC cabinet .

Figure 27. Power supply to the BSCC cabinet

Power supply to the Fan Trays (FTRB units)

The BSCC cabinet is equipped with four Fan Trays (FTRB), each of whichcontains three fans. Each FTRB is powered by a separate PDFU-A. The fans are n+1/L redundant, meaning that if one of them fails, the remaining 11 fansautomatically start to operate at maximum speed, which is enough to providesufficient cooling.


BSCC

= Twin wires

PDFU-A0

PDFU-A1

PDFU-A2

PDFU-A3 R

ECTIFIERS

/BATTERIES

+UB/-UB0+UB/-UB1

DN0263946




15 Overview of the BSC3i installation site

This section briefly describes the equipment room layout and some basicrequirements for the premises. For further information on the cables and cablestructures, see the Installation Site Requirements for BSC3i .

15.1 Equipment room layout

Each cabinet should be located in the equipment room with free space of at least1000 mm (3.3 ft) both at the front and the back, and at least 500 mm (20 in)between the end of a cabinet row and the wall. The recommended space betweenthe cabinet rows is 1000 mm (3.3 ft) or, when the equipment room has a raisedfloor, 1200 mm (3.9 ft). Any deviations from the above must be agreed uponindividually.

In layout planning, the following aspects should be considered:

. cable structures for the power supply and PCM circuit cables

. room for expansion cabinets

. room for maintenance between two two-cabinet units with SCCs (when theequipment room has raised floor)

. free space above the cabinet rows (height at least 500 mm, or 20 in).

The measurements of the BSC3i and the required distances from the walls isshown in Figure Space requirements of the BSC3i network element .



77 (96)

Overview of the BSC3i installation site

Figure 28. Space requirements of the BSC3i network element

Note

When the equipment room has raised floor, a Side Cable Conduit (SCC) isconnected to each BSCC cabinet with four screws. The SCCs can be connected toeither side of the cabinet.

Layout examples of a BSC3i site

The BSC3i network element consists of one cabinet, the BSCC. Networkelements are installed in rows as shown in the following figures.

BSC3i500

450

WORKING AREA

1000

1000

600

900




Figure 29. Left-to-right configuration, an example

Figure 30. Right-to-left configuration, an example

DN01195477

BSCC6

BSCC7

BSCC1

BSCC2

1000

FRONT VIEW

900 900

4500

BSCC8

900

BSCC9

900

BSCC10

900

BSCC3

BSCC4

BSCC5

DN01195489

BSCC10

BSCC9

BSCC5

BSCC4

1000

FRONT VIEW

900 900

4500

BSCC8

900

BSCC7

900

BSCC6

900

BSCC3

BSCC2

BSCC1



79 (96)


Figure 31. Left-to-right configuration (raised floor), an example

Figure 32. Right-to-left configuration (raised floor), an example

Overview of the installation site

Cable structures and estimated power consumption

DN01195453

SCC BSCC

6

BSCC7 S

CC

SCC BSCC

(BSC3i)

BSCC(BSC3i) S

CC

SCC BSCC

8

BSCC9 S

CC

SCC BSCC

10

SCC BSCC

1

BSCC2 S

CC

SCC BSCC

(BSC3i)

BSCC(BSC3i) S

CC

SCC BSCC

3

BSCC4 S

CC

SCC BSCC

5

1200

450 450

450 450

FRONT VIEW

75

75

900 900

5775

1950

DN01195465

SCCBSCC

6

BSCC7S

CC

SCCBSCC

(BSC3i)SCC BSCC

8

BSCC9S

CCBSCC

10

SCCBSCC

1

BSCC2S

CC

SCCBSCC

(BSC3i)

BSCC(BSC3i)S

CC BSCC

3

BSCC4S

CCBSCC

5

1200

450450

450450

FRONT VIEW

75

75

900900

5775

1950




15.2 Cable structures and estimated powerconsumption

For further information on the cable structures, see Installation Site Requirements.

Cables of peripheral devices

The connectors for the VDUs and LPTs used for temporary service operations areon the front panels of the CPU plug-in units. The cables connect to RJ-45connectors.

The permanent VDU and LPT connections for monitoring the operations of theunits are made through the CPRJ45 connector panels in the BSCC cabinet.

PCM trunk distribution frame (DDF)

Distribution frames are not system-specific and are therefore not discussed inEngineering for BSC3i .

Cable trays

The DX 200 system construction does not comprise actual cable trays. The cablesupport construction arrangements for the external cables are decided upon by thecustomer individually.

Estimated power consumption

The estimated power consumption value for a fully equipped S11 first-deliveryBSC3i network element (one-cabinet configuration) is 1630 W .




81 (96)


16 Alarm system for BSC

The task of the alarm system is to process the alarm signals collected from theexchange and find the basic fault or disturbance behind the alarm condition. Thealarm system tries to localise the unit in which a disturbance or a fault has beengenerated, after which the appropriate automatic recovery functions can beactivated. The user is informed of failure conditions with alarm printouts andEXAU controls. The alarm system stores all alarm events on a disk. Alarmhistory stored on the disk can later be examined by means of the user terminal.

With the user interface, it is possible to cancel or block alarms, output alarmhistory, and change alarm-specific parameters and EXAU controls. See FigureImplementation model of the alarm system .

Figure 33. Implementation model of the alarm system

Alarm functions of the system include:

Nokia NetAct

DN9832859

Outside device

User interface

EXAU

Printer

VDU

TCSM2

Alarms

LAN or X.25 LAN or X.25

BSC

Alarm system,alarms from

BSC, BTS, TCSMand from external

sources

MSC



83 (96)

Alarm system for BSC

. collection of alarm data

. storing of alarm data

. output of alarms

. control of alarm printouts.

For a more general introduction to Engineering for BSC3i, see Overview ofEngineering for BSC3i .

16.1 Collection of alarms

The alarm data can be divided into the following subgroups:

. hardware alarms

. fault observations of the program blocks

. fault observations of the preprocessors.

All the fault observations and alarms of the exchange are saved in the log file ofthe alarm system.

Hardware alarms

Supervision logic has been integrated into some types of hardware. Thesupervision logic can inform the alarm system about malfunctions in thehardware. The following are devices of this type:

. power sources

. plug-in units which need basic timing signals for their timing.

In addition, the following are supervised by the hardware:

. fuses

. premises.

In the BSC systems, the hardware alarms of the cartridges are wired to the CLOCcartridge, from which they are relayed to the plug-in unit HWAT in the OMUcartridge. The alarms are transmitted to normal processing by the alarm systemfrom the HWAT by the software.




Fault observations of the software

The observations can be passing disturbances detected in the system, ON/OFF-type alarms, or updates of the error ratio counters. The error ratio counters areused to collect information about statistical errors.

Fault observations of the preprocessors

Each preprocessor supervises its own function and environment. The alarmsystem provides a service to the preprocessors by means of which they can sendtheir alarm data directly to the alarm system. The fault observations ofpreprocessors (AS7, for example) are transmitted to the alarm system through anapplication program block.


16.2 Alarms from the TCSM2

Alarms are transferred over the operation and maintenance link to the BSC.Current alarms can, however, be viewed on a local MMI terminal. For immediateunderstanding at a local MMI terminal, the TRCO software assigns a text stringto the alarms.

When the BSC receives alarms indicating that traffic channels, trunks or otherportions of the traffic capacity are lost, it immediately blocks the respectiveelements in its own system. The TCSM2 itself is not aware of the blockingmeasures taken by the BSC.


16.3 BTS alarm handling in the BSC

BTS alarm handling in the BSC collects various fault indications of the system,processes them and informs the user of the faults in actual alarm printouts.Moreover, the alarm handling system makes decisions on the basis of alarmindications and activates the radio network recovery when needed, so that theautomatic recovery actions will be started.

The received BTS alarms are stored in a disk file. The alarm history and thealarms currently on can be displayed with an MML command. The BTS alarmhandling MML also allows the user to change certain alarm parameters and tocancel alarms manually.



85 (96)


The alarm handling system receives alarm indications from the following sourcesin the radio network:

. alarms from the BTS equipment

. alarms from the BTS concerning the BTS software

. external alarms from the BTS site

. alarms concerning PCM lines in the radio network

. alarms from LAPD links on the A-bis interface

. alarms from A-bis interface equipment.

For information on the alarm print-outs, see alarm manuals.


16.4 BSS transmission equipment handling

When the equipment is located at a BTS site, the management commandsbetween BSC and BTS are sent via the LAPD based operation and maintenancelink. The OMU of the BTS forwards the commands to the managed equipmentvia the local Q1 bus. Possible equipment types at the BTS site are:

. Base Station Interface Equipment (BIE)

. Transmission Unit (TRU)

. Digital Microwave Radio Link (DMR).

Furthermore, four other pieces of transmission equipment (TE), for exampleOptical line equipment, can be connected to the local Q1 bus at the BTS site.


16.5 Nokia NetAct network management system

Nokia NetAct is a network and service management system, which providescentralised management functions for different network technologies and networkdomains. Nokia NetAct can manage both the network and the services in acentralised manner, meaning that the operator can view the network elementstatus, service quality indicators and traffic from a single screen. A network-wideview is always available.




A Unified Mediation and Adaptation layer (UMA) is the interface towards thedifferent network subsystems, such as the BSS. The UMA is responsible forcollecting data from the BSS, such as alarms, events, and measurements. Aunified adaptation to network elements and element managers makes it possibleto handle alarms and performance indicators in the same way regardless oftechnology or origin.

Nokia NetAct consists of functionality areas (for example, Monitor, Reporter, andPlanner), which provide management capabilities grouped together according tothe most relevant operator processes. For the BSS, there is an extensive set ofmanagement functionalities available, for example the following:

. monitoring

. reporting

. planning

. configuring and optimising

. system management

. service quality management.

The hardware solution of Nokia NetAct is built of one or more server clusters andoperator seats. Regional clusters manage a specific region, while global clustersare intended for centralised network management tasks. When distributing theoperations between regional and national management centres, the regional serverclusters and third party management systems are connected to the global clustervia a Data Communication Network (DCN). The hardware includes thefollowing:

. High-availability servers (HP-UX)

. Application servers (Windows and HP-UX)

. Operator seats

. Storage Area Network (SAN) with disk array

. DCN backbone.




87 (96)


16.6 EXAU

Nokia network elements can be equipped with an alarm unit to make the alarmmonitoring more efficient. The External Alarm Unit (EXAU) is a small devicecontrolled by the HWAT-A plug-in unit located in the network element. TheEXAU indicates alarms from the network element with indicator lights and abuzzer.

The EXAU panel consists of a base assembly and a cover assembly with acomponent board attached to it with three attachment pins. The component boardaccommodates also the power supply and alarm connectors. Functionally, theEXAU panel consists of the following blocks:

. component board (PCB) connected to the cover

. base frame for mounting on the wall

. alarm inputs, D25 connector on the component board

. six indicator LEDs connected to the component board

. buzzer mounted on the component board

. Test, Buzzer Reset and Silent Mode buttons connected to the componentboard

. power supply (-48 V).

Figure 34. Block diagram of the EXAU

LEDS BUZZER

CONTROL PCB

ALARM

INPUTS

POWER

SUPPLY

ACKNOWLEDGEMENT

SILENT MODE

TESTING

DN0274838




Alarms that activate the buzzer can be selected with DIP switch SW1. Thebuzzer, like the indicator LEDs, are connected to six alarm inputs. The buzzer canbe switched off by the silent mode button. The test cutton is used to test theoperation of the indicator LEDs and the buzzer.

Power is supplied via a protective switch SW2 and fuse F1. When the coverassembly is opened, the power supply to the EXAU unit is disconnected.




89 (96)


17 Synchronisation for BSCSynchronisation principles on the system level

The primary synchronisation method in the DX 200 network is based on the so-called master-slave principle. In this method, the network elements in a givennetwork are hierarchically organised in such a way that a network element on ahigher level in the hierarchy controls the synchronisation of network element(s)one step below it. A DX 200 network element which is synchronised to higherlevel equipment can, in turn, function as a synchronisation source for lower levelequipment. The synchronisation signals are transmitted through the PCM lines.

If the connection to the master equipment is broken, the DX 200 equipment cancontinue operation by switching into plesiochronous mode , that is by generatingtheir own basic frequency without an external synchronisation reference. Whenthe connection to the master equipment is restored, the equipment will re-synchronise to the synchronisation signal coming from the higher-level exchange.

Architecture of the DX 200 network synchronisation

The DX 200 cellular network synchronisation plan is usually designed in such away that one of the exchanges in a PSTN or an ISDN network functions as themaster exchange and supplies the synchronisation reference to the MSCs in thecellular network. The synchronisation signal is also fed to each MSC from one ormore other MSCs of the same network, to ensure the availability of thesynchronisation reference in case the connection to the PSTN/ISDN is disrupted.

The MSCs, in turn, supply the synchronisation reference to the HLRs of thenetwork, as well as to the BSCs via the TCSMs. To ensure redundancy, each HLRof the network receives the synchronisation reference from multiple MSCs, andeach BSC from multiple TCSMs. The redundancy of the synchronisationreference to the TCSMs and BSCs has been arranged by supplying each referencesignal through a separate PCM. The architecture of the network synchronisationsystem is depicted in Figure Synchronisation of the BSC .



91 (96)

Synchronisation for BSC

Figure 35. Synchronisation of the BSC

BSC1 BSC2 BSC3 BSC4

DN9832874

PSTN

MSC1 MSC2 MSC3

TCSMs 1-16

HLR

sync. in 1-4(for each TCSM unit)

sync. in 1-2 sync. in 1-2sync. in 1-2

sync. in 1-3sync. in 1-3

sync. in1-3

sync. in 1

sync. in 2

sync.in 3

sync. in 3-4sync. in 3-4




Note

In the configuration depicted in the picture, there are 16 separate transcoders inthe TCSM rack, each of which receives four synchronisation reference signalsfrom the MSC1.

Internal synchronisation of the BSC

Each DX 200 network element has an internal clock generator which receives thereference timing from external synchronisation sources (normally external PCMcircuits) and generates pairs of timing signals which are distributed to all otherplug-in units in the network element. In the BSC, each pair normally uses thefrequencies 8.192 MHz / 8 kHz.

The basic configuration of the BSC3i is one rack. In the CLOCB cartridge of thecabinet, two Clock and Tone Generator (CL3TG) plug-in units are positioned

Performance characteristics of the CL3TG are the following:

Stability (at temp. +5 °C / 41°F to40°C / 104°F)

< 3×10-7

Stability (due to ageing) < 5×10-9 /day

Accuracy after loss of externalsynchronisation

- initially: +/- 1×10-9

- after one day: +/- 2×10-8

Number of synchronisation inputs for CL3TG:

. four for PCM lines

. two external inputs (120 ohm balanced / 75 ohm unbalanced).

Line coding/decoding standards supported for PCM signals:

ETSI version: HDB3

ANSI version: AMI and B8ZS

Redundancy 2n



93 (96)

Synchronisation for BSC

Note

The PCM cables carrying the synchronisation signal connect to ET2 plug-in unitspowered by different power supplies in order to ensure redundancy of the powersupply.

For a more general introduction to Engineering for BSC3i, see Overview ofEngineering for BSC3i




18 Management network topology for BSC

Nokia NetAct offers standard interfaces towards the network elements, thehigher-level network management system and the administrative systems . SeeFigure Nokia NetAct system interfaces (BSS includes BSC, TCSM2,transmission equipment and BTS) .

Figure 36. Nokia NetAct system interfaces (BSS includes BSC, TCSM2,transmission equipment and BTS)

Nokia NetAct supports the following physical interfaces:

. X.25 via packet switched network (analog connection)

. X.25 via time slots reserved from a semipermanently connected PCM link(digital connection)

. LAN.

MSC BSSHLR

MSC

BSS PSPDN

X.25 orLAN

X.25leased line

X.25 orLAN

64 kbit/s timeslot reserved for O&M

X.25 orLAN

DN9834272

NokiaNetAct

NMC

X.25 orLAN



95 (96)

Management network topology for BSC

The operation and maintenance interfaces between the Nokia NetAct and thenetwork elements follow the principles described in the GSM Recommendation12.01. The protocol stack is implemented in the Nokia NetAct for communicationbetween the Nokia NetAct and the network elements.

Remote terminal sessions can be established from the Nokia NetAct to the DX200 network elements (BSC, TCSM2 MSC). The PAD (Packet Assembly/Disassembly, X.29) protocol over the X.25 connections is used for the remoteterminal.

Interface towards the Base Station Subsystem

The interface between the Nokia NetAct and the Base Station Subsystem (theBSS) uses the X.25 or LAN connection. The management protocol stack in theBSS follows the principles described in the GSM Recommendations 12.01 and08.09.

The network management applications in the BSS and in the Nokia NetAct usethe File Transfer Access Method (FTAM) for file transfer. The CommonManagement Information Protocol (CMIP) is used for other networkmanagement purposes. Some applications use a remote MMI, that is, the networkelement's local commands are given from a remote site.

The operation and maintenance network is connected to the time slots of the PCMcircuit by means of the signalling interface adapter (AS7). To ensure redundancy,a spare time slot can also be allocated for the operation and maintenanceconnections, which is taken into use when the connection through the main timeslot is disrupted.

Interface to the switching subsystem

The interface between the Nokia NetAct and the switching subsystem (MSC/VLR and HLR/AC/EIR) uses the X.25 or LAN connection and the PAD (PacketAssembly/Disassembly, X.29). The switching subsystem is controlled from theNetAct with a remote MML via the PAD. The switching elements send reportsand other output to the NetAct via a Nokia proprietary protocol on top of theX.25. These outputs can be forwarded to output devices or applications in theNetAct.

The management protocol stack is also implemented in the switching subsystemelements. The FTAM can be used for transferring files between the NetAct andthe switching subsystem elements.

For a more general introduction to Engineering for BSC3i, see Overview ofEngineering for BSC3i .




nokia engineering bsc3i

Documents