03_RN28193EN20GLA0_Flexi BSC Architecture and Interface

RN28193EN20GLA0

Flexi BSC Architecture and Interfaces

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Soc Classification level RN28193EN20GLA01 © Nokia Siemens Networks

Flexi BSC Architecture and InterfacesRG20 (BSS)

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After this module you should be able to:• Explain the architecture and capacity of NSN Flexi BSC Family (BSC3i 660, BSC3i 1000/2000, and

Flexi BSC)

• Explain unit functions of switching unit, computer units (MCMU, BCSU and OMU) and PCU

• Describe the synchronization and internal LAN within Flexi BSC

• Describe Flexi BSC interfaces units: ET,SET,EET and ETIP/ETP for IP/Ethernet

• Explain the other units related to mass memory storage (WDU), removable storage (MO, USB), I/O devices (VDU, LPT), Power distribution (PDFU) and Fan units.

• Explain the capacity of TRX, SS7 & LAPD signalling, packet channels, and capacity upgrade in BSC type variants

• Apply MML command to interrogate BSC hardware database

• Interpret the information for when do hardware interrogation

• Demonstrate to check the unit state with MML command

• Interpret the capacity of AS7 plug-in unit related to SS7, LAPD channels

• Interpret the capacity of PCU related to Gb interface and Abis interface for packet data channels

Objectives

Refer to S15 Documentation:

BSC/TCSM descriptions\ Product description of BSC2i and BSCi HighCapacity Base Station Controller

BSC/TCSM descriptions \ Product description of BSC3i High CapacityBase Station Controller

BSC/TCSM descriptions \ Product description of Flexi BSC

BSC/TCSM descriptions \ Product description of TCSM2A and TCSM2E

BSC/TCSM descriptions \ Product description of TCSM3i High CapacityTranscoder Multiplexer

Required equipment: One working VDU terminal for each work group.

Note:

This document consists of different BSC types and there architecture. The slides could be selected depending on customer needs

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RG20 (BSS) Compatibility Matrix

The standardization baseline of RG20 release is 3GPP Release 8 meeting #41.

The compatibility of RG20 System Release for individual network element (NE) releases are as follows:

• RG20 consists of the releases:– BSC S15, MetroSite CXM8.0, UltraSite CX8.0, FlexiEDGE

EX4.0, BTSPlus BRG2.

• RG20 is supported by the following NE releases:– NetAct OSS5.2 CD set 3, MSC M15, and SGSN SG8

The BSCi / BSC2i / TCSM2 and Talk Family BTS systems are compatible (supported) by the RG20 (BSS) Release. Also, the new RG20 (BSS) features are not supported by the Transcoder TCSM2 and Talk Family BTSs.

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BSC Product Naming on S15 level

3000 TRX one cabinet configuration (RG10)

4200 TRX one cabinet configuration (RG20)

Flexi BSC

BSC = Base Station Controller, a general term for all BSC versions

1000 TRX one cabinet or 2000 TRX two cabinet configuration, upgradeable to Flexi BSC

BSC3i 1000/2000

660 TRX one cabinet configuration, upgradeable to Flexi BSC

BSC3i 660Flexi BSC product family

High Capacity version of the second generation Nokia DX 200 BSC2

BSC2i

High Capacity (upgraded) version of the first generation Nokia DX 200 BSC (BSCE)

BSCiBSCi/2i

ExplanationProduct nameGeneral name

• Flexi BSC product family is a general term for all BSCs upgradeable to Flexi BSC configuration

• Flexi BSC as product name is specific for the 3000/4200 TRX one cabinet product/configuration

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RG20 (BSS) BSC Hardware Requirements

• RG20 (BSS) Software supports Flexi BSC Family (Flexi BSC, BSC3i 1000/2000and BSC3i 660), BSC2i, and BSCi.

• Some functionality (such as ETP/ETP-A Plug-in unit for Packet Abis and A Over IP) will be available only for Flexi BSC, BSC3i 1000/2000

• The RG20 (BSS) Release sets the same mandatory minimum hardware:

• Memory requirement (as per the RG10 (BSS) Release) :

– Flexi BSC3 1 GB in MCMU, BCSU and OMU.

– BSC3i 660 and 1000/2000: 512 MB in BCSU, 1 GB in MCMU and OMU.

– BSCi and BSC2i: 512 MB in OMU, MCMU and BCSU.

• Minimum Hard Disk (as per the BSS13 and RG10 (BSS) release) :

– 4GB in BSCi and BSC2i product and in minimum 9GB in BSC3i

• Typical minimum O&M Link Capacity requirements (as per BSS13 and the RG10 (BSS) release) :

– BSC3i 2000: minimum 1024 kbit/s, recommended 2048 kbit/s

– BSC3i 1000: minimum 512 kbit/s, recommended 1024 kbit/s

– BSCi, BSC2i, BSC3i 660: minimum 256 kbit/s, recommended 512 kbit/s.

RG20 (BSS) BSC hardware Requirements

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RG20 (BSS) TCSM Hardware Requirements

• RG20 (BSS) Software supports the TCSM3i and TCMS2.

• New transcoding related Application SW in RG20 (BSS) will be supported only by TCSM3i.

RG20 (BSS) TCSM hardware Requirements

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RG20 (BSS) PCU Hardware Requirements

• RG20 (BSS) Software supports the PCU1 and PCU2.

• PCU2 Plug-in Unit is mandatory hardware requirements for following new RG20 (BSS) new Packet Data application software product:

RG20 (BSS) PCU hardware Requirements

• BSS21343 DLDC Territory Procedure

• BSS21392 TRX Specific Link Adaptation for DLDC

• BSS20083 Inter-BSC NACC

• BSS21045 Inter System NACC

• BSS21355 Inter System NACC for LTE

• RG301397 Cositing with BS2xx

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Switching Platform

Computing platform

General BSC Block Diagram

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General BSC Block Diagram

• GSW: Group Switch• Switching of internal and external PCM’s

• ET: Exchange Terminals• Adapts the external PCM circuits to the GSW

• CLS: Clock and Synchronization unit• Distributes timing reference signals to the functional units of the BSC

Switching Platform:

• OMU: Operation and Maintenance Unit• Maintenance functions

• User interface

• I/O device handling

• BCSU: BSC Signalling Unit• Handles signalling links on A and Abis interfaces

• Houses the PCU, that implements PS services in the BSC

• MCMU: Clock and Synchronization unit• Controls and supervises the GSW

Computing Platform:

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Flexi BSC Block Diagram


BSC/TCSM descriptions\ BSC/TCSM hardware descriptions\Engineering for Flexi BSC

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Flexi BSC Product Highlights - RG20The World’s most powerful GSM/EDGE BSC

Highest circuit-switched capacity for voice• Market-leading over 25,000 Erlangs from 4,200 TRXsVery high packet data capacity for EDGE evolution• Up to 30,720 channelsVery high footprint efficiency• Low site-space costs thanks to 4,200 TRXs in one cabinetExcellent power consumption efficiency• Market-leading power consumption per capacitySupport for most cost-efficient transport options• IP/Ethernet for all interfaces• Packet Abis and A over IP for additional efficiency• Full flexibility to configure preferred or mixed integrated

transmission type (E1/T1, STM-1/OC-3, IP/Ethernet)Scalability• Capacity and transmission can be flexibly configured in small

resolution steps to support pay-as-you-grow approachHigh reliability• Redundancy, fault management and overload protection on top

of very high availability designProtected investment with strong evolution path• Flexi BSC module extension with Multicontroller BSC• Upgrade path for installed BSC3is to Flexi BSC

Up to 4200 TRXsOver 25 000 Erl

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Flexi BSC Capacity Evolution

• 3,000 TRXs in RG10

Flexi BSC with 3000 TRX

RG10/2009

• 4,200 TRXs in RG20

Flexi BSC with 4200 TRX

RG20/2010

Higher capacity supported with new Intel CPU card:

• CP816 for 3000 TRXs

• CP1D-A for 4200 TRXs

• Otherwise exactly the same hardware in RG20

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Flexi BSC Capacity Evolution (RG20) New Central Processing Unit CP1D-A

• The Central Processor of 1st Dual core generation implemented using a Penryn SP9300 processor.

• Supports SMP (Symmetrical Multiprocessing). A processor architecture in which multiple CPUs share the same memory. None of the processors is in a special role (e.g. every processor can handle any interruption, can schedule processes and can run any scheduled process).

Characteristic

• Processor core speed 2.26 GHz max.• Memory size 8GB ( with 2GB dims)• PCI 33/32,PCI Express x4• ETH 4x1000Mbit/s• One USB 2.0 on front panel• 1GB USB NAND flash module• CPCI 33Mhz,64bits

Main Features

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Flexi BSC Cabinet Configuration Computer Units

MCMUMCMU

BCSUBCSU

OMUOMU

MC

MU

MC

MU

OMUOMU

BCSUBCSUBCSUBCSU BCSUBCSU


Flexi BSC cabinet Flexi BSC cabinet

In the Flexi BSC, the call control functions are executed by micro-computers, called

Call Control Computers

MC

MU

MC

MU

BCSUBCSU

2000 x 900 x 600 cabinet (HxWxD)

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MCMU- Marker and Cellular Management Unit

• The Marker and Cellular Management Unit (MCMU) controls and supervises the Bit Group Switch and performs the hunting, connecting and releasing of the switching network circuits.

• The cellular management functions of the MCMU are responsible for cells and radio channels that are controlled by the BSC. The MCMU reserves and keeps track of the radio resources requested by the MSC and the handover procedures of the BSC.

• MCMU also manages the configuration of the cellular network.

• Redundancy 2N

MCMUMCMU

Plug-in units

• CP1D-A

• SWPRO-C

• ESB24-D

• PSC6-AB

MC

MU

MC

MU

MC

MU

MC

MU

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Flexi BSC Hardware and Functionality New SWPRO-C

• The SWPRO-C plug-in unit is used as a control unit for a bit-oriented group switch (GSWB).

• The GSWB control unit functionality provides two control bus interfaces through the backplane connection.

• Processor Intel Celeron 1.0 GHz, 400 MHz with SDRAM: 1 GB (with x8 memory configuration)

• SWPRO-C allows to control higher amount of connections and generates less load to the MCMU CPU in comparison to SWCOP-A

PDFU PDFU

BCSU 1

CL

S

GSW2KB

GSW2KB

CL

S

LA

NU

L

AN

U

FTRB FTRB

Flexi BSC

GTIC

GTIC

ETC

ETC ETC

ETC

BCSU

BCSU 2 BCSU 3

BCSU 5BCSU 4 BCSU 6

FTRB FTRB

MC

MU

MC

MU

OMU

SWPRO-C

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BCSU- BSC Signalling Unit

• The BSC Signalling Unit (BCSU) performs those BSC functions that are highly dependent on the volume of traffic.

• Consists of two parts, which correspond to the A and Abis interfaces

• Packet Control Units (PCUs) are housed in the same cartridge.

• The A interface part of the BCSU is responsible for performing all message handling and processing functions of the signalling channels connected to it

• Performing the distributed functions of the Message Transfer Part (MTP) and the Signalling Connection Control Part (SCCP) of SS7

• Controlling the mobile and base station signalling (Base Station Subsystem Application Part, BSSAP)

• The Abis interface part of the BCSU controls the air interface channels associated with transceivers (TRXs) and Abis signalling channels.

• The handover and power control algorithms reside in this functional unit.

• Redundancy N + 1

BCSUBCSU

Plug-in units

• CP1D-A

• AS7-D

• PCU2-E

• PSC6-D



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Flexi BSC Hardware and Functionality New AS7-D (1/2)

- The AS7 plug-in unit function as a general purpose peripheral slot computing engine

- 512 HDLC channels (2x that of AS7-C), 8x more memory, data processing performance is estimated to be ~1.4x that of AS7-C

- an interface to OMC (X.25), then it is installed in OMU.

- Processor and capacity Performance:- Processor: Intel Celeron M ULV 1.0 GHz, 400

MHz FSB (Data quad pumped, 3.2 GB/s).- L1 Instruction cache: 32 kB

§ L1 Write Back Data Cache: 32 kB

§ L2 Cache: 512 kB

- Memory::SDRAM: 1 GB

- Capacity:§ Channels: 512

§ 2M PCMs: 16 (32)

PDFU PDFU

BCSU 1

CL

S

GSW2KB

GSW2KB

CL

S

LA

NU

L

AN

U

FTRB FTRB

Flexi BSC

GTIC

GTIC

ETC

ETC ETC

ETC

BCSU

BCSU 2 BCSU 3

BCSU 5BCSU 4 BCSU 6

FTRB FTRB

MC

MU

MC

MU

OMU

AS7-D PIU

Compare to AS7-B:

Processor : Intel Mobile Celeron 650 MHz, 100 MHz FSB (800 MB/s)

L1 Instruction cache: 16 kB

L1 Write Back Data Cache: 16 kB

L2 Cache: 256 kB

Memory : SDRAM: 128/256 MB

Capacity:

Channels: 256

2M PCMs: 10

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Flexi BSC Hardware and Functionality New AS7-D (2/2)AS7_D 14 TRACK: 8

MS:FA000000 ME:FBFFFFFF IS:E240 IE:E27F INT:20H SW:0649005E

TSLS 30 20 10 0LAPD 8M PCM: 400 B 11111111111111111111111111111111

R 11111111111111111111111111111111 CONNECTOR SIDE: HOR: VER: POINT: 1

LAPD 8M PCM: 401 B 11111111111111111111111111111111R 11111111111111111111111111111111

CONNECTOR SIDE: HOR: VER: POINT: 1

LAPD 8M PCM: 402 B 11111111111111111111111111111111R 11111111111111111111111111111111


LAPD 8M PCM: 403 B 11111111111111111111111111111111R 11111111111111111111111111111111


LAPD 8M PCM: 404 B 11111111111111111111111111111111R 11111111111111111111111111111111


………

LAPD 8M PCM: 415 B 11111111111111111111111111111111R 11111111111111111111111111111111


AS7_D 13 TRACK: 7MS:F8000000 ME:F9FFFFFF IS:E200 IE:E23F INT:22H SW:0649005C

TSLS 30 20 10 0CCS7 8M PCM: 416 B 11111111111111111111111111111111

R 11111111111111111111111111111111 CONNECTOR SIDE: HOR: VER: POINT: 1

LAPD 8M PCM: 418 B 11111111111111111111111111111111R 11111111111111111111111111111111


LAPD 8M PCM: 419 B 11111111111111111111111111111111R 11111111111111111111111111111111


LAPD 8M PCM: 420 B 11111111111111111111111111111111R 11111111111111111111111111111111


……….

LAPD 8M PCM: 431 B 11111111111111111111111111111111R 11111111111111111111111111111111


Above is example of internal PCM connection for BCSU-1:On track 8 : PCM 400 – PCM 415 (16 PCMs) all TSL (0-31) used for LAPD

On track 7 : PCM 416 (1 PCM) all TSL (0-31) used for SS7, PCM 418-431 (14 PCM) all TSL (0-31) used for LAPD

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OMU- Operating and Maintenance Unit

• OMU is an interface between the BSC and a higher-level network management system and/or the user. The OMU receives fault indications. It can produce local alarm printouts to the user or send the fault indications to NetAct

• In a fault situation, the OMU automatically activates appropriate recovery and diagnostics procedures. Recovery can also be activated by the MCMU if the OMU is lost.

• The OMU consists of microcomputers and contains I/O interfaces for local operation.

• The tasks of the OMU can be divided into five groups:

• traffic measurement functions

• maintenance functions

• system configuration administration functions

• system management functions

• LAN topology management

OMUOMU

OMUOMUPlug-in units

•CP1D-A

•AS7-D

•HWAT-B

•SERO-B

•PSC6-AB

Mass memory adapter:

• DCAR1-A

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NetAct link options in Flexi BSC

LAN (Ethernet) interface• LAN Ethernet interface according to IEEE802.3 for

faster access

• This is the default NetAct link interface

• Connected via CPRJ45 panel on top of the cabinet

Digital X.25 interface, AS7-D (PCM time-slot-based O & M interface via A Interface, G.703)

• An O&M interface via transcoders and transmission equipment

• Network management interfaces in PCM time slots

• Should be used only if LAN is not available

The LAN interface redundancy is implemented by providing a redundant LAN connection

The digital X.25 interface can optionally be redundant by using duplicated units

The BSC has an X.25 and a LAN connection to the Nokia NetAct Operations Support System (OSS). The interface between these two network elements is based on the OSI protocol. Nokia NetAct interface plug-in unit are housed either with AS7 plug-in units or with AC25 plug-in unit. LAN/Ethernet connection is always available in default BSC configuration via connector panel with CPU in OMU.

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Flexi BSC Mass memories

Hard Disk UnitsDuplicated Hard disk units are installed with carrier adapter per BSC to ensure high reliability

Easy to change or upgrade without traffic interruption

USB memory stick interfaceUSB memory stick will provide reliable means for backup copying SW and database on a transferable media in BSC

Recommended solution for SW backups and for other additional disk storage

Easy, practical and fast to use compared to diskettes or DAT tape:

More reliable compared to Cartridge Tape (DAT) units

Media is more durable (compare Tape against CD-Rom)

MO has better heat endurance

MO is fast especially due to random Access -> Information can be read from media very fast

Maintenance is easier than with existing DAT solution

Drive and media has simple mechanical structure

Media is long-lasting

Disk drive is maintenance free

It is recommended that disk is cleaned at least every third month

BSC MO disk require correct MO disk adapter to be used. Currently ODPU-A adapter is accepted in BSC3i. Accepted units are updated in BSC HW Revisionlist document.

MO 91 specifications:

Manufacturer: Sony

Model: SMO-F561-70 (Nokia Specific equipment)

Unformatted Capacity: 9.1GB (4.5GB/side)

Standards: SCSI-2

Rotational speed: 3000 rpm

Seek time (ms): min 2, ave 25, max 45

Internal transfer rate: 3.07 – 6.14 MB/s

SCSI transfer rate: async 3MB/s, sync 20 MB/s

Buffer size: 8 Mbyte

Rewritable media

Unformatted capacity of MO91 is 4.5GB per side of the media. Total unformatted capacity is 9.1GB. The drive has read/write head only on side of the media. So disk needs to be turned around manually. Information is saved to the disk using MSDOS/FAT 16 or MSDOS/FAT 32 format.

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Flexi BSC Hardware and FunctionalityDCAR1-A Plug in Unit

USB port in DCAR1-APIU• USB memory stick will provide

reliable means for backup copying SW and database on a transferable media in BSC

• Capacity of memory stick is 4 GB

HDSAM (contained HSD07) also in DCAR1-A PIU• Duplicated Hard disk units are

installed with carrier adapter per BSC to ensure high reliability

• Easy to change or upgrade without traffic interruption

• Capacity of HSD07 is 73 GB

LED indicator on DCAR1A :

green normal operation

red failure conditionHard disk AMC front panel

(HDSAM-A)

Red - out of Service

green – Power good

Blue – Hot Swap

amber – hard disk drve activity

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Flexi BSC Capacity Evolution on RG20

• Flexi BSC, which was introduced with RG10 (BSS) Release, is designed to provide a leading capacity, low power consumption and is fully flexible in capacity and connectivity dimensions.

• With RG20 (BSS) release, there will be 4200 TRX capacity with 25000 Erlang from the same cabinet than BSC3i 660 in S11.5, BSC3i 1000 in S12 and Flexi BSC (S14) in S14 release.

• Cabinet configuration will be flexible from 700 TRX to 4200 TRX in 6 capacity steps

• New CPU unit in OMU, MCMU and BCSU of Flexi BSC: CP1D-A

MC

MU

MC

MU

OMUOMU



MC

MU

MC

MU

BCSUBCSUThe CP816 PIUs(in S14) are replaced with new CP1D-A PIUs (in S15) on each Computer Unit (BCSU, MCMU, OMU)

Summary:

The Flexi BSC was introduced with the RG10 (BSS) Release to complement the existing members of the Flexi BSC product family - The BSC3i 660 and the BSC3i 1000/2000.

The Flexi BSC is designed to provide both a leading capacity and low power consumption in a single cabinet solution and is fully flexible in capacity and connectivity dimensioning.

With the RG20 (BSS) Release, this evolution is continued through the introduction of a new Intel CPU enabling the capacity to be further extended to support up to 4200 TRXsin one single cabinet.

Benefits for the Operator:

Every aspect of the Flexi BSC contributes to its high operational efficiency.

The solution offers a unique level of capacity efficiency - being the only BSC in the marketplace to support up to 4200 TRXs in one cabinet, whilst providing the highest traffic handling capacity of 25000 Erlang.

Additionally, it offers a new level of efficiency in transmission, through enabling the Packet Abis and A over IP functions through the new ETP / ETP-A modules - which can be also be used in the BSC3i 1000/2000 and TCSM3i.

The Flexi BSC, through offering full flexibility in configuration for different transmission media will enable the operator to realise the most cost efficient solution for their requirements.

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Flexi BSC cabinet Flexi BSC cabinet

Flexi BSC Cartridges (Other Units)

LANULANU

GSW2KBGSW2KB

GTICGTIC

CLOCCLOC ETCETC

GS

W2K

BG

SW

2KB

GS

W2K

BG

SW

2KB

LA

NU

LA

NU

LA

NU

LA

NU

CL

OC

CL

OC

CL

OC

CL

OC

ET

CE

TC

ET

CE

TC

GT

ICG

TIC

GT

ICG

TIC

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Flexi BSC Group Switch GSW2KB

• Conveys the traffic passing through the BSC

• Establishes needed connections to the signalling units and the internal data transmission channels

• Internal connections to ET16 via back panel and ETS2/ETIP1-A via front panel

• Is responsible for the submultiplexingfunctions of the BSC

Configuration includes 8 x SW256B plug-in units

The duplicated Group Switch (GSWB) 256 is the switching fabric of the BSC3i. The GSWB is housed in two identical SW1C-C cartridges, and it conveys the traffic passing through the BSC3i and switches the tones to the subscribers of the exchange and to the trunk circuits. It also establishes the needed connections to the signalling units and the internal data transmission channels, and is responsible for the submultiplexing functions of the BSC3i.

The operation of the GSWB is controlled and supervised by the Marker and Cellular Management 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

The dimensions of an SW1C-C cartridge are (height x width): 270 mm x 198 mm

The dimensions of the plug-in units are (height x width): 233.4 mm x 220 mm; or

9.19 in x 8.66 in.

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Flexi BSC Hardware and FunctionalitySW256B PIU

• The GSW2KB is a congestion-free, full availability single-step switching network based on time-space architecture.

• The maximum capacity of GSW2KB related hardware is 2048 PCM lines, which realized by having 8 x SW256B piu.

• Interfaces:

- 64x8Mbit/s serial interface OR

- 32x4Mbit/s,32 x8Mbit/s serial interfaces OR

- 64x4Mbit/s serial interface

- 4 x 2N redundant Serial Broadband Interface (SBI) 524 MBit /s for connecting the Hotlink from SET/ETIP

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Flexi BSC Clock unit

• Clock and Tone Generator (CL3TG-UA) plug-in units generates the basic timing signals needed by the exchange, either independently or synchronized to a frame alignment signal received from the Exchange Terminal (ET) or external Frequency Standard (FS).

• Number of synchronization inputs: four from PCM (ET), and two from expernal input (FS) via connector panel

• Housed in the SGC1C-A cartridge

2 x CL3TG units(2N redundancy)

The CLS generates the clock signals necessary for the BSC. The oscillator of the CLS is normally synchronized to an external source, usually an MSC, through a PCM line. Up to three additional PCM inputs are provided for redundancy.

Plug-in Unit: CL3TG (Clock and Tone Generator)

Interfaces:

- Synchronization input from Transcoder

- External synchronization input

- Synchronization output

- Wired alarm interface to OMU via GSWB

The Clock&Tone Generator (CL3TG) plug-in unit meets the requirements of the ITU-T Q.500 Series Recommendation with respect to the Time Interval Error (TIE), the jitter, the wander, and the transfer function. In the plesiochronous operation mode, the frequency shift of the CL3TG is 5 * 10-9 within each 24-hour period, if the temperature of the environment does not vary. CL3TG with external synchronised input is available by using the external synchronisation input connector from the CPRJ45 panel. It can be implemented either by symmetrical or asymmetrical PCM connection (RJ45 or BNC connector).

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Flexi BSC ET units

ETC 0-4GTIC 0-1

ETC 0-4 and GTIC 0-1

• Provides the external PCM line connections for BSC

• Each ET16 plug-in units contain 16 separate PCMs (E1/T1)

• Only one ET16 plug-in unit type

• Interface specific characteristics are changed with cabling and cabling panels

• Flexi BSC includes in maximum 50 ET16 units providing 800 external PCMs (E1/T1)

The ETs are housed in ET4C-B cartridges. One ET4C-B cartridge can contain up to 32 ET2E-S, ET2E-SC or ET2A 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 of PCMs is 124.

The ET2 plug-in units are installed in the order presented in the Equipment list in the site documents. The ET2E plug-in unit connects BSC to a 2.048 Mbit/s PCM transmission system. The ET2E is equipped with two PCM circuit interfaces (2x2M).

Different connector types used in ET2-units are following:

• ET2E-S Exchange Terminal with Euroconnector (balanced E1interface, 120 ohm) in ETSI environment

• ET2E-SC Exchange Terminal with coaxial connectors (unbalanced E1 interface, 75 ohm) in ETSI environment

• ET2A Exchange Terminal with RJ-45 connectors (balanced T1 interface) in ANSI environment

The dimensions of a ET4C cartridges are (height x width): 270 mm x 360 mm

The dimensions of the ET2 plug-in units are (height x depth): 100 mm x 220 mm; or 3.94 x 8.66 in.

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Flexi BSC SET units

• Provides the external SDH / Sonet line connections for BSC

• Each ETS2 plug-in units contain two separate STM-1 / OC-3 interfaces

• Flexi BSC includes in maximum 2 x 8 ETS2 units providing 16 external interfaces (STM-1/OC-3)

• ETIP1-A/ET16 units can be equipped to the same cartridge alternatively

0 - 18 x ETS2 units0 - 18 x ETIP1-A units0 - 17 x ET16 units









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Flexi BSC EET units for CESoPSN*

• Provides the external GigE Ethernet line connections for BSC

• Each ETIP1-A plug-in units contain one IP interfaces

• Flexi BSC includes in maximum 2 x 8 ETIP1-A units providing 8 redundant external interfaces (GigE)

• ETS2/ET16 units can be equipped to the same cartridge alternatively

0 - 18 x ETS2 units0 - 18 x ETIP1-A units0 - 17 x ET16 units

*Circuit Emulation Service over Packet Switched Networks









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Flexi BSC ETP/ETP-A units

• Provides the Gigabit Ethernet interface for Packet Abis (ETP) and A over IP (ETP-A).

• Each ETP plug-in unit contains 1 external Ethernet interface comprising 2 redundant SFP modules.

• Depending on the A over IP scenario, ETP-A is located either in TCSM3i or BSC.

• When installed in the BSC, ETP plug-in units can be plugged in the GTIC and ETC cartridges.









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Main interfaces of ETP and ETP-A units

1 + 1 GigEExternal interface

ETP

ETP-A

Hotlinks for GSWB i/f

Internal interface

Ethernet for LANU i/f

Internal interface

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External interface options with SFP modules

ETP / ETP-AGiga Ethernet

Electrical SFP GigE, RJ45 CAT5Twisted pair copper, short haul, 100m

Optical SFP GigE, LC SXMultimode fiber, short haul, 500m

Optical SFP GigE, LC LX (coming soon)Single mode fiber, long haul, 5km

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Flexi BSC IP/Ethernet InterfacesETIP1-A (PWE/CESoPSN), ETP (Packet Abis), ETP-A (A over IP)

Ater (CESoPSN)

ETIP1-A1+1 x GigE(CESoPSN)

Optical short haul

or copper SFP module

A over IP

Packet Abis (Eth)

A (CESoPSN)

ETP 1+1 x GigE

Optical short haulor copper SFP

module

ETP-A 1+1 x GigEOptical short

haulor copper SFP

module

Packet Abis (TDM)

ETS22 x STM-1

Optical long haul SFP modules

Abis (CESoPSN)

ETP

1+1 x Gigabit Ethernet port (SFP module)

Optical SFP GigE, LC SX – short haul

Electrical SFP GigE, RJ45 CAT5

Packet Abis

Packet Abis over TDM (MLPPP)

Together with ETS2

Synchronization Options:

Synchronous Ethernet

Timing over Packet (IEEE1588v2)

ETP-A

Same capabilities as ETP, but is used for A over IP

in BSC (if Transcoder in MGW)

in TCSM3i (if Transcoder in BSS)

Hot standby redundant units applied for equipment protection

Additionally ETP-A cards require SFP modules, either electrical or optical

always two per card

Electrical SFP GigE, RJ45 CAT5 (sales item BSC3222)

Optical SFP GigE, LC SX (sales item BSC3214)

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Flexi BSC PCU Solution

Controls (E)GPRS radio resources and acts as the key unit in thefollowing procedures

• (E)GPRS Radio resource allocation and management• (E)GPRS radio connection establishment and management• Data transfer• Coding scheme selection• PCU statistics

Independent processing unit, embedded in BCSUs of BSC for redundancy purposes

• Takes advantage of BSCs O&M and overload protection mechanisms

Provides flexible choices for transport method between BSC and SGSN

• IP and Frame Relay as transport alternatives for Gb - Interface

PCU - Packet Control Unit - a functional unit in Base Station Controller (BSC)

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PCU2 – Embedded in BCSUs of Flexi BSCFlexible capacity extensions according to traffic needs

• Configured into BCSUs according to traffic requirements– Up to 5 PCU2-E plug-in units per BCSU

– Asymmetrical PCU HW configuration allows PCU2-E HW installation in granularity of one

• Flexible and smooth capacity activation according to traffic requirements– PCU2-Es are SW activated with license keys in granularity of 256

Abis channels

Up to 30 x 1,024Up to 30 x 1,024Up to 30 x 384

Abis ChannelsTRX ObjectsBTS Objects

PDFU 0 PDFU 1

BCSU 3BCSU 1 BCSU 5

BCSU 4BCSU 2 BCSU 6

FTRB 3FTRB 2

CL

S 1

GSW2KB-A1

OMUBCSU 0

MC

MU

0

MC

MU

1

GSW2KB-A0

GTIC1

GTIC0

CL

S 0

ETC0

ETC1

ETC2

ETC3

LA

NU

0L

AN

U 1

FTRB 1FTRB 0

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Flexi BSC LANU units

2N redundant LANU unit in basic cabinet• Contains 3 ESB24-D PIUs

For BSC3i 1000/2000, there’s another 2N redundant LANU unit in extension cabinet• Only if more than 6

working BCSU’s in use• Extension to LANU in

basic cabinet• Contains 1 ESB unit

In the BSCC cabinet, LAN switches are used to collect CPU LANs to and from computerunits and PCU LANs to and from BCSU cartridges.

In the BSCC cabinet, there are two LANU parts in diffrerent BC1C-B cartridges. LANU 0 and LANU 1 are equipped with three ESB24-D plug-in units and a power unit PSC6-CB

ESB24-D switching unit with:

4 SFP type ports in the front panel (for optical and electrical RJ45 transceivers and SFP DA transceivers)

20 full duplex Ethernet ports in the back plane (type 10/100/1000Base-T/TX/T)

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Flexi BSC SWU units

• Each ESB card in the LANU is considered a Switching Unit (SWU)

• The SWU’s switch traffic from user plane (e.g. Gb over IP), control plane (e.g. SIGTRAN on A-IF) and management plane (e.g. Q3 IF to NetAct)

• The first SWU of the LANU cartridge is connected to the CPU’s of the BSC computing units (OMU, MCMU’s and BCSU’s)

• Second and third SWU’s are connected to the PCU’s


BSC/TCSM descriptions\ Product description of Flexi BSC\ Architectureof the Flexi BSC\ LAN Switch Units

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ESB24-D Ethernet Switches

• Used in Flexi BSC for EMB and IP LAN switching

• ESB unit located in MCMU is used for EMB switching• Connects all CPU’s

• ESB units located in LANU are used for IP LAN Switching• 3 in base cabinet LANU

• Connects together all CPU’s and all PCU’s

LANULANUMCMUMCMU

ESB24-D is the integrated IP/Ethernet switching unit (SWU) for BSC and contains 24 Gigabit Ethernet ports

In front panel there are:

2 x Optical SFP GigE, SX – short haul

2 x Electrical SFP GigE, RJ45 CAT5

1 MGT ports (RJ45) serial port for switch management

1 SER1 ports (RJ45) console connector used for initial configuration

In back panel there are:

20 Full-duplex 10/100/1000Base T/TX ethernet Ports

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Flexi BSC LAN topology

CPU LAN

PCU LAN

CPRJ45 panel

SW

U 0

SW

U 1

SW

U 2

SW

U 3

SW

U 4

SW

U 5

ETP LAN

SW

U 6

SW

U 7

• SWU’s 0 and 1 connect the CPU’s from OMU, MCMU’s and BCSU’s.

• SWU’s 2, 3, 4 and 5 connect all of the PCU’s in the BSC.

• If ETP cards are used (in case Packet Abis or AoIP are implemented), each LANU should be expanded with an additional ESB PIU for ETP LAN. Those additional ESB PIU’s are SWU 6 and 7.

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Flexi BSC Hardware and Functionality Flexi EMB connection principle – Flexi BSC

• Switched LAN is used• LAN is 2N redundant• EMB LANs are

physically separate from the internal LAN • cabling & LAN-switches

used by the internal LAN have been excluded from the picture

• Each computer reads its EMB address from EMB address plug• EMB address has same

value as MB address

CPU’s with 4 LAN ports

- 2 used for redundant EMB

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BSC3i 1000/2000 Hardware and FunctionalityEMB Addressing

ADMODxx, Address Module connector

• ADMODxx is going to be connected into rear of CP816-A PIU to make Ethernet MB address.

• There are total of 32 different ADMOD address module connectors available: ADMOD00 … ADMOD31.

• ADMODxx has 2x5 size 2mm Z-pack HM cable connector.

1

A

A

EMB interconnects the functional units of BSC. The EMB consists of a redundant L2 LAN Switch and LAN cables from computer units.

For commands to create EMB LAN, please refer to RG20 Documentation:

\Commission\ BSC/TCSM\ Commissioning Flexi BSC\ Checking the EMB in Flexi BSC

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Exercise: BSC interrogation (1/2)

MGW/TCSM

BTS

SGSN

ET ………

……….

………………

ET ………

ET ………

ET ………

ET ………

ET ………

ET ………

ET ………

….

Exercise: BSC Interrogation, duration ~ 30min

Required equipment: one working VDU terminal for each workgroup.

Complete the picture above according to your classroom BSC!

Write down the used MML commands!

How many BCSUs are available?

______________________________________________________________________

How many SWUs are configured and what kind of ESB card is in use? Interrogate the Plug-in Unit info.

______________________________________________________________________

______________________________________________________________________

How many ETs are in use?

______________________________________________________________________

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Exercise: BSC interrogation (2/2)

MGW/TCSM

BTS

SGSN

ET ………

……….

………………

ET ………

ET ………

ET ………

ET ………

ET ………

ET ………

ET ………

….

With the ZWUP-Command you can check whether an ET is used for A-IF, Abis-IF or Gb-IF. How?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Interrogate the plug-in units of the OMU (ZWTI)!

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Documents

03_RN28193EN20GLA0_Flexi BSC Architecture and Interface