gsm bss g10 bsc operation and configuration_part 1

8/10/2019 GSM BSS G10 BSC Operation and Configuration_Part 1

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GSM BSS G10 BSC Operation andConfiguration

Dmytro Chystyakov

August 2013


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BSC, TRC, BSC/TRC

TRC

The Transcoder Controller (TRC) node contains the pooled transcoder resources and isa stand-alone node. The TRC node requires its own AXE hardware platformcomponents such as APZ, IO and APT, as well as the transcoder hardware. The TRC isconnected to the MGW via the A-interface and to the BSC via the Ater-Interface. TheTRC node has the ability to support up to 16 BSCs over the Ater interface.

BSC

The stand-alone BSC is developed and optimized especially for rural and suburban

areas and is a complement to the BSC/TRC node in the BSC product portfolio. TheBSC contains the SRS and the TRH. It requires its own AXE 810 hardware platformcomponents, such as APZ, IOG or APG, APT. The BSC does not contain anytranscoders. It utilizes transcoder resources from a central BSC/TRC or from a TRCnode. The BSC is connected to the BSC/TRC or TRC via the Ater interface. It can beremote controlled from the OSS.

BSC/TRC

The BSC/TRC is a combined BSC and TRC node. The transcoders are set up on a percall basis, which implies a more efficient use of the transcoder resources. TheBSC/TRC is capable of handling 4095 TRXs.


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APZ Control System

Central Processor, CP

The CP has the most processing capacity in the AXE. It is responsible for all high-levelfunctionalities, like the analysis of telephone numbers and processing of charginginformation. The call setup procedure is one of the main tasks controlled by the CP.

Regional Processor, RP

The RP is responsible of controlling all hardware located in the APT switching part of AXE.The RP also off-load the CP with simple routine tasks and administrative operations.

I/O System

The main task of the I/O system is to connect the user to the AXE in form of AlphanumericTerminals, Alarm panels and External Media. The examples are: IOG 20, APG 40 andAPG43.


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APT Switching System

Group Switch, GS

The GS is the heart of the AXE. It is responsible for switching of calls, connection of APTequipment and synchronization both internally and externally. The GS is implemented inthe XDB boards.

Exchange Terminal, ET

The ET connects traffic links to the AXE. There are a lot of different standards for theselinks where STM-1 (155 Mbit/s) and E1 (2 Mbit/s) are the most common.

Signaling Terminal, ST

The signalling terminal is used to communicate with other nodes over signalling links.

Subscriber Equipment

The subscriber equipment is used to connect subscribers to the AXE. It can for example bea radio base station (RBS) in GSM, an ENGINE Access Ramp (EAR) for local fixed

subscribers or a PABX for Enterprise subscribers. This is not considered to be a part of theAXE.


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APZ

APZ 212 30 - High Capacity Version

The high capacity processor is housed in a double depth cabinet. It supports serial RP-bus,parallel RP-bus, or both. The memory in the processor is scalable to a maximum of 4 GWDS. The BSC uses DRAM memory. PS and RS are not scalable.

APZ 212 33

The APZ 212 33 supports serial RP-bus, parallel RP-bus, or both. The RP's can be spreadover max 32 RPB branches, each handling max 32 RP's. The DS is scalable(dimensionable) in steps of 512 MW using DRAM based boards. PS and RS are not

scalable.

APZ 212 33C - Compact Version

APZ 212 33C is the single magazine version of the APZ 212 33, called Compact Version.The CP of APZ 212 33C has about 56% less real time capacity compared to the APZ 21233 CP.

It supports serial RP-bus, parallel RP-bus, or both. Support for IPN, up to 960 RP on serial

RPB, 96 MW PS, 4 GW DS (DRAM memory only), size reduced to one magazine, powerconsumption reduced to about 200w.


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APZ

APZ 212 55

APZ 212 55 is based on Generic Ericsson Processor board (GEP) and consists of twodifferent components: two CP boards (CPUB) running the A and B side and oneMaintenance Unit Board (MAUB). APZ 212 55 is placed in the same eGEM magazine asAPG 43. The computational capacity of APZ 212 55 is at least the same as APZ 212 33c.The processor is equipped with either 4 GB or 8 GB memory. For a node equipped with 4GB memory, 128 MW16 is reserved for PS and 862 MW16 for DS. For a node equippedwith 8 GB memory is 128 MW16 for PS and 2902 MW for DS.

Only Ethernet based RP bus (RPB-E) is supported to communicate with the RPs in new deliveries.

APZ 212 60C

The APZ 212 60C is an evolution of the APZ 212 55 architecture.

APZ 212 60C is based on Generic Ericsson Processor board (GEP) and consists of twodifferent components: two CP boards (CPUB) running the A and B side and oneMaintenance Unit Board (MAUB). APZ 212 60C is placed in the same eGEM magazine asAPG 43/2. The computational capacity of APZ 212 60C is higher than APZ 212 55.

The processor is equipped with 8 GB memory, 128 MW16 is reserved for PS and 2.2 GWfor DS.


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APG (I/O System)

APG40

The APG40 is a high capacity IO system for AXE exchanges. It is based on a standardWindows 2003 Server platform. APG40 supports protocols for external interfaces such asTCP/IP, Telnet (remote login), FTP (file transfer) and RPC for message transfer.

The APG40 is housed in a full width BYB 501 magazine. The basic HW configuration is a10-slot node comprising the two APG40 nodes (one active, one standby), 54 GB ofmirrored Hard Disk and a DAT unit.

APG43

APG43 is based on Generic Ericsson Processor (GEP) HW and consists of four differentcomponents: two APUB running the redundant AP, two disc cards one external media andone alarm panel.

APG43/2

APG43/2 is based on Generic Ericsson Processor (GEP) HW and consists of four differentcomponents: two APUB2 running the redundant AP, two disc cards one external media

and one alarm panel.

APG43 (43/2) is placed in the same eGEM magazine as APZ 212 55 or APZ 212 60. APG43 (43/2)is a based on Windows 2003 server as APG40.


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APZ 212 33C and APG40C/2 (C/4)


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APZ 212 55 and APG43


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Interfaces

Serial RP Bus - RPB-S

The communication between the CP and RPs are transported over a dedicated serialinterface. There are cables from the RPH in the CP to two RPs in each magazine. Throughthese RPs the bus is also available in the backplane of most magazines.

IPN

The IPN is a 100Mbit/s interface between CP and AP which is based on Ethernet. It isrealized as an optional board in the RPH magazine and can be used by APZ 212 30.

IP/Ethernet LANThe optional BSC LAN switch provides traffic separation and routing environment for BSCapplications shielding the internal Ethernet communication from the external IPcommunication. The magazines that house RPs running the GPH application or the PGWapplication are connected individually or in cascade to the LAN switches. The connection isdone with external cabling from the magazine Ethernet switch or a GESB placed in themagazine to the LAN switch. Other applications or modules that are connected to the LANswitch are APG, STOC and SIGTRAN.


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Interfaces

Maintenance Bus

The maintenance bus is housed in the backplane of all BYB 501 magazines. It is managedby RPs adapted to the serial RP bus.

The functionality provides possibility for the system to get information of board identity,version of HW and also to indicate status of the board by controlling the MIA LED (ManualIntervention Allowed Light Emitting Diode) placed at the front of the boards.

Ethernet Backplane Communication

A duplicated Ethernet bus in the backplane is used in the magazines for communicationbetween the RP and the Ethernet magazine switches. In the GDDM-H type of magazinethe Ethernet switch is called EPS/EPSB in the GEM type of magazine the Ethernet switch isintegrated with the SCB-RP. The communication between different magazines is eitherdone with cables directly connecting the magazine switches or through GESB with externalcabling.


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Interfaces

DL34 Interface

The DL34 interface is a backplane interface, optimized for communication between theGS890 and the various high-speed devices. Capacity is variable between 128 and 2688time slots, in step of 128 time slot. Variable capacity of DL34 makes it possible to getmaximal utilization of the GS890. It is achieved by mixing of high, low and mediumcapacity devices in the GEM, without wasting of the Group Switch capacity. Physical bitrate is 222.22 Mbit/s.

DL3 Interface

This is the internal GSS interface which is used to interface the group switch (TSMs) witheither subrate switch or DLHBs in GDM/GDDM type magazines. The interface is aredundant high speed interface and serves 512 MUPs (logically 16 DL2 interfaces).

DL2B Interface

DL2B interface is the DL2 interface housed in the backplane of GDM/GDDM typemagazines.


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Interfaces


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AXE 810 Group Switch - GS890

The GS890/CL890 switch has a distributed architecture with the switch boards residing together

with clock and device boards in a Generic Ericsson Magazine (GEM). The switch capacity is 16kMUPs per switch board and GEM.

The GS890 switch can be used for subrate, together with normal rate, with a maximum capacityof 128 kMUPs. Extensions can be made in steps of 16K in this mode.

The GS890 switch is plane duplicated with both planes contained in the same magazine. A GEM isalways equipped with two board types: 2 XDB (one for each plane) and 2 SCB-RP (one for each

plane). The CLMs are also duplicated, each CGB comprising two oscillators. If more than one GEM

is used, the CGBs are placed in different GEMs.

The interface between the Group Switch and devices in the GEM is provided by the DL-34, whichoffers variable capacity from 128 MUPs up to a maximum of 2688 MUPs, in steps of 128 MUPs.Devices residing in GDM magazines that do not support the DL-34 interface may be connected

using a duplicate DLEB board. Each pair of DLEB boards has sufficient capacity for connection ofup to four GDM magazines, i.e., four DL-3 interfaces.


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GEM, eGEM, eGEM2GEM

GEM in its basic configuration contains two duplicated 16 kMUPs Group switch units permagazine plus a pair of regional maintenance processors. The GEM provides physical

space for up to 22 different devices such as: TRA, ET155, SCB-RP, XDB, DLEB, CGB, IRB,LRB and CDB. The RP Bus and a 100 Mbit/s Ethernet are connected to each physical slotof the GEM magazine.

eGEM - Evolved GEM

eGEM Evolved Generic Ericsson Magazine is based on the present GEM with addition of10G Ethernet interfaces, Intelligent Platform Management Interface (IPMI) and Telecom

Synchronization signal distribution.

It is possible to use units designed for GEM in eGEM but there are some limitations. Someboards designed for GEM are not fully eGEM compliant these limitations are welldocumented.

eGEM2 - Evolved GEM 2

eGEM2 Evolved Generic Ericsson Magazine 2 is based on the present eGEM.

eGEM is always equipped with two Switching Distribution Boards (XDBs), one for eachswitching plane, and two SCXB (Main Switch Board). There are also two slots reserved forfuture. In addition to these 22 device boards can be housed.


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GEM, eGEM, eGEM2GEM 0-2

SCB-RP

XDB

XDB

SCB-RP

X

M-4

X

M-5

bus 11352

354

356

358

360

362

364

366

368

370

372

374

376

357

359

361

363

365

367

369

371

373

375

377

355

353

xm-0-2- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

SLOTNO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

GEM 0-1

SCB-RP

XDB

IRB

CL890CGB

CDB

CDB

XDB

SCB-RP

XM-2

CLM-1

XM-3

bus 6192

194

196

198

200

202

204

206

208

210

214

197

199

201

203

205

207

209

211

213

195

193

xm-0-1- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

SLOTNO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

GEM 0-0

SCB-RP

XDB

IRB

CL890CGB

CDB

CDB

XDB

SCB-RP

XM-0

CLM-0

XM-1

bus 5160

162

164

166

168

170

172

174

176

178

182

165

167

169

171

173

175

177

179

181

163

161

xm-0-0- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

SLOTNO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25


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SCB-RP, SCXB, XDBMaintenance Processor Board - SCB-RP

The SCB-RP controls the GEM magazine. This board takes in, filters and supervises the -48V. It also supervises the Maintenance Bus and distributes the control bus from CP.

Maintenance Processor Board - SCB-RP/3

SCB-RP/3 provides the same functionaliy as SCB-RP and in addition it also acts as an GEMmagazine Ethernet switch and provide accessibility to up to 26 boards via 10/100BaseTand provide external Ethernet switch accessibility one 1000BaseT and two 10/100BaseT.

Maintenance Processor Board - SCB-RP/4

SCB-RP/4 controls the eGEM magazine, but can also be used in an GEM magazine. Itprovides the same functionaliy as SCB-RP and in addition it also acts as an GEM/eGEMmagazine Ethernet switch and provide accessibility to up to 26 boards via 10/100/1000BaseT and provide external Ethernet switch accessibility six 10/100/1000BaseT.

Maintenance Processor Board - SCXB

SCXB controls the eGEM2 magazine. It provides the same functionaliy as SCB-RP and inaddition it also acts as an eGEM2 magazine Ethernet switch and provide accessibility to up

to 30 boards via 10/100/1000BaseT with autonegotiation and provide external Ethernetswitch accessibility four 10/100/1000/10000BaseT and two 10/100/1000BaseT ports inthe front.


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CGB, CDB, IRB, GARP-2, XDBClock Generation Board - CGB

CGB generates Clock and Synchronization signal to the switch.

Two CGBs are housed in the same GEM, in case of one GEM configuration (16 kMUPs). Ifthe switch size is bigger than 16 kMUPs the CGBs are housed in different GEMs in order toimprove the reliability of the system.

Clock Distribution Board - CDB

The CDB distributes clock and synchronization to the switch. It is necessary if the switch isbigger than 16 kMUPs.

Incoming Reference Board - IRB

The IRB receives three external synchronization references that are terminated, convertedand distributed to the CGBs.

GARP-2

The Generic Application Resource Processor ver. 2 (GARP-2) is connected to the DL34interface in the backplane. GARP-2 has two Gigabit Ethernet interfaces in the backplaneand two on the front. Following applications are using GARP-2: GPH, TRH, PGW, AGW

Distributed Switch Board - XDB

XDB is 16 kMUPs switch board with switching and DLMUX functions.


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GESB, PGWB, STEB, BSC NIEGESB Gigabit Ethernet Switch Board

GESB is a Gigabit Ethernet switch, able to handle inter communication between GEMmagazines as well as communication to GEM-external stations. GESB provides eight

1000Base-TX ports towards the front.

PGWB Packet Gateway Board

PGWB is an Inter-Working Unit between the IP Ethernet interfaces and the GSS. Two100Base-TX Ethernet ports are provided to the backplane. The DL34 interface is providedto the backplane. DL34 is the interface between PGWB and XDB.

STEB

The STEB implements signalling terminal (ST) functionalities of No. 7 signalling using Nband HSL protocol in AXE 810 system. The protocol layers implemented on STEB are MTP1and MTP2 for Nb and HSL Q.703 Annex A or SAAL for HSL (ATM based). STEB supports upto: 4 HSL links or 128 Nb signalling links.

BSC Network Interface Ethernet

The BSC NWI-E 450A is a single-slot width board L2/L3 switch for the BSC. The NWI-E

450A are housed in a GEM or eGEM magazine. Two NWI-E 450A boards are used toprovide redundancy.

The NWI-E 450A provides a VLAN environment for BSC modules that uses IP overEthernet communication.


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TRATRA R6 (CSPB 1.0)

TRA R6 is a CSPB 1.0 based application. It supports all codecs used in GSM system, i.e.EFR, FR, HR and Adaptive MultiRate codec (AMR) HR & FR. It also supports TFO for EFR,

AMR-FR and AMR-HR. The TRA R6 is built in a DSP ASIC technology developed especiallyfor speech processing. This results in the ability to handle 192 speech channels per board,small size and low power consumption. When TFO is used the channel density is reducedto 128 channels per board for narrowband codecs. It is connected to the Group Switch viaa DL34 interface and is controlled by the APZ via an on-board regional processor (RPI).

TRA R7 (CSPB 2.0)

TRA R7 is a CSPB 2.0 based application. It supports all codecs used in GSM system, i.e.

EFR, FR, HR and Adaptive MultiRate codec (AMR) HR & FR & WB. It also supports TFO forEFR, AMR-FR, AMR-HR and AMR-WB. The TRA R7 is built in a DSP ASIC technologydeveloped especially for speech processing. This results in the ability to handle 384speech channels per board, small size and low power consumption. Compare to TRA R6,the channel density is not reduced when running TFO for narrowband codecs. It isconnected to the Group Switch via a DL34 interface and is controlled by the APZ via anon-board regional processor (RPI).


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ET155-1, DLEBET155-1 STM-1

ET155-1 STM-1 is a 155 Mbit/s STM-1 Exchange Terminal that can terminate up to sixtythree 2 Mbit/s PDH tributaries. It supports ETSI standards. The ET155-1 STM-1 is a single

board implementation (two boards if protection is required) that is mounted in the GEMmagazine. A maximum of 8 fully utilized ET155-1 and 8 standby (protection) ET155-1 canfit into a GEM magazine when using fully equipped STM-1 frames. For non-fully utilizedSTM-1 frames, a maximum of 22 ET-155-1 can be placed into the GEM magazine. In anycase, the limitation is 16k ports and 22 board positions. The ET155-1 is connected to theGroup Switch via a DL34 interface and is controlled by the APZ via an on-board regionalprocessor (RPI).

Digital Link MUX for Existing Equipment Board - DLEB

DLEB is a DLMUX that demultiplexes DL34 to DL3. One DLEB can handle four DL3 cablesfrom GDM magazines and one DL3 cable from ET155-7 for LOT protection. (The DL3 cablefor LOT protection is not used under normal conditions. It is connected to the same TS4Bused by the other four DL3. If a fault occurs this DL3 is electrical inserted by a three-stateconnector. No manual intervention is needed.) There is one DLEB for each plane. The twoDLEBs for plane A and B are placed in the slots 11 positions apart.


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GDM, GDDMDuplicated DLHB boards and an RP-pair are housed in each magazine. DLHB converts one DL3interface to 16 DL2B interfaces, where the DL2B interface is a DL2 interface adapted for thebackplane. DL3 is the interface used between TSM and GDM/GDDM type magazines.

The GDDM magazine also includes a duplicated Ethernet bus in the backplane.


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GDM-H, GDDM-HGDM-H (Generic Device Magazine for Half Sized Boards)

One duplicated DL3 interface (one for each plane) is handled. One RP pair and duplicatedDLHB are housed in the magazine.

The devices adapted to this type of magazine are ETC5, ETC-T1H, RPG2 and RPG3.

GDDM-H (Generic Device Datacom Magazine for Half Sized Boards)

One duplicated DL3 interface (one for each plane) is handled. One RP pair and duplicatedDLHB are housed in the magazine. The magazine is also equipped with duplicatedEthernet Packet Switch Board (EPS or EPSB).

The device adapted to this type of magazine is RPP.

Also note that any devices adapted to GDM-H can be fitted in this magazine.


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RPG2/RPG3RPG2

RPG2 is an RPG adapted for BYB501 practice, i.e. GDM-H, DL2B and serial RP-bus. Thehalf size board requires 40 mm spacing, which means that every second device slot is

used. Each board handles one DL2. The RPG2 is used as a platform for TRH, No. 7 andSTC.

RPG3

Regional Processor with Group switch Interface (RPG3) is a one board, plug in unit,adapted for BYB501 practice and located in GDM-H magazine. It supports regionalprocessing and communication between the Central Processor (CP) in AXE and the remotedevices through the Switching Network Terminal/Digital Link, variant 2 (SNT/DL2)interface.

The RPG3 is the successor to the RPG2, which means that only the Serial RegionalProcessor Bus (RPB-S) is supported. All interfaces toward the application in RPG2 are stillintact in RPG3. The RPG3 provides an Ethernet interface, that can be used for connectionto external equipment. There are also maintenance bus and test interfaces.

The RPG3 has significantly higher performance than RPG2, which means it has higherprocessing capacity and higher memory capacity. It also contains 8 MByte of flash PROM.

The RPG3 is used as a platform for TRH, No. 7, STC and STOC applications.


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RPP

RPP

The RPP is based on Power PC hardware platform. The RPP is a half size board with doublewidth, it is of the same size as an RPG2 board. A fully equipped GDDM magazine canhouse up to 7 RPPs. A fully equipped GDDM-H also include two Ethernet Packet SwitchBoards (EPS or EPSB). The duplicated switch boards allow the RPPs to use the Ethernetbus

The RPPs are used to run the GPRS Packet Handler (GPH), High Speed Signalling Link(HSL).

The RPP boards used for GPRS Packet Handler (GPH) implements the RP part of the PCUfunctionality which gives the BSC GPRS functionality. The GPH application is distributedover several RPPs and use Ethernet for RP-RP communication and functional distribution.The Gb and GSL interfaces are terminated in the RPPs.

The RPP boards used for the High-speed Signalling Link (HSL) can administrate one highspeed signalling link each. It is recommended to have at least two HSLs in the BSCworking side by side for redundancy reasons. Each HSL occupies a full 2 Mbit/s link. Themaximum number of HSL which can be used is 16.


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Flow of CS Traffic/Signalling and PSTraffic/Signalling in the BSC/TRC.


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RBS


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RBS2000/RBS6000

DXU

Distribution Switch Unit

ACCU/DCCU

AC/DC Connection Unit

PSU

Power Supply Unit

CDU

Combining and Distribution Unit

IDM

Internal Distribution Module

DUG

Digital Unit GSM

RUS (MCPA)

Radio Unit all Standards (Multi CarrierPower Amplifier)


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RBS


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RBSMANAGED OBJECTS (MO)

An MO is a logical representation of hardware units and software in the BTS. However,hardware units may actually be shared between MOs of different classes. These classes include:

Transceiver Group (TG)

Central Function (CF)

The CF is the control part of a TG. It is a software function, handling common controlfunctions within a TG. There is one CF defined per TG.

Concentrator (CON)

The CON (also known as the LAPD Concentrator) is used by the optional feature LAPDConcentration for RBS 2000. Therefore, the CON, as an MO, is itself optional. There is oneCON defined per TG.

Transceiver Controller (TRX)

The TRXC controls all the functions for signal processing, radio reception, and radiotransmission. In a normal configuration, each TRXC (also known as TRX) corresponds toone TRU. There can be up to 16 TRXCs defined per TG.

S


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RBS Transmitter (TX) and Receiver (RX)

The MO representing the transmitter functions for example, transmitted power andfrequency on the bursts sent is called the TX. The RX represents the radio receiving

functions. There can be up to 16 TXs and RXs defined per TRXC.

Interface Switch (IS)

The IS provides a system interface to the PCM links and crossconnects individual timeslotsto specific transceivers. There is one IS defined per TG

Timing Function (TF)

The TF extracts synchronization information from the PCM links and generates a timingreference for the RBS. There is one TF defined per TG.

Time Slots (TS).

TS is the MO that represents the handling of timeslots. There can be up to eight TSsdefined per TRXC.

Multi Carrier Transmitter Receiver (MCTR).

MCTR represents the TRX functionality in the MCPA (RUS) HW.

CELL


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CELL

CELL DEFINITION

DESCRIPTION DATADEFINITION OF SUBCELLS

CHANNEL GROUPS

FREQUENCY HOPPING DATA

CONFIGURATION FREQUENCY DATA

CONFIGURATION CONTROL CHANNEL DATA

MEASUREMENT FREQUENCIES

NEIGHBOR RELATIONS

CONNECTION OF CELL TO TRANSCEIVER GROUP

CELL STATE


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Wi FIOL


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WinFIOL

OSS/CNA


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OSS/CNA

OSS/CNA


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OSS/CNA

OSS/BSM


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OSS/BSM


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gsm bss g10 bsc operation and configuration_part 1

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