Huawei BSC HW Card Introduction

BSC6900 Board Layout

GOMU: As it Operation and maintenance unit for BSC it serves as server for BSC.

It has high computation speed and Outstanding data processing capability.It is a Bridge b/w LMT client / M2000 and BSC Boards.Eth 2 is used to connect through LMT PC.Eth 0 is used to connect to M2000 PC.Works on Two Modes:Single server Mode of BSC: it has only One GOMUDual server Mode of BSC : it has Two GOMU (Active/Standby)Command to set single mode configurationSET OMUSTARTMODE: MODFLG=Single; Run LED glows for 1 sec then off for 1sec shows proper running of board.

GOMU Hardware details

(1) Screw(2) Leaf spring(3) Wrench(4) RUN LED(5) ALM LED(6) ACT LED(7) Reset button(8) Shutdown button(9) USB port (10) ETH0 (Ethernet port)(11) ETH1 (Ethernet port)(12) ETH2 (Ethernet port)(13) COM port(14) VGA port(15) HD LED(16) OFFLINE LED(17) Hard disk(18) Screw for fix the hard disk

GSCU: It handles the sub rack like managing, switching and clock information.

Ethernet Port has two LED;1st LED if continues yellow or fast blink shows the proper connection.2nd LED if blinks red show the data flow. By resetting the GSCU of GMPS we can Reload the all Board software.

GSCU (Active)Board BoardGE of RearIntercross CableGSCU (Standby)GSCU (Active) BoardBoardGSCU (Standby)GE Switching SubsystemStar interconnection between subracks, four cable realize Active/Standby model Intra-subrack active/standby GSCU boards: HiG interconnection; 30G bandwidth. Intra-subrack GE switching: The GSCU board provides 48G GE switching capability through backplane.Inter-subrack GE switching: The GSCU boards are connected in star topology through intercross cable using the GE ports on GSCU.

GSCUGSCUGGCU (Active/Standby)0# subrackBoardBoardBoardGMPSGEPSTime synchronization primary referenceTransmission synchronization reference sourceBackplaneCable transmitBackplaneBackplaneGEPSBoardGSCUBoardBackplaneBoardClock Solution

GTNU: It is the Switching Centre for CS services of entire system.

Speed is 128 X 128 K TDM switching.Allocating TDM network resources, establishing, and releasing radio linksWorks in Active Stand by Mode.

GDPUC: Its Data processing Unit for CS services.

Encoding and Decoding of voice services.Data services rate adaptation.Voice enhancement functions.Detect Voice Faults automatically

GTNU (Active)BoardBoardLVDS TDM path of backplaneInter-GTNU CableGTNU (Standby)GTNU (Active)BoardBoardGTNU (Standby)TDM Switching SubsystemIntra-Subrack: Other boards in the subrack connect with GTNU (Active/Standby) through LVDS (Low Voltage Differential Signal) high speed serial ports of backplane.Inter-Subrack: TDM units of every subrack fully interconnected with each other through GTNU crossover cables.In full intra-subrack interconnection, 2 cables support 8K bandwidth.

GGCU: Generates and retains the syck Clock signals.FG2c: The FG2c board is optional. It can be installed in the MPS and in the EPS. The number of FG2c boards to be installed depends on site requirements.Provides twelve channels over FE ports or eight channels over FE ports and four channels over GE portsProvides the link aggregation function at the MAC layerProvides the routing-based backup and load sharingSupports the transmission of data over all its Ethernet ports on the basis of the synchronized clock signalsSupports the Abis, A, and Gb interfacesGGCUPARCRUNALMACT89COM0COM101234567CLKOUTTESTINTESTOUTCLKLIN1CLKLIN0

The connection of the GGCU of the main subrack and the GSCU of the extension subrack is shown as following figure: The active GGCU and the standby GGCU output 10-way signal channel respectively. A signal channel of an active GGCU and that of a standby GGCU are integrated through the Y-shaped cable. GGCU support six service subracks, one is the GMPS, others five are the GEPSs where the 10 cables from GSCUs to GGCU can be connected at most. Any of component including GGCU, Y-shaped cable, and GSCU is faulty, the system clock still can work normally. GMPSGGCUGGCUGEPSGSCUGSCUGEPSGSCUGSCUY CableClock Synchronization Interconnection

XPUb:

Managing the user plane resources; managing the load sharing of the user plane resources between subracks Maintaining the load of the control plane within the subrack; exchanging the load information on the control planes between subracks Forwarding the RRC connection request message to implement the sharing of user plane resources and sharing of control plane resources in the BSC6900Processing upper-layer signaling over the A, Um, Abis, and Ater interfaces Processing transport layer signaling Allocating and managing the various resources that are necessary for service setup, and establishing signaling and service connections Processing RFN signaling

BM/TC Separated BM/TC CombinedGMPS/GEPSLogical DPU board must be GDPUX where physical board is DPUcNo Ater interface boardsWhen BSC and MSC are located in the same equipment room, combined BM/TC is recommended, i.e., GTCS is not needed, so the configuration is more flexible.When BSC and MSC are in different equipment rooms, separated BM/TC with remote TC will be used.GMPS/GEPSAter Interface boards are needed.GTCSDPUa and DPUc can be used together, configured as GDPUC and GDPUXAter interface boardsMore Flexible Configuration: Separated and Combined BM/TC

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