BTS(BaseTransceiverStation)

ItConsistsof4mainandbasicmodulesnamely:

1)Digitalmodules2)RFModules3)PowerSupplyandCircuitbreaker modules.

4)ThermalControlsystemmodule.

DIGITALMODULES:

Providethemicrobasecontrolunit(microBCU)functionalityfortheBTSsite.

LOCATION:bottomrightsideofthecage electronically interconnected through thebackplane.

DigitalmoduleandBPSMlocations

MicroBaseControlUnit(BCU):

Thiscontainsmasterandoptionalredundantdigitalmodules: FiberOpticMultiplexer(FMUX). MainControlUnitwithdualFMUX(MCUF). NetworkInterfaceUnits(NIUs),fourintotal. Analarmboard(noredundancyoption). Oneortwo(forredundancy)BCUPowerSupplyModules(BPSMs).

FUNCTIONOFmicroBCU:

TheBCUcan: SupportstwoMCUFs(1+1)ataBTSsite

EnableMasterMCUFfailuretoresultinslaveMCUFbecomingmasterafterreset.

EnableOMCoperatortoinitiatemaster/slaveMCUFswap.

ConfigureCTUsbythemasterMCUF.

Modules:

DigitalmoduleandCTUconnections

The MCUF is connected to the CTUs in the samecabinetthroughthebackplane.

FMUXs, two internal to theMCUFandonehalfsizemodule, convert the electronic data stream into afiberopticsignal.

AnFMUXmoduleineachextensioncabinetconvertsthe fibreopticsignalback toelectronicdatastream,fortransmissiontoCTUsviathebackplane.

TheNIUmodulesconvertsignalsforterrestrialE1orT1lines

MainControlUnitwithduelFMUX(MCUF):

TheMCUFprovidesthefollowingfunctions:

Callprocessing.

Switchingoftrafficandcontrolinformation.

Timingreferenceandnetwork/BTSmasterclocksynchronization.

ThefunctionalityoftwoFMUX

SupportofuptosixE1orT1circuits,viaNIUmodules.

SupportoftheCSFPfunctionviathePCMCIAflashmemorycard.

ViewoftheMainControlUnitwithdualFMUX(MCUF)module

FRONTPANELPORTS: TTYinterface:

A standard TTY interface is provided, of 9.6 kbit/s. A localmaintenance terminalcanbeattachedtothisporttousetheManMachineInterface(MMI)oftheMCUF.

DebugandBDMports: TwofrontpanelportsareforMotorolafactoryanddevelopmentuseonly

FMUXfiberopticconnections: TherearefiberopticconnectionsfromtheMCUFinternalFMUXmodules.Thefiber

optic connectors enable connection to FMUX modules in other cabinets foradditionaltransceivers.

CALport: usedtocalibratethesyncblockclockviaMMIcommands.

PCMCIAInterface: Code Storage Facility Processor (CSFP) memory. Rapid site initialization. The

PCMCIAsocketisanindustrialstandard68pinsinglesocket,fittedwithanejector.

OtherComponents: DRAM

16Mbytesize providesoperationalcodeanddatastorageforthemainprocessors. aSIMMsocket inthecircuitboard,enablingtheadditionofafurther16

Mbytesifrequired.

FastflashEPROM 1Mbyte(256kx32)size Usedforbootcodeandexecutiveprocesscode.Ithasafastaccesstime

(

CODELOADING:

CSFPcodeloading

IfaPCMCIAmemorycardisavailable,thenacodestoragefacilityprocessor(CSFP)functioncanbesupported.

Anewsoftwareloadcanbedownloadedinbackground,withoutanyreductioninservice.

InPCMCIAcard,codeswapcanbeinitiated.Thesite isresetandthenewsoftwarebroughtintoservice(

SYNCBlock: Controlledviatheparallelinterfaceofthemainprocessors.

Responsibleforsitesynchronizationfunctions.

Generatesall required local referencesfromahighstability localclocksource.

Siteframereferencegenerationandretimingincludes: 2.048MHzForserialcommunications. 16.384MHzForFMUXcommunications. 125sForNIUframingandtransceiverframing. 60msFortransceiverGSMtiming. 6.12sForGSMsuperframe.

FiberOpticMultiplexer(FMUX)moduleandFMUXfunction

Required tomultiplexsix fullduplex transceiver linksontoasinglefiber link, and demultiplex a single fiber link to six full duplextransceiverlinks.

Hastwomodesofoperation: Working inconjunctionwith theMCUFtomultiplex transceiver

linksto/fromanextensioncabinet. Operatingintheextensioncabinettosupplythetransceiversin

thatcabinet.

EachFMUXfiberoptic link is fullduplex16.384Mbit/s.TheFMUXopticallinkiscapableofdrivingupto1km.

FMUX:

FMUXFunctionality:

BTS(Base Transceiver Station)DIGITAL MODULES: Digital module and BPSM locationsMicro Base Control Unit(BCU): FUNCTION OF micro BCU:Modules:Digital module and CTU connections Main Control Unit with duel FMUX (MCUF):-View of the Main Control Unit with dual FMUX (MCUF) moduleFRONT PANEL PORTS:Slide 13Other Components:CODE LOADING:CSFP code loading SYNC Block:Fiber Optic Multiplexer (FMUX) module and FMUX functionFMUX:FMUX Functionality: