OCB-283

RTTC, HYD

INTRODUCTIONDEVELOPED BY CIT ALCATEL OF FRANCE .HAS GOT SIMILARITIES WITH ITS PREDECESSOR E-10B ALSO KNOWN AS OCB-181 IN FRANCE.FIRST OCB-283 EXCHANGES OF R11 VERSION WERE COMMISSIONED IN BREST (FRANCE) AND BEIJING (CHINA) IN 1991.FIRST OCB283 EXCHANGE CAME TO INDIA IN 1993.UPGRADED AND VERSION R-20 WAS VALIDATED IN JAN 1994.THE EXCHANGES SUPPLIED TO INDIA BELONG TO R-21 VERSION. R-22 &R-23 FAILED.PRESENTLY R-24 IS WORKING.

SALIENT FEATURESIT IS A DSS WITH SINGLE TSTAGE SWITCH.A MAX OF 2048 PCMs CAN BE CONNECTED.SUPPORTS MFR2,CAS AND CC#7 SIGNALLING SYSTEMS.PROVIDES BASIC TELEPHONY,ISDN,DATA COMMUNICATION, CELLULAR AND OTHER VALUW ADDED SERVICES.SYSTEM HAS AUTOMATIC RECOVERY FEATURE.WHEN A SERIOUS FAULT OCCURS IN A CONTROL UNIT ,IT GIVES A MESSAGE TO SMM (O&M UNIT). THE SMM PUTS THIS UNIT OOS,LOADS THE S/W OF THIS UNIT IN A BACK-UP UNIT AND BRINGS IT INTO SERVICE.DIAGNOSTIC PROGRAMMES ARE RUN ON THE FAULTY UNIT AND REPORT IS PRINTED .

SALIENT FEATURES CONTD...HAS GOT DOUBLE REMOTING FACILITY.SUBSCRIBERS ACCESS UNIT CSND CAN BE PLACED AT A REMOTE PLACE AND CONNECTED TO THE MAIN EXCHANGE THROUGH PCM LINKS.FURTHER,LINE CONCENTRATORS CAN ALSO BE PLACED AT A REMOTE LOCATION AND CONNECTED TO THE CSNL OR CSND THROUGH PCMs.VARIOUS UNITS OF OCB-283 ARE CONNECTED OVER TOKEN RINGS FOR FAST EXCHANGE OF INFORMATION SO THAT COMPLICATED WIRING BETWEEN VARIOUS UNITS IS AVOIDED.TO AVOID LOSS OF REVENUE SUBS CHARGE ACCOUNTS ARE AUTOMATICALLY SAVED IN THE DISC ONCE IN A DAY. HANDLES 8,00,000BHCA AND 25,000 ERLANGS OF TRAFFIC.A MAX OF 2,00,000 SUBS OR 60,000 CIRCUITS CAN BE CONNECTED.

SALIENT FEATURES CONTD...X-GE CAN BE MANAGED LOCALLY OR FROM AN NMC THROUGH 64KBPS LINK.ALL CONTROL UNITS ARE IMPLEMENTED ON THE SAME TYPE OF H/W. THIS IS CALLED A STATION.DEPENDING ON THE REQUIREMENT OF PROCESSING CAPACITY S/W OF EITHER ONE OR SEVERAL CONTROL UNITS CAN BE LOCATED ON THE SAME STATION.FOR ALL THESE CONTROL UNITS ,ONLY ONE BACK-UP STATION IS PROVIDED ENABLING AUTOMATIC RECOVERY IN CASE OF FAULT.SYSTEM IS MADE OF ONLY 35 TYPES OF CARDS EXCLUDING CARDS USED IN CSN.BEING MODULAR EXPANSION IS EASILY CARRIED OUT BY ADDING NECESSARY H/W &S/W.

SALIENT FEATURES CONTD...THE SMMs ( O&M UNITS ) ARE DUPLICATED WITH ONE ACTIVE AND OTHER HOT STANDBY.IN CASE OF FAULTS ,SWITCH OVER TAKES PLACE IMMEDIATELY.MOREOVER,AS THE DISKS ARE CONNECTED TO BOTH SMMs,THERE IS NO NECESSITY OF CHANGING CABLES FROM ONE SYSTEM TO ANOTHER.THE HARD DISC IS VERY SMALL IN SIZE, COMPACT AND MAINTANENCE FREE.IT HAS A VERY HUGE CAPACITY OF 1.2 GIGA BYTES ( LATEST 4 TO 8 GIGA BYTES).THE DETAIL BILLING DATA IS REGULARLY SAVED IN THE DISC ITSELF,FROM WHERE THEY CAN BE TRANSFERRED TO MAGTAPE FOR PROCESSING.THE SPACE REQUIREMENT IS VERY SMALL.NO SEPARATE ROOM IS REQUIRED FOR OMC.THERE IS NO FIXED OR RIGID RACK AND SUITE CONFIGURATION IN THE SYSTEM.FALSE FLOOR AND CEILING ARE NOT ESSENTIAL.SYSTEM CAN WORK FROM 50 C TO 450 C,THOUGH THE OPTIMUM TEMPERATURE IS 220 C.

THE ALCATEL FAMILYALCATEL1000 E 10ALCATEL1100PACKETSWITCHINGALCAETEL1400INALCATEL900MOBILE TELEPHONYALCATEL1000BROADBANDATMALCATEL1300TMNALCATEL1100VANSVANSVALUE ADDED NETWORKSERVICESTMNTLECOMMUNICATIONSMANAGEMENTNETWORK

FUNCTIONAL ARCHITECTUREX-GE HAS GOT THREE BASIC SUBSYSTEMS:SUBSCRIBER ACCESS SUBSYSTEMCONNECTION & CONTROL SUBSYSTEMOPERATION & MAINTANENCE SUBSYSTEMSUBSCRIBER ACCESS SUBSYSTEM:TREATED AS AN INDEPENDENT ENTITYEVERY SUBSCRIBER CONNECTING EQUIPMENT RACK IS GIVEN A SIGNALLING POINT NUMBER TO OPERATE IN COMMON CHANNEL SIGNALLING MODE WITH REST OF THE EXCHANGE SUBSYSTEMS.

SUBSYSTEMS CONTD...CONTROL & CONNECTION SUBSYSTEM CONSISTS OF:CONTROL EQUIPMENT:PROCESSMONITORCONTROL THE CALL SETUP AND RELEASECONNECTION & SWITCHING EQUIPMENTS:SWITCHING MATRIX EQUIPMENT FOR PERFORMING DIGITAL TIME SWITCHING OF SPEECH PATHCONNECTION EQUIPMENTS FOR CONNECTING PCM ( DIGITAL) JUNCTIONS FROM OTHER EXCHANGES AND RSUSAUXILIARY EQUIPMENTS FOR TONES ,FREQUENCIES & OTHER AUXILIARIES FOR SIGNALLING PROTOCOL HANDLINGOPERATION AND MAINTANENCE SUBSYSTEM:FOR OPERATION AND MAINTANENCE OF EXCHANGE BY OPERATORS OR THROUGH REMOTE NMC.

CONNECTION UNITS

CONTROL UNITSTHESE UNITS PROVIDE CONTROL OF CALLS ON THE BASIS OF STORED PROGRAMMES.THEY PROCESS THE CALLS ON THE RECEPTION OF DIALLED DIGITS FROM CALLING SUB/CKT AND TAKE PART IN HANDLING OF CALL SET-UP AND RELEASE BY :PROCESSINGMONITORINGMEASURING CHARGING OF CALLS AND ALL OTHER CONTROL FUNCTIONS NEEDED FOR WORKING OF A X-GE.

CONTROL UNITS

S/N & O&M UNITSSWITCHING NETWORKPROVIDES FACILITY FOR CONNECTING THE LRs (INTERNAL PCMs) COMIMG FROM CONNECTION UNITS AND PERFORMS SWITCHING OPERATION FOR CALLING SUBS TS ONTO CALLED SUBS TS AND VICE VERSA FOR A TWO WAY CONNECTION PER CALL OF TELEPHONY.O&M UNITS AND MAINTANENCE PERIPHERALS:ALSO KNOWN AS OMC-OPERATION AND MAINTANENCE CENTRE.PROVIDES ACCESS FOR MAN-MACHINE DIALOGUES FOR THE HUMAN OPERATORS TO INTERACT AND COMMAND THE WORKING OF X-GE EQUIPMENT.

CSNLCSNDSMTURMSMX

MCX

COMBTETAPUPECOMMUNICATION MULTIPLEXOMMQGXMRTXTRPCCKTS SMADTLRLRLR(4MBPS)TMN

HARDWARE UNITSSMT: TRUNK MULTIPROCESSING STATIONSMA:AUXILIARY MULTIPROCESSING STATIONSMC:CONTROL MULTIPROCESSING STATIONSMX:SWITCH MULTIPROCESSING STATIONSTS:SYNCHRONISATION AND TIME BASED STATIONSMM:MAINTANENCE MULTIPROCESSING STATIONCSN:SUBSCRIBER DIGITAL SELECTION STATIONTOKEN RINGS:MIS: INTERSTATION MULTIPLEXERMAS:STATION ACCESS MULTIPLEXERMAL:ALARM MULTIPLEXERLP: LINKS FOR SPEECH

REMOTECONCENTRATORCSNLLRCSNDSMTPCM JUNCTIONSLRSWITCHINGMATRIXSINGLE TSMXMASLRSMACSNLLRCONTROL UNIT - SMCMISOPERATION AND MAINTANENCE UNIT SMM-A&BNMC