1. SIX WEEKS TRAINING IN BSNL(J&K,SRINAGAR)

2. Submitted by SANJAY ECE-A SEMINAR ON OCB-283

3. GENERAL ARC HITECTURE OF OCB-283 SUBSYSTEMS & FUNCTIONS OF OC B-283

4. Exchange has got 3 basic subsystems :- 1SUBSCRIBER ACCESS SUBSYSTEM 2CONNECTION & CONTROL SUBSYSTEM 3.OPERATION & MAINTENANCE SUBSYSTEM INTRODUCTION OF OCB-283

5. COMMUNICATION MULTIPLEX OM MQGXMRTXTRPC COM ETA PU PE SMT URM MCX CSNL CKTS LR ( 4MB / S) DT LR TMN 2 MB/S PCM CSND BT OCB-283 FUNCTIONAL DIAGRAM SMA SMX CONTROL SUBSYSTEM

6. CONTROL SUBSYSTEM CONTROL SUBSYSTEM SUPPORTS ALL THE COMOMN CONTROL FUNCTIONS OF EXCHANGE WHICH SETUP & RELEASE A CALL COMMON CONTROL FUNCTIONS ARE :- MR,TR,TX,MQ,GX & PC IN SOFTWARE FORM THEY ARE CALLED LOGICAL MACHINES HARDWARE COMPONENT IS CALLED MAIN CONTROL STATION SMC ANY ONE OR MANY CONTROL FUNTIONS CAN BE LOADED IN A HARDWARE STATION.

7. ROLE OF COMMON CONTROL FUNCTIONS THE MAIN CONTROL STATION SMC SUPPORTS THE FOLLOWING COMMOMN CONTROL FUNCTIONS FOR DOING THE DEFINED JOBS - MR CALL HANDLER(OVERALL CONTROLLER OF CALLSETUP & RELASE) - TR TRANSLATOR (DIGIT ANALYSIS & DATA ) - TX CHARGING DEVICE ( TAXING & METERS) - MQ MESSAGE DISTRIBUTOR (MARKING) - GX MATRIX SYSTEM HANDLER (SWITCHING) - PC CCS 7 SIGNALLING LINKS NETWORK CONTROLLER (MONITORING OF PUPE)

8. OM MQGXMRTXTRPC COM ETA PU PE SMT URM MCX CSNL CKTS LR ( 4MB / S) DT LR COMMUNICATION MULTIPLEX TMN 2 MB/S PCM CSND BT OCB-283 FUNCTIONAL DIAGRAM SMA SMX O & M SUBSYSTEM

9. HARDWARE ARCHITECTURE OF OCB-283

10. LINK TO TMN SMA 2 TO 64 STS 1x3 SMC SMM MCX SMX (1 TO 8)x2 MAS (1 TO 4) A&B MIS 1 A&B SMC (2 TO 32) SMT (1 TO 64)x2 OPERATION &MAINTENANCE TERMINALS CONTROL TERMINAL CIRCUITS VDU TTY 16 LR’S LR PCM CSNL CSND CSED 2TO 16 2 TO 4

11. OCB-283 COMPONENTS 1. SUBSCRIBER ACCESS UNIT CSN :- CALLED DIGITAL SUBSCRIBER CENTRE CSN –IT CAN BE LOCAL -> CSNL –OR DISTANT ->CSND 2.CIRCUIT TERMINATION UNIT SMT :-CIRCUITS ARE TERMINATED ON TRUNK MULTIPLEX CONNECTION UNIT ITS FUNCTION IS CALLED URM

12. 3. COMMON CONTROL UNITS: CALLED MAIN MULTIPROCESSOR CONTROL STATION SMC, CONTROL UNITS SUPPORT FOLLOWING CONTROL FUNCTIONS MR,TR,TX,MQ,GX,& PC IN SOFTWARE FORM 4. AUXILIARY UNITS:- CALLED SMA THESE UNITS SUPPORT FUNCTIONS FOR SIGNALS & TONES: ETA & PU/PE OCB-283 COMPONENTS

13. 5. SWITCHING MATRIX UNIT CALLED SWITCHING MATRIX STATION SMX COMPRISES OF – SWITCHING MATRIX-> MCX – SWITCHING SOFTWARE FUNCTION CALLED -> COM 6.OPERATION & MAINTENANCE UNIT SMM :- ITS FUNCTION IS CALLED OM 7. COMMUNICATION MULTIPLEX:- THESE ARE MIS & MAS OCB-283 COMPONENTS

14. LINK TO TMN SMA STS SMC SMM MCX SMX MAS MIS SMT OPERATION &MAINTENANCE TERMINALS CONTROL TERMINAL CIRCUITS VDU TTY PCM CSNL CSND CSED HARDWARE STATIONS OF OCB-283 CSN : SUBS.ACC UNIT SMC:MAIN CONTROL STATION SMA:AUXILIARY EQPT CONTROL STATION SMT:TRUNK CONTROL STATION SMX:MATRIX CONTROL STATION SMM:MAINTENANCE STATION STS:SYNCH. TIME BASE MIS:INTERSTATION COMM. MULTIPLEX MAS:STATION ACCESS COMM. MULTIPLEX SMC

15. LINK TO TMN SMA STS SMC SMM MCX SMX MAS MIS SMT OPERATION &MAINTENANCE TERMINALS CONTROL TERMINAL CIRCUITS VDU TTY PCM CSNL CSND CSED HARDWARE STATIONS OF OCB-283 CSN: SUBS. ACCESS UNIT SMC

16. LINK TO TMN SMA STS SMC SMM MCX SMX MAS MIS SMT OPERATION &MAINTENANCE TERMINALS CONTROL TERMINAL CIRCUITS VDU TTY PCM CSNL CSND CSED HARDWARE STATIONS OF OCB-283 CSN :SUBS.ACC UNIT SMC:MAIN CONTROL STATION SMC