GENERAL ARCHITECTURE OF OCB-283 SUBSYSTEMS FUNCTIONS OF

GENERAL ARCHITECTURE OF OCB-283 SUBSYSTEMS & FUNCTIONS OF OCB-283

GENERAL FUNCTIONAL BREAKDOWN OF ALCATEL 1000 E-10 (OCB-283) CCITT #7 SIGNALING NETWORK TELEPHONE NETWORK SUBSCRIBER ACCESS SYSTEM CONNECTION AND CONTROL DATA NETWORK VALUE ADDED NETWORK DISK PABX MAGTAPE OPERATION AND MAINTENANCE O&M NETWORK

OCB-283 ARCHITECTURE OCB-283 COMPRISES OF FOLLOWING 3 SUBSYSTEMS CCITT #7 SIGNALING • SUBSCRIBER ACCESS SUBSYSTEM • CONTROL & CONNECTION SUBSYTEM • OPERATION & MAINTENANCE SUBSYTEM NETWORK SUBSCRIBER ACCESS SYSTEM CONNECTION AND CONTROL TELEPHONE NETWORK DATA NETWORK VALUE ADDED NETWORK DISK PABX MAGTAPE OPERATION AND MAINTENANCE O&M NETWORK

INTRODUCTION OF OCB-283 • OCB-283 is the latest Electronics Digital ISDN type Switching technology being imported in INDIA • THIS IS MANUFACTURED BY M/S ALCATEL OF FRANCE • This Exchanage works on Stored Programme Control Principle. • Exchange can work with all types of Circuit & Subscriber Signallings & also provides for lot of novel facilities to the subscribers. • This exchange can work on Common Channel Signalling principle using the CCITT#7 reccommendations.

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

INTRODUCTION OF OCB-283 1. Subscriber Access Subsystem: • This is treated as an independent entity • Every Subscriber Connecting Equipment Rack has got its Signalling Point Number to operate in Common Channel Signalling mode with rest of the exchange Subsystems.

INTRODUCTION OF OCB-283 2. Control & Connection Subsystem is the block consisting of • A-CONTROL FUNCTIONS • B-CONNECTION & SWITCHING EQUIPMENTS

INTRODUCTION OF OCB-283 • A-CONTROL FUNCTIONS –COMPRISE OF COMMON CONTROL equipments which; –process –monitor –& control the call setup & release

INTRODUCTION OF OCB-283 –CONNECTION &SWITCHING BLOCK COMPRISES OF –Switching matrix equipment for performing digital time switcihing of speech path –Connection equipments for connecting PCM (digital) Junctions from; – other exchanges & – RSU’s – Auxiliary Equipments for Tones , Frequencies & other auxillaries for signalling protocol

INTRODUCTION OF OCB-283 3. OPERATION & MAINTENANACE SUBSYTEM : FOR O&M OF EXCHANGE BY OPERATORS

INTER NETWORKING WITH OTHER SYSTEMS • THE OCB-283 CAN BE CONNECTED TO ANY TECHNOLOGY SWITCHES PROVIDED -THEY CATER TO STANDARD SIGNALLINGS

STANDARD SIGNALLINGS • CHANNEL ASSOCIATED – STEP BY STEP – R 2 MF • COMMON CHANNEL SIGNALLING

LET US NOW UNDERSATAND COMMON CHANNEL SIGNALING BEFORE GOING FURTHER

OCB-283 FOLLOWS CCITT-NO 7 SIG. PROTOCOL FOR COMMON CHANNEL SIGNALING COMMON SIGNALING CHANNEL EXCHANGE B EXCHANGE A VOICE CHANNELS EXCHANGE C SIGNALING TIME SLOT LINK CARRIES ALL THE SIGNALING FOR ALL THE VOICE CHANNELS BETWEEN TWO EXCHANGES

OCB-283 USES COMMON CHANNEL SIGNALING BETWEEN ITS SUBSCRTIBER ACCESS SUBSYSTEM & REST OF THE EXCHANGE EQUIPMENTS LET US SEE HOW SUBS ACCESS UNITS - CSN’S USE COMMON CHANNEL SIGNALING CCS#7

CSN 2 CSN 3 PS 2 PS 1 COC PS 3 RSU EXCH. COMMON PS=255 (LOCAL) PS 4 CSN 1 CSN 5 PS 63 COC: - COMMON SIGNALING CHANNEL CSN 63 OCB-283 CCS SIGNALING POINTS IN REFERENCE TO OCB-283’s SUBSCRIBER ACCESS UNITS: CSNS

LOCAL CSN 3 CSN 2 CSN 1 PS 2 COC: - COMMON SIGNALING CHANNEL PS 1 CIC: - VOICE CHANNELS PS 3 RSU PS 4 CSN 4 EXCH 1 PS=2000 SP 1 CSN 5 COC 0 COC 1 COC: - COMMON SIGNALING CHANNEL PS 5 PS 63 CSN 63 EXCH 2 PS=3000 SP 2 OCB-283 NATIONAL STP PS-2033 PS= SIGNALING POINT NO STP=SIGNAL TRANSFER POINT CSNs ARE GIVEN LOCAL VERSION OF PS No. EXCHANGES & STP GET NATIONAL PSNo. CCS SIGNALING POINTS FOR OCB-283 IN NATIONAL NETWORK

functional architecture of oc. B-283

OCB-283 FUNCTIONAL DIAGRAM CSNL LR (4 MB / CSND S) 2 MB/S PCM SMX DT BT MCX LR SMT LR COM URM PU PE ETA CKTS SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

OCB-283 SWITCHING SYSTEM Any Automatic Switching System comprises in general of following distinct Subsystems : ------ • Subscriber Access Subsystem • Connection & Control Subsystem --- which comprises of (a) Switching Network Units (b) Circuit Connection Units (c) Common Control function units • Operation & Maintenance Subsystem In OCB-283 we can classify various units into following types according to the nature of their functions : - • Connection Units -These provide facility to connect a Speech path from a subscribers loop or circuits from an external PCM and transfers these Speech samples on to selected Time Slots called voice channels on a LR link (internal PCM) - These units are NAME FUNCTIONAL NAME (a) Subscriber Connection units CSNL, CSND, CSED (b) Circuit Connection Units SMT (URM ) (c) Tones & Frequency Receiver/ SMA ( ETA ) Sender & Common Channel Signaling SMA ( PUPE ) Protocol Handler • Switching Network These provides facility for CONNECTING the LRs (internal PCM’s) coming from connection units and performs Switching Operation for Calling Subs TS onto Called Subscriber TS & vice versa for a two way connection per call of telephony.

• Control Units - These units provide control of calls on the basis of Stored programs & they process the calls on reception of dialed digits from calling subscriber/ circuit & take part in handling of call setup & release by processing. monitoring, measuring charging of call & all other common control function s needed for working of an Automatic Common Control Exchange. - These Control units can comprise of following Functions FUNCTION NAME OF UNIT NATURE OF JOB MR : Multiregister TR : Translator MQ : Marker TX : GX : PC : Call-handler SET UP & RELEASE OF CALL Translation of digit , Data-bank of subs & ckts in files Message distribution between Common Control & Connection units Charger Computing the charge of a call, keeping meters Matrix System Handler Processes & makes connections in Switching matrix on the orders of MR or MQ Common Channel Signaling Manages the CCS#7 network for signaling Network Controller • O& M Units & Maintenance Peripherals : - In an Electronic Stored Programme Control Digital Exchange like OCB-283, all operation & maintenance activities are performed by a unit called O & M unit or OMC (Operation & Maintenance Center) - This provides access for Man Machine dialogues for the human operators to interact and command the working of Exchange Equipments.

SUBSCRIBER ACCESS SUBSYSTEM CSNL LR (4 MB / CSND S) 2 MB/S PCM SMX DT BT MCX LR SMT LR COM URM PU PE ETA CKTS SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

OCB-283 SUBSCRIBER ACCESS SUBSYSTEM • SUBSCRIBERS IN OCB-283 ARE CONNECTED ON “ DIGITAL SUBSCRIBER CENTER” CSN • CSN CAN BE LOCAL OR DISTANT • LOCAL CSN IS CALLED CSNL • DISTANT CSN IS CALLED CSND • SUBSCRIBERS CAN ALSO BE CONNECTED VIA A CSED • PABX OR CENTREX SUBSCRIBER CAN ALSO ACCESS TO OCB-283

CONNECTION SUBSYSTEM CSNL LR (4 MB / CSND S) 2 MB/S PCM SMX DT BT MCX LR SMT LR COM URM PU PE ETA CKTS SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

CONNECTION SUBSYSTEM • CONNECTION SUBSYSTEM COMPRISES OF SWITCHING MATRIX STATION SMX TRUNK MULTIPLEX STATION SMT AUXILIARY EQUIPT. STATION SMA & ALL ASSOCIATED LR LINKS

SWITCHING MATRIX STATION SMX • SMX IS THE STATION WHERE TWO WAY TS SWITCHING IS DONE • SMX HOLDS A SOFTWARE LOGICAL MACHINE MLCOM • SMX ARE PROVIDED IN DUPLICATE FOR THE DUPLICATED SPEECH PATH AS SWITCHING IS FULLY DUPLICATED IN OCB -283

TRUNK MULTIPLEX CONTROL STATION : SMT • SMT IS THE HARDWARE STATION WHERE THE EXTERNAL PCMS ARE TERMINATED • LOGICAL FUNCTION OF SMT IS URM • SMT CONVERTS EXTERNAL PCM’s (HDB 3) TO BINARY & VICEAVERSA & MAKES LR LINKS TOWARDS SMX FOR SWITCHING • SMT CAN CONNECT PCM’s FROM (a) CSND (RSU’S) OR (b)CSED (RLU’s) OR (c) PCM’s FROM A DISTANT EXCHNAGE

AUXILIARY EQUIPMENT UNITS: SMA • SMA IS THE HARDWARE STATION WHICH SUPPORTS FOLLOWING AUXILIARY EQUIPMENT FUNCTIONS : 1. ETA : : PROVIDES TONES FREQUENCY SENDER & RECEIEVER CONFERENCE CIRCUITS EXCHANGE CLOCK IN FIRST TWO SMA 2. PUPE : HANDLES COMMON CHANNEL SIGNALING LINKS CARRYING CCS 7 PROTOCOL ABOVE FUNCTIONS ARE CONNECTED TO SMX BY LR LINKS FOR SWITCHING

OCB-283 FUNCTIONAL DIAGRAM CSNL LR (4 MB / CSND S) 2 MB/S PCM SMX BT MCX CONTROL LR SMT COM SUBSYSTEM URM CKTS DT LR PU PE ETA SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

CONTROL SUBSYSTEM • CONTROL SUBSYSTEM SUPPORTS ALL THE COMOMN CONTROL FUNCTIONS OF EXCHANGE WHICH SETUP & RELEASE A CALL • COMMON CONTROL FUNCTIONS ARE : MR, 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.

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 SIGNALING LINKS NETWORK CONTROLLER (MONITORING OF PUPE)

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

OPERATION & MAINTENANCE SUBSYSTEM • O& M COMPRISES OF DUPLICATED HARDWARE STATION SMM & SOFTWARE MACHINE OM • IT IS THE PROCESSOR FOR OPERATION & MAINTENANCE OF EXCHANGE BY MAN MACHINE COMMANDS • SMM PROVIDES ACCESS TO OPERATOR THROUGH PERIPHERALS LIKE TTY, VDU • SMM ALSO HAS MAGTAPE & DISKS FOR STORAGE • THIS SUBSYSTEM CAN BE ACCESSED FROM REMOTE NETWORK MANAGEMENT CENTRE NMC OR TELECOM MANAGEMENT NETWORK TMN

OCB-283 FUNCTIONAL DIAGRAM CSNL LR (4 MB / CSND S) 2 MB/S PCM SMX DT BT MCX COMMUNICATION LR SMT MULTIPLEX COM LR PU PE ETA URM CKTS SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

COMMUNICATION MULTIPLEX • COMMUNICATION MULTIPLEX IS THE HIGHWAY OF COMMUNICATION BETWEEN VARIOUS HARDWARE STATIONS OF OCB-283 • IT WORKS ON THE PRINCIPLE OF TOKEN RING • THERE ARE TWO TYPE OF COMM. MULTIPLEXES – MIS – MAS

OCB-283 FUNCTIONAL DIAGRAM TIME BASE CSNL LR (4 MB / CSND S) 2 MB/S PCM SMX DT BT MCX LR SMT LR COM URM PU PE ETA CKTS SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

SYNCHRONISATION & TIME BASE • TIME BASE IS USED TO SYNCHRONISE THE LR LINKS • TIMEBASE IS GENERATED IN OCB BY STS EQUIPMENT • STS COMPRISE OF THREE OSCILLATOR CARDS PROVIDING TRIPLICATE TIME BASE • STS EQUIPMENT IS MOUNTED IN SMM RACK

OCB-283 FUNCTIONAL DIAGRAM CSNL LR SMX LINKS LR (4 MB / CSND S) 2 MB/S PCM DT BT MCX LR SMT LR COM URM PU PE ETA CKTS SMA COMMUNICATION MULTIPLEX TMN OM MQ GX MR TX TR PC

LR LINKS • LR LINKS ARE SPEECH CARRYING PCM LINKS WORKING INTERNALLY IN THE EXCHANGE BETWEEN CONNECTION UNITS & SWITCHING MATRIX SMX – CONNECTION UNITS ARE – CSNL SMT SMA • LR’s ARE PAIR OF UNIDIRECTIONAL DIGITAL TIME DIVISION MULTIPLEXED PATHS : – LRE -> ENTERING SMX – LRS -> LEAVING SMX • THESE CARRY 32 TIME SLOTS IN A TIME FRAME OF 125 MICROSECOND WITH 16 BITS PER TIME SLOT • LR’s WORK ON 4. 096 Mega Bits Per Second RATE • LR’s ARE ALSO CALLED MATRIX LINKS

IN OCB-283

CALL PROCESSING FUNCTIONAL EQUIPMENTS INVOLVED IN CALL HANDLING MCX CSNL CSND SC VC URM SC CSNL VC ETA SC COM CKTS PU/PE SC MAS TX TR MR MQ GX PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING NEW CALL ORIGINATION • TS-16 OF LR 0 &LR 1 OF CSN ARE SIGNALING CHANNELS SC BETN. CSN & THE EXCHANGE EQUIPMENT (PU/PE) ‘A’ CSNL CSND URM SC MCX VC VC COM MAS TR CSNL ETA CKTS TX SC ‘B’ MR MQ SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING NEW CALL ORIGINATION • TS-16 OF LR 0 &LR 1 OF CSN ARE SIGNALING CHANNELS SC BETN. CSN & THE EXCHANGE EQUIPMENT (PU/PE) • NEW CALL MESSAGE COMES ON SIG. CHANNEL SC ‘A’ CSNL CSND URM SC MCX VC VC COM MAS TR CSNL ETA CKTS TX SC ‘B’ MR MQ SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING CALLING SUBS. COS IDENTIFICATION • NEW CALL MESSAGE IS SENT TO MR BY PUPE. ‘A’ CSNL CSND URM SC MCX VC VC COM MAS TR CSNL ETA CKTS TX SC ‘B’ MR MQ SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING CALLING SUBS. COS IDENTIFICATION • NEW CALL MESSAGE IS SENT TO MR BY PUPE. • MR REQUESTS CALLING SUBSCRIBER DATA FROM TR. . OVER MIS • TR PROVIDES CALLING SUB’S COS DATA TO MR ‘A’ CSNL CSND URM SC MCX VC VC COM MAS TR CSNL ETA CKTS TX SC ‘B’ MR MQ SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING MCX SIDE ADDRESS OF VC • MR REQUESTS MQ TO PROVIDE ADDRESS OF VC ON MCX (LR-LRX CORRESPONDENCE) • MQ PROVIDES MCX SIDE ADDRESS TO MR ‘A’ CSNL CSND URM SC MCX VC VC COM MAS TR CSNL ETA CKTS TX SC ‘B’ MR MQ SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING DIAL TONE PROVISION TO CALLING SUBS. • MR ORDERS MCX FOR CONNECTING DIAL TONE TO CALLING SUBS. ON LRS-TS VC • DIAL TONE IS PROVIDED FROM MCX (DIALTONE GIVEN BY ETA’s TS-LRE TO MCX) ‘A’ CSNL CSND URM SC MCX VC DT COM CKTS MAS TX TR MR SC MQ SC SC GX CSNL ‘B’ ETA PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING RECEPTION OF FIRST DIGIT • FIRST DIGIT IS RECEIVED VIA VOICE CHANNEL VC IN RGF OF ETA (FOR DTMF SUBS. ) ‘A’ CSNL CSND URM SC MCX VC COM CKTS MAS TX TR CSNL SC MR MQ RGF SC SC GX ‘B’ ETA PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING RECEPTION OF FIRST DIGIT • FIRST DIGIT IS RECEIVED VIA VOICE CHANNEL VC IN RGF OF ETA (FOR DTMF SUBS. ) • ETA SENDS IT TO MR ON MAS • DIAL TONE IS CUT OFF ON ORDERS OF MR ‘A’ CSNL CSND URM SC MCX VC COM CKTS MAS TX TR CSNL SC MR MQ RGF SC SC GX ‘B’ ETA PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING DIGIT ANALYSIS • FIRST FEW DIGITS ARE PRE-ANALYSED ON REQUEST OF MR BY TR • REMAINING DIGITS MAY BE STILL BEING RECEIVED ‘A’ CSNL CSND URM SC MCX VC COM CKTS MAS TX TR CSNL SC ‘B’ MR MQ RGF SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING SELECTION • ANALYSIS OF DIGITS COMPLETED CALLED PARTY COS OBTAINED ROUTING OF CALL • MR ORDERS CSN-B TO TEST ‘B’ & GIVE VC FOR ‘B’ • CSN-B TESTS ‘B’ AND GIVES RINGING TO ‘B’ • MCX GIVES RBT TO ‘A’ CSNL A CSND URM SC MCX COM MAS TR B VC CKTS TX CSNL SC MR MQ RGF SC SC GX ‘B’ PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING CALLED PARTY ANSWERS • CALLED PARTY B GOES OFF HOOK • CALLED PARTY’S CSN SENDS LOOP CONDITION & VC-B INFORMATION TO MR OVER SC VIA PUPE • RINGING CURRENT & RBT ARE STOPPED ‘A’ CSNL CSND URM SC MCX VC-B VC-A COM CKTS MAS TX TR MR CSNL SC ‘B’ MQ RGF SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING BOTHWAY CONNECTION • TWO UNIDIRECTIONAL CONNECTIONS ARE ESTABLISHED IN MCX ON ORDER OF MR VIA GX BETWEEN VC-A & VC-B • ‘A’ & ‘ B ‘ CAN NOW CONVERSE ‘A’ CSNL CSND URM SC MCX VC-B VC-A COM CKTS MAS TX TR MR CSNL SC ‘B MQ RGF SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

CALL PROCESSING CHARGING (METERING) • TWO UNIDIRECTIONAL CONNECTIONS ARE ESTABLISHED IN MCX ON ORDER OF MR VIA GX • ‘A’ & ‘ B ‘ CAN NOW CONVERSE • CHARGING IS STARTED BY TX - MR RELEASED ‘A’ CSNL CSND URM SC MCX VC-B VC-A COM CKTS MAS TX TR MR CSNL SC ‘B MQ RGF SC SC GX PU/PE PC MIS OM SC: Signalling channel VC: Voice channel

OCB-283 EXCH AND YOUR METER IS RUNNING HERE!!!

HARDWARE ARCHITECTURE OF -283 OCB

HARDWARE ARCHITECTURE OF OCB-283 16 LR’S CSNL PCM CSND 2 TO 16 CSED STS 1 x 3 MCX SMT (1 TO 64)x 2 2 TO 4 SMA 2 TO 64 CIRCUITS LR SMX (1 TO 8)x 2 LR MAS (1 TO 4) A&B SMC (2 TO 32) MIS 1 A&B VDU TTY SMM OPERATION &MAINTENANCE TERMINALS LINK TO TMN CONTROL TERMINAL

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

OCB-283 COMPONENTS • 3. COMMON CONTROL UNITS: CALLED MAIN MULTIPROCESSOR CONTROL STATION SMC , CONTROL UNITS SUPPORT FOLLOWING CONTROL FUNCTIONS MR, 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 • 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 &

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

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

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

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

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 CSNL CSND MCX PCM CSED STS SMX SMT SMA CIRCUITS MAS SMC VDU TTY OPERATION &MAINTENANCE TERMINALS LINK TO TMN SMC MIS SMM CONTROL TERMINAL

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

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

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

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

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

STANDARD CONFIGURATIONS OF OCB-283 COMPACT (C) CONFIGURATION SMC SMA SMT SMX : : 2 2 1 1 (48 LR) SMC CAN BE LOADED WITH MR, TX, MQ, GX &PC SOFTWARE SMA CAN BE LOADED WITH ETA, PUPE SOFTWARE PERFORMANCE DATA: 5 CA/S OR 18000 BHCA CSNL CSND MCX PCM CSED SMT STS SMX SMA M IS CIRCUITS SMC VDU TTY SMM OPERATION &MAINTENANCE TERMINALS CONTROL TERMINAL LINK TO TMN

STANDARD CONFIGURATIONS OF OCB-283 SMALL ( P) CONFIGURATION SMC SMA SMT SMX : : 2 +1 BACKUP 2 1 1 SMC CAN BE LOADED WITH MR, TX, MQ, GX &PC SOFTWARE SMA CAN BE LOADED WITH ETA, PUPE SOFTWARE PERFORMANCE DATA: 36 CA/S OR 1, 30000 BHCA CSNL CSND PCM CSED STS MCX SMT SMX SMA CIRCUITS MAS SMC VDU TTY OPERATION &MAINTENANCE TERMINALS LINK TO TMN SMC MIS SMM CONTROL TERMINAL

STANDARD CONFIGURATIONS OF OCB-283 MEDIUM (M) CONFIGURATION SMC SMA SMT SMX : : 2 OR 3 MR+2=5 2 OR MORE 1 OR MORE 2 SMC’S CAN BE LOADED WITH TR, TX, MQ, GX &PC SOFTWARE SMA CAN BE LOADED WITH ETA, PUPE SOFTWARE PERFORMANCE DATA: 100 CA/S OR 3, 60000 BHCA CSNL CSND MCX PCM CSED STS SMX SMT SMA CIRCUITS MAS SMC VDU TTY OPERATION &MAINTENANCE TERMINALS LINK TO TMN MIS SMM CONTROL TERMINAL

STANDARD CONFIGURATIONS OF OCB-283 LARGE (G) CONFIGURATION SMC SMA SMT SMX : 4 TO 7 MR+2 TX+2 SMC : 2 OR MORE : 1 OR MORE 2 SMC CAN BE LOADED WITH TR, MQ, GX &PC SOFTWARE SMA CAN BE LOADED WITH ETA, PUPE SOFTWARE PERFORMANCE DATA: 220 CA/S OR 800, 000 BHCA CSNL CSND MCX PCM CSED STS SMX SMT SMA CIRCUITS MAS SMC VDU TTY OPERATION &MAINTENANCE TERMINALS LINK TO TMN SMC MIS SMM CONTROL TERMINAL

SWITCHING PRINCIPLE AND DESIGN OF OCB-283

SWITCHING PRINCIPLE • 1. OCB-283 SWITCH WORKS ON SINGLE STAGE TIME SWITCHING PRINCIPLE CALLING PARTY’S TIME SLOT X LRE (X) CALLING PARTY’S TIME SLOT X LRS (X) INCOMING LINKS Y LRE (Y) CALLED PARTY’S TIME SLOT OUT GOING LINKS Y LRS (Y) CALLED PARTY’S TIME SLOT • 2. OCB-283 SWITCH PERFORMS SWITCHING IN TWO PARELLEL SWITCHING EQUIPMENTS SIMULTANEOUSLY FOR EVERY CALL

SINGLE STAGE TIME SWITCH CONCEPT TS 2047 X TS 0 INCOMING LINK CARRYING TIME SLOTS OF 64 INTERN LINK EACH OF 32 TIME SLO INLET Sequential Write 0 1 SPEECH BUFFER MEMORY X SPEECH OF X Controlled Read C O N T R O L U N I T X 64 x 32 -1 =2047 Y TS 2047 OUT LET X 0 1 Controlled Write X X TS 0 OUTGOING LINK CARRYING 2048 TIME SLOTS OF 64 INTERNAL LINK EACH OF 32 TIME SLOTS Y CONTROL MEMORY Sequential Read Y X-->Y UNIDIRECTIONAL 64 x 32 -1 =2047

SMX-A CONNECTION UNIT ‘X’ SAB A LRS X(A) LRE X(A) X LRE Y(A) SAB B MLCOM LRS Y(A) LRS X(B) CONNECTION UNIT ‘Y’ SAB A LRE X(B) LRE Y(B) Y SAB B LRS Y(B) SWITCHING IN OCB-283 IN TWO BRANCHES OF SMX MLCOM SMX-B

TYPICAL OCB-283 EXCHANGE 0 GLR( A & B) 3 4 CSNL PCMS SMT 1 0 1 2 3 0 S 1 M 2 X 1 SMX 1 B A 5 6 7 8 MAS 2 (A & B) GLR (A & B) SMA SMA 1 2 3 MAS 1 (A & B) SMC 1 SMC 2 SMC 3 SMC 4 SMC 5 MIS A & B SMMA OCB-283 DIAGRAM EXCHANGE SMMB TOKEN RINGS MIS MAS 1 & MAS 2

CSNL 0 1 SMT GLR( A & B) 0 1 2 3 3 4 0 S 1 M 2 X 1 SMX 1 B A 5 6 7 8 MAS 2 (A & B) GLR (A & B) SMA SMA 1 2 3 SPEECH PATH IN OCB-283 SMC 1 SMC 2 SMC 3 SMC 4 SMC 5 MIS A & B SMMA OCB-283 EXCHANGE SMMB TOKEN RINGS MIS MAS 1 & MAS 2

NETWORK LINK LR’s (GROUP OF LR’s) SUBSCRIBER. ACCESS GLR 0 B CSNL SMX GLR 1 B 1 GLR =8 LRs GLR 0 A 2 1 B B 1 0 G LR SMT AUXILIARY SMA EQPT SW H SW GLR OA 1 A SWITCHING MATRIX A CIRCUIT CONNECTION EQPT. GLR OB 2 A IT C 3 2 1 PCM B 8 A 0 G LR A 3 2 PCM 8 B CH B SMX IT GLR 1 A SPEECH PATH IN OCB-283

SPEECH PATH IN OCB-283 • SPEECH PATH IN OCB-283 CONSISTS OF – SUBSCRIBER ACCESS UNITS CSNs – TRUNK MULTIPLEX CONNECTION STATION UNITS SMTs – AUXILIARY EQUIPMENT STATION UNITS SMAs – SWITCHING MATRIX STATIONS SMXs – NETWORK LINKS LR’s

SUBSCRIBER ACCESS IN OCB-283 CSNL & CSND CONFIGURATION CSNL 256 SUBS CNE CNL 256 SUBS CSN BASIC RACK OCB-283 PCM 256 SUBS CNL 256 SUBS. CNE PCM CSND SWITCH CSN BASIC RACK PCM

NK LR SM S X TO SUBSCRIBER ACCESS UNITS CSNL OR CSND RACKS LI BASIC RACK T C R M T TOND UCX 0 UCX 1 GTA T C R M T CNL OR ICNE T C R M T CNL OR ICNE T C R M T CNL OR ICNE EXTENSION RACKS

LI NK LR SM S X TO SUBSCRIBER ACCESS UNITS CSNL OR CSND RACKS T C R M T TOND UCX 0 UCX 1 GTA CNL OR ICNE T C R M T CNL OR ICNE CNL OR ICNE T C R M T T C R M T CNL OR ICNE T C R M T CSN BASIC RACK

CSNL OR CSND SHELF NAMES POWER BASIC RACK SUPP INTERFACE T C R M T TOND INTERFACE WITH EXCHANGE TBALAM T C R M T TBUCN T C R M T TBABM 2 CNL OR ICNE T C R M T TBABM 2 UCX 0 UCX 1 GTA CNL OR ICNE

GLR TO SMX B SMX A GLR 0 &1(A) AUX. EQPT GLR 0&1(B) CONTROL LOGICS T C R M T TOND UCX 0 UCX 1 GTA CNL OR ICNE PCM CNE T C R M T CNL OR ICNE SUBS. CONNECTION SHELFS T C R M T CSN BASIC RACK FOR CSNL 1 GLR= 8 LRS TWO GLR/CSN

CSN HARDWARE CONFIGURATION UCN DIGITAL CONTROL UNIT CSND BASIC RACK T B A L A N T B U C N IN CASE OF CSNL TCILR TOND 80 (0) ~ 40 V T T R S 13 12 9 8 T T R S 15 14 11 10 T C C O B TOND 80 (1) ~40 V T C C S T P U C B T M U C 2 M T M Q R T R C X IN CASE OF CSNL T R C X T S U C T R C X T M Q R T M U C 2 M T P U C B T C C S TCBTL 7 6 T T R S 1 T T R S 3 T C C S T H L R 5 4 T H L R T T R S 0 T T R S 2 T R F 8 B * UCX 0 UCX 1 T B T D B A T R F 8 B * T F I L M B * GTA T C R M T T P O S T C R M T T M L A B T S U R V 2 T 5 V 1 7 T S U R V 2 T C R M T * PCB’S NOT USED IN CSNL

2 ~ 16 PCMS TOWARDS EXCHANGE CONTROL LOGICS T C R M T TOND UCX 0 UCX 1 GTA CNL OR ICNE PCM CNE T C R M T CNL OR ICNE CSN BASIC RACK FOR CSND SUBS. CONNECTION SHELFS T C R M T AUX. EQPT 1 GLR= 8 LRS TWO GLR/CSN

CSN EXTENSION RACK LOCALSUBSS. CONCENTRATOR CNL OR ICNE REMOTE SUBS. CONN. CNE CNL OR ICNE REMOTESUBSS. CONCENTRATOR INTERFACE PCM CNL OR ICNE

EXPANDED VIEW OF C N L SHELF CNL OR ICNE CNL OR ICNE TT T T AA A A BB B B AA A A 01 TTT P HH OLL L RR T A B A TT T AA C BB R AA M 15 T

DETAILS OF CN SHELF SUBSCRIBER CARDS 16 SUBS / CARD MAX. 16 CARDS T TTT A AAA B BBB A AAA CN TT TT P H HA OL L B LR RA TT AC BR AM T : - DIGITAL SUBS. CONCENTRATOR MAXIMUM 256 SUBS. /SHELF

SWITCHING MATRIX STATION : SMX • SWITCHING MATRIX SYSTEM CONSISTS –HOST SWITCHING MATRIX MCX IN SMX * MCX PROVIDES: • 16 BIT DIGITAL SWITCHING • MATRIX OF 2048 x 2048 LR’S –IT HOLDS THE MLCOM SOFTWARE • SMX GETS 4. 096 MBITS/S MATRIX LINKS (LRs) IN THE FORM OF GROUP OF 8 LRs CALLED GLR • SWITCHING IN IS DONE SIMULTANEOUSLY IN TWO BRANCHES (A & B) OF INDEPENDENT SWITCHES • BRANCH AMPLIFICATION & SELECTION FUNCTION SAB FOR CONNECTING LR s TO SMXs OF RESPECTIVE BRANCH IS SITUATED IN CONNECTION UNITS • THERE ARE 8 MODULAR SWITHES CALLED SMX 1 TO SMX 8 IN EACH BRANCH

SWITCHING MATRIX SCHEMETIC • SINGLE STAGE TIME SWITCHING • SWITCHING CAPACITY-2048 LR’S • 1 LR IS 32 CHANNEL PCM - 30 USED FOR VOICE LR 0 LR 255 . T. 1 LR 0 LR 255 2 3 4 COM 5 6 7 LR 2047 8 LR 2047

256 x 256 SQUARE MATRICES LRE 0 LRS 0 LRE 255 LRS 255 SMX 1 LR E 256 LRS 256 LRE 511 LRS 511 SMX 2 LRE 512 LRS 512 LRE 767 LRS 767 SMX 3 LRE 768 LRS 768 LRE 1023 LRS 1023 SMX 4 SWITCHING MATRIX BLOCK DIAGRAM

128~191 0~63 I/L 64 x 64 0~63 O/L 256 x 256 SQUARE MATRIX EXPANDED VIEW 64 x 64 BASIC SQUARE MATRIX 64~127 O/L 128~191 O/L 192~255 O/L 64~127 192~255

TWO WAY SWITCHING OF TIME SLOTS OF X->Y & Y->X IN SINGLE STAGE TIME SWITCH OF OCB-283 SWITCHING FROM X-Y TS 2047 X I/C LINK CARRYING 2048 TIME SLOTS OF 64 LRE LINK EACH OF 32 TIME SLOTS TS 0 INLET W 0 1 SPEECH OF X R C O N T R O L U N I T TS 2047 SPEECH BUFFER MEMORY Y TS 0 CONTROL MEMORY y 64 x 32 -1 =2047 C O N T R O L U N I T I/C LINK CARRYING 2048 TIME SLOTS OF 64 LRE LINK EACH OF 32 TIME SLOTS 0 1 R 0 1 X TS 0 SPEECH OF Y X TS 2047 W Y INLET W 64 x 32 -1 =2047 OUT LET R SWITCHING FROM Y-X SPEECH BUFFER MEMORY Y 64 x 32 -1 =2047 OUT LET TS 2047 W X TS 0 0 1 CONTROL MEMORY R Y X 64 x 32 -1 =2047 SWITCH OF Y SWITCH OF X BASIC 64 x 64 SQUARE MATRIX CORRESPONDING TO LRE OF Y

SWITCHING RACKS OF OCB-283 (FOR 1024 LRS ) 4 SMX SWITCHES IN EACH BRANCH B BRANCH SMX 1 SMX 3 SMX 5 SMX 7 SMX 2 SMX 4 SMX 6 SMX 8 SMX 1 (EX) SMX 2 (EX) SMX 5 (EX) SMX 7 (EX) SMX 2 (EX) SMX 4 (EX) SMX 6 (EX) SMX 8 (EX) A BRANCH

AUXILIARY EQUIPMENT UNITS: SMA • SMA IS THE HARDWARE STATION WHICH SUPPORTS AUXILIARY EQUIPMENT FUNCTIONS -(DOING FOLLOWING JOBS) 1. ETA : PROVIDES TONES : FREQUENCY SENDER & RECEIEVER : FIRST TWO SMA KEEP EXCHANGE CLOCK 2. PUPE : HANDLES COMMON CHANNEL SIGNALING CCS 7 PROTOCOLS OF COMMON CHANNEL SIGNAL DATA LINKS. • IN PHYSICAL FORM ONE SMAOCCUPIES ONLY ONE SHELF OFA RACK • SMA IS CONNECTED TO SWITCHING MATRIX BY ONE GLR (= 8 LR’s) • THESE LR’s : CARRY TONE, FREQUENCY RECEIEVER / SENDER, CONFERENCE CIRCUIT TIME SLOTS FOR ETA & CARRY COMMON CHANNEL SIGNALING TIME SLOTS FROM THE MATRIX (COMING ON DATA LINKS ESTABLISHED IN MATRIX ) TO PUPE • SMA IS CONNECTED ON MAS COMMUNICATION MULTIPLEX FOR COMMAND CONTROL

SMA : AUXILIARY EQPT. STATION IN OCB-283 SMC SMA SHELF SMC SMA

TRUNK MULTIPLEX CONTROL STATION : SMT • SMT IS THE HARDWARE STATION WHERE THE EXTERNAL PCMS ARE TERMINATED • SMT HARDWARE IS FULLY DUPLICATED IN TWO LOGICS • IT OCCUPIES TWO SHELVES OF A RACKS • THERE ARE TWO GENERATIONS OF SMT’s – SMT 1 G CAN CATER TO 32 PCMS – SMT 2 G CAN CATER TO 128 PCMS SMC SMT(A) SMT(B) PCM TER MIN ATIO ON

CONNECTING OF AUTOMATIC DIGITAL ANNOUNCEMENT IN OCB-283 • • • AUTOMATIC ANNOUNCEMENTS ARE PROVIDED IN OCB-283 AT THE SWITCHING MATRIX IN THE FORM OF DIGITAL RECORDED VOICE MESSAGES STORED IN PCB’s THERE ARE TWO PCB’s : - ICMPN 2 ->RAM & VOLATILE MEMORY ICSMP ->EPROM SAVES VOICE-ANN. ( DIGITAL ) THESE TWO CARDS ARE SITUATED IN SMM RACK & THE ANNOUNCEMENTS ARE CARRIED BY ONE PCM LINK FROM ICMPN 2 CONNECTED TO ONE SMT; FROM SMT LINK GOES AS LR LINK TO SMX WHERE ITS TIME SLOTS ARE USED FOR GETTING THE RESPECTIVE ANNOUNCEMENTS. LR LINKS SMM RACK SMX RACK PCM SMT RACK SMT PCM DDF

CONTROL STATIONS OF OCB-283 CSNL PCMS 0 1 SMT GLR( A & B) 0 1 2 3 SMC 1 3 4 0 S 1 M GLR (A & B) MAIN MULTI PROCESSOR CONTROL STATIONS : SMC 2 SMC 3 SMC 4 SMC 5 MIS A & B SMMA OCB-283 DIAGRAM EXCHANGE SMMB TOKEN RINGS MIS MAS 1 & MAS 2 OCB-283 BLOCK DIAGRAM

MAIN CONTROL STATION: SMC IS THE HARDWARE STATION FOR LOADING COMMON CONTROL FUNCTIONS MR, TR, MQ TX, GX, & PC IN SOFTWARE FORM IN PHYSICAL FORM ONE SMC OCCUPIES ONLY ONE SHELF OF A RACK SMC SMC SMA

MAINTENANCE STATIONS OF OCB-283 CSNL PCMS 0 1 SMT GLR( A & B) 0 1 2 3 3 4 0 S 1 M 2 X 1 SMX 1 B A 5 6 7 8 MAS 2 (A & B) MAS 1 SMC 2 SMC GLR (A & B) SMA SMA 1 2 3 MAINTENANCE STATIONS SMM A&B MIS A & B SMMA SMMB OCB-283 BLOCK DIAGRAM

MAINTENANCE STAIONS SMM(A) & SMM(B) • SMM STATION IN OCB-283 PERFORMS THE O&M FUNCTIONS • THE SMM STATION HAS FULL DUPLICATED HARDWARES SMM (A) & (B) • ONE OF THE TWO SMM IS PILOT & OTHER WORKS AS HOT STAND-BYE • FOR BOTH SMM THERE ARE TWO MIRROR IMAGE HARD DISKS OF 1200 MB CAPACITYPILOT IS ABLE TO ACCESS EITHER OF DISKS • THERE ARE TERMINATIONS FOR PERIPHERALS TTY, VDU FOR OPERATION • THERE ARE UPTO 4 ALARM RECEPTION RINGS

MAINTENANCE STAIONS SMM(A) & SMM(B) • SMM DIALOGUES WITH ALL SMC’S OVER MIS TOKEN RING • ADJACENT TO SMM THERE IS ONE MAGTAPE DRIVE UNIT : DBM • THERE IS ONE STREAMER FOR CARTRIDGE DRIVE IN SMM RACK • SMM RECEIVES ALL ALARMS FROM WHOLE EXCHANGE ON ALARM RING MAL • SMM STATION OCCUPIES 3 SHELVES OF A RACK • SMM RACK ALSO HAS DIGITAL VOICE ANNOUNCEMENT SYSTEM IN 4 TH SHELF

MAINTENANCE STAIONS SMM(A) & SMM(B) • SMM A&B ALONGWITH ALARM RING & ANNOUNCEMENT CARDS OCCUPIES THREE SHELVES OF A RACK • SMM RACK ALSO KEEPS STS EQPT. • DBM RACK IS INSTALLED ADJACENT TO THIS STS DISK 1 SMM A ALARMS ANNOUNCE SMMB PERIPH DISK 2

COMMUNICATION MULTIPLEXES CSNL 0 1 SMT GLR( A & B) 0 1 2 3 PCMS 0 S 1 M 2 X 5 1 6 SMX 1 B A 7 8 MAS 2 (A & B) MAS 3 4 GLR (A & B) SMA SMA 1 2 3 MAS 1 (A & B) SMC 1 SMC 2 SMC 3 SMC 4 SMC 5 MIS A & B MIS SMMA OCB-283 DIAGRAM SMMB TOKEN RINGS MIS MAS 1 & MAS 2 MAL MAS : MAS CAN BE FROM 0 TO 4 RINGS & ARE DUPLICATED AS A & B MIS : MIS IS ONE RING DUPLICATED AS A & B MAL : ALARM RINGS CAN BE UPTO 5 AND DUPLICATED AS A & B

COMMUNICATION MULTIPLEXES • COMMUNICATION MULTIPLEXES ARE THE HIGHWAYS OF COMMUNICATION BETWEEN VARIOUS CONTROL STATIONS OF OCB-283 • THERE ARE THREE TYPE OF COMMUNICATION MULTIPLEXES: – MAS TOKEN RING : -STATION ACCESS MULTIPLEX , IT IS BETWEEN • CONNECTION STATIONS (EXCEPT CSN) AND ALL SMC’s • SWITCHING STATIONS AND ALL SMC’s – MIS TOKEN RING : - INTERSTATION MULTIPLEX, IT IS BETWEEN ALL SMC’s AND SMM – MAL RING : -ALARM MULTIPLEX RING, IT IS FOR COLLECTING H/W ALARMS OF ALL STATIONS EXCEPT CSN • NOTE: - ALL COMMUNICATION BETWEEN CSN & REST OF THE EXCHANGE EQUIPMENTS IS DONE VIA COMMON SIGNALING CHANNELS CALLED COC: -COC 0= (TS 16 -LR 0 )& COC 1=(TS 16 -LR 1)

PCWAM • PCWAM : PERSONAL COMPUTER WORK ACCESS METHOD • IT IS A SPECIAL SOFTWARE LOADED IBM PC • IT IS THE TERMINAL OF SMM WHICH IS CONNECTED TO S-BUS OF SMM DIRECTLY • IT IS USED FOR HARDWARE TESTING/LOCAVAR OF SMM COMPONENTS : SMM STATION, HARD DISK, MAGTAPE MIS SMM CONTROL TERMINAL PC WAM

PGS / T I • PGS / T I : GENERAL VISUAL DISPLAY CUM INTELLIGENT TERMINAL • IT IS A SPECIAL SOFTWARE LOADED IBM PC • IT IS ONE OF THE PERIPHERAL TERMINAL OF SMM WORKING ON ASYNC. LINE FOR O&M • IT SHOWS THE GENERAL DISPLAY OF ALARMS IN EXCHANGE • IT PROVIDES ASSISTANCE IN MAN-MACHINE COMMANDS IN TI: INTELLIGENT MODE MIS SMM CONTROL TERMINAL PGS/TI

CONTROL TERMINALS CONTROL TERMINASL • THESE ARE SYSTEM VIDEO TERMINALS CONNECTED TO SMM • THESE ARE USED FOR MANUAL RESTART & STOPPING OF SMM • THESE INTERACT DIRECTLY WITH ‘REAL TIME OPERATING SYSTEM’ OF SMM COMPUTER MIS SMM CONTROL TERMINAL

OPERATORS VDU TERMINALS OPERATORS TERMINASL • THESE ARE ORDINARY VIDEO TERMINALS CONNECTED TO SMM ON LAS LINKS • THESE ARE USED BY THE OPERATORS FOR GIVNING MA-MACHINE COMMANDS FOR NAORMAL OPERATION & MAINTENANCE OF THE OCB-283 EXCHANGE • THESE ARE PROVIDED WITH A ORINTER FOR TAKING THE HARD COPY • UPTO 32 OPERATORS TERMINALS CAN BE PROVIDED IN A EXCHANGE MIS SMM CONTROL TERMINAL VDU PRINTER

MAINTENANCE COMMANDS HARDWARE EQUIPMENT’S STATUS INTERROGATION @ TELIN: @ AFUR=1<63; GLR A&B @ ESMIN: @ AM=SMT; OR @ AM=SMTx; OR @ AM=SMTAx; OR AM=SMTBx; @ ESMIN: @ AM=SMC; OR @ AM=SMCx; OR @; OR CSNL SMT @ ESMIN: @ AM=SMX; OR AM=SMXn; OR AM=SMXAn; OR AM=SMXBn; @ ESMIN: @AM=SMA; OR AM=SMAx; GLR A&B 0 1 3 4 0 1 2 3 5 6 7 8 0 1 2 SMX 1 A S M X 1 B SMA 1 SMA 2 SMA 3 MAS 2 (A & B) MAS 1 (A & B) SMC 1 @ AM=SMM; OR SMMA; OR SMMB; SMC 2 SMC 3 SMC 4 MIS A & B SMMA OCB-283 DIAGRAM SMMB @ AMXIL: @ AMX=MIS; OR AMX=MAS; OR AMX= MISA OR AMX=MISB SMC 5 OR AMX=MASAn; OR AMX=MASBn; TOKEN RINGS MIS MAS 1 & MAS 2

ADDRESSING OF GLR ‘s WITH RESPECT TO CONNECTION UNITS & WRT TO SMX IN OCB-283 SOFTWARE AFGRU=UR-GLR CSNn AFUR=n AFGRU=n-0 AFGRX=1 -2 AFGRU=n-1 AFGRX=1 -3 AFGRX=1 -15 AFGRX=1 -29 AFGRA=SMA-GLR SMAn AFGRX=SMX-GLR AFGRA=n-0 AM=SMAn AFGRX=2 -8 AFGRX=2 -11 0 1 2 3 SMX 1 ( A &B) 31 SMX 2 ( A &B) AFGRX=3 -3 AFGRT= SMT-GLR SMX 3 ( A &B) AFGRT=n-0 PCM AFGRT=n-1 SMTn AFGRT=n-2 AM=SMTn AFGRT=n-3 SMX 8 ( A &B) CONNECTION OF LR’s IN THE FORM OF GROUP OF LR’s-> GLR TO SWITCHING MATRIX STATION SMX

OCB-283 SWITCHING SUBSYSTEM PROTECTION OF CONNECTIONS IN SPEECH PATH 1. CHECKING OF CONNECTIONS : *THERE ARE TWO TYPES OF CHECKS - PERMANENT CHECK -> ->ALWAYS ACTIVE FOR ALL CHANNELS - CHECK ON REQUEST -> -> ACTIVATED ON DEMAND CONCERNS TO ONLY LIMITED CHANNELS *METHODS OF CHECKING CHECK BY COMPARISON OF BRANCHES MEANS: - PARITY TYPE : - PERMANENT TRANSMISSION CHECK IN EACH BRANCH SEPARATELY SIMPLE PARITY PERMANENT SOPHISTICATED CRC ON REQUEST

SWITCHING IN OCB-283 DEFINITION OF ADDITIONAL BITS IN SAB FUNCTION ADDITIONAL BITS 8 SPEECH BITS S A B TSi 3. 9 mics LAE LAS CONNECTION UNIT 0 8 SP 8 ADD SMX TSi 3. 9 mics LRE A&B LRS A&B 1 2 3 4 5 6 8 SPEECH BITS 7 MODES OF OPERATION PERMANENT MODE BIT 13 =0 BIT 14=0 (HOMOLOGOUS RESULT 8 9 10 11 12 13 14 15 ADDITIONAL 8 BITS MULTIFRAME MODE BIT 13=1 (SYNC WORD) BIT 14=CONTROL BIT OF LRS A&B TSi ON LRE-TSi : IF NOT, =1) BIT 15= PARITY BIT 15= CRC BIT

PHYSICAL DIMENSIONS OF OCB-283 Rack Size in : 2000 Hx 950 Wx 690 D (mm) No of Rows (Suits) in a Switch Room : Not Fixed No of Racks per suite : Not Fixed but for practical convenience may be limited upto 16 Inter Suite Gap : Min. 800 mm to 1000 mm Max: - Variable Clearance from Sidewalls : 1500 mm Height of Ceiling Minimum : 3000 mm Approximate floor area for a 6 k exchange : 44 sq m Sequence of lay out of racks in suites : No special sequence or restriction (other than specific to site) except for following CA & DBM racks to be installed together preferably in middle of Suites of racks XA Racks to be installed in continuity & in Identical locations in two suites for the branches A & B

OCB-283 RACKS - Front View CA CB CC SMC SMC STS SMC SMX 1 SMT-A SMC SMX 2 SMT-B AL ANN PER SMA SMC SMX E SMT-A SMMB 2000 mm DBM SMA SMC SMX E SMT-B Only SMX’s 1 SMC+ 2 SMT’s SMMA 1 SMC +STS+SMMA/B MTU 3 SMC + 2 SMA 5 SMCs XA UA SMC UB UC UD CSN-BASIC CSN-EXTN. SMC SMC UCN CNL 4 SMT-A CNL 0 CNL 5 SMT-B SMA SMT-B CNL 1 CNL 6 SMA SMT-A CNL 2 CNL 7 SMA SMT-B CNL 3 CNL 8 1 SMC+ 2 SMT’s UCN+ 4 CNL(ICNE) 5 CNL(ICNE) 1 SMC+1 SMT +2 SMA 1 SMC+ 4 SMA

LAY OUT OF AN OCB-283 SWITCH ROOM EXAMPLE : -BOMBAY SION TELEPHONE EXCHANGE SWITCH ROOM ALL DIMENSIONS IN MM 1500 TR 07 UE 1 CSN 020 800 690 TR 06 DBM CA UC 1 SDE 1 CB 1 XA 1 A XA 2 A CSN 011 CSN 010 UD 1 UC 2 XA 1 B XA 2 B CSN 050 CSN 041 CSN 040 CSN 031 5 4 3 2 950 TR 05 CSN 061 TR 04 16 15 14 13 12 11 10 9 VDU OPERATION ROOM 8 CSN 060 7 VDU CSN 051 6 VDU CSN 030 1 I R P ACDB

CONNECTION UNITS’ UR DESIGNATION NUMBERING IN OCB-283 TYPE OF CONN. UNIT CSN SMT S/W MACHINE MLCSN MLURM STARTING FROM HIGHEST UR NO FOR FIRST MODULE OF FIRST SMA RANGE OF UR NO. S 1 TO 63 1 UR PER CSN 223 TO 64 8 MODULE OR UR NO PER SMT FOR SMT 1 G & 32 MOD. OR UR PER SMT-2 G MLETA/ 256 TO 224 MLPUPE 1 UR NO PER SMA UR NUMBERING SCALE 1234 CSN 1~63 UR # 63 64 223 224 SMT 20 SMT 1 SMA 32 256 SMA 1

DIMENSIONING OF OCB-283 • CALCULATING LR ‘s MODULARITY OF LR’s (30 voice channel carrying links) Minimum 8 LRs called GLR can be installed TYPE OF CONN. UNIT LR REQUIRED GLRS CSNL 16 2 SMT 1 G 32 4 SMT 2 G 128 16 SMA 8 1 Calculate based upon Total Subscriber Number & TRAFFIC PER LINE the No of CSNL racks required & GLRs Calculate based upon the projected circuit traffic the total No of Circuits needed & Calculate No of SMTs & GLRs Calculate based upon the projected Signalling traffic the total No of RF & PUPE needed & Calculate No of SMAs & GLRs

DIMENSIONING OF OCB-283 • CALCULATING SWITCHING MATRIX SIZE MODULARITY OF SMX : - Maximum 256 LRs or 32 GLRs/SMX XA RACK: - 2 SMX STATIONS/ XA RACK RCID CARD SLOTS PER XA RACK =32 TOTAL NO OF SMX STATIONS REQUIRED = TOTAL GLRs/32 TOTAL NO OF XA RACKS NEEDED =TOTAL SMXs/2 WITHIN SMX MODULARITY OF : RCID CARD 16 LRs or 2 GLRs RCMT CARD 64 LRs or 8 GLRs RCSM CARD 4 PER SMX (IN STEPS OF 1 RCSM/ PAIR OF RCSM FROM RCMT 0 TO RCMT 7 ) IF GLRs >128 THEN MORE THAN 16 RCMT NEEDED AND SECOND SHELF OF EACH SMX WILL BE USED WITH MORE RCMT’s & RCSMs CARDS AS PER SIZE + 1 RCMP

DIMENSIONING OF OCB-283 • CALCULATING SMA MODULARITY OF SMA MINIMUM 2 SMA -> SMA 1 & SMA 2 ( ALWAYS NEEDED) NO OF SMA NEEDED DEPENDS UPON • NO OF ETAs REQUIRED • NO OF PUPEs REQUIRED – ETA REQUIREMENT DEPENDS UPON – TOTAL RF (RGF) CIRCUITS REQUIRED – TOTAL CCF CIRCUITS REQUIRED ICTSH CARD PROVIDES 8 RGF/CARD OR 8 CCF /CARD : IN SMA 1 & 2 UPTO 7 ICTSH OF RGF TYPE & 1 ICTSH OF CCF TYPE & IN OTHER SMAS 8 ICTSH OF RGF TYPE & 2 ICTSH OF CCF TYPE CAN BE INSTALLED. – PUPE REQUIREMENT DEPENDS UPON – TOTAL NO OF CCS 7 DATA LINKS TO BE TERMINATED ACHIL CARD PROVIDES FOR 16 CCS 7 DATA LINKS PER CARD ONE SMA HOLDS MAXIMUM 2 ACHIL CARD GIVING 1 PUPE ONE PUPE IS KEPT SPARE AS STANDBYE

DIMENSIONING OF OCB-283 • CALCULATION OF SMCs • • SMCs ARE CALCULATED BASED UPON THE TOTAL PROJECTED TRAFFIC OF THE EXCHANGE BASED UPON THE SPECIFIC TRAFFIC DATA OF THE AREA OF THE EXCHANGE & THE CONFIGURATION OF THE EXCHANGE REQUIRED: SMC’S ARE THE H/W STATION SUPPORTING THE S/W LOGICAL MACHINES ‘ML’ OF COMMON CONTROL FUNCTIONS OF EXCHANGE : - ML -> MR TR TX MQ GX & PC • • THESE LOGICAL MACHINES ‘ML’ ARE LOADED EITHER INDIVIDUALLY OR IN DEFINITE COMBINATIONS OF ‘ML’s IN SMC’S. THE SIZE OF THE FILES OF FOLLOWING MLs IS FIXED & THE FUNCTIONS OF THESE ‘ML’s ARE DUPLICATED ; (ONLY TWO OF EACH TYPE ) – • THE SIZE OF FILES OF FOLLOWING ML’s DEPENDS UPON THE TOTAL NUMBER OF SUBSCRIBERS & TOTAL CIRCUITS & THESE ML’S FUNCTIONS ARE ALSO ONLY DUPLICATED ; – • MLMQ, MLGX & MLPC MLTR & MLTX THE SIZE OF MLTX ALSO DEPENDS UPON TOTAL ERLANGE TRAFFIC TO BE HANDLED BECAUSE IT PROVIDES THE CHARGING REGISTERS WHICH HANDLE THE CALLS DURING THE CONVERSATION PHASE OF CALLS (1 REGISTER/CALL) – EACH MLTX HOLDS MACROPROGRAMME MEMORIES IN BLOCKS ; BLOCKS CAN BE MINIMUM 1 TO MAX. 4 – EACH BLOCK GIVES 2000 (OR 3000) CHARGING REGISTERS

DIMENSIONING OF OCB-283 • CALCULATION OF SMCs • • (CONTD ->) THE MLMR IS THE LOGICAL MACHINE WHICH IS THE OVERALL CONTROLLER OF THE CALL, HENCE – IT IS ACTIVE FOR THE LONGEST DURATION DURING PROCESSING , ANALYSIS & SELECTION & SETUP / RELEASE OF CALLS ; – THIS IS THE MACHINE WHICH IS REQUIRED TO WORK WITH EVERY EVENT OF THE SUBSCRIBERS/ CIRSUITS DURING SETUP & RELASE. MLMR’s CAN BE MINMUM 2 & MAXIMUM 7 , & EACH MLMR FUNCTION HANDLES UPTO 1016 SIMULTANEOUS CALLS INDEPENDENTLY & ITS MEMEORIES ARE NOT DUPLICATED AN MLMR CAN HAVE 1 TO 4 BLOCKS OF MACRO-PROGRAMME MEMORIES ; EACH BLOCK HOLDS 256 CALL HANDLING REGISTERS , HENCE MAXIMUM REGISTERS PER MLMR =1024 ; 2 REGISTERS PER BLOCK OF MACRO-PROGRAMME DO NOT HANDLE CALLS HENCE NET AVAILABLE REG. /BLOCK=254 MAXIMUM REGISTERS / MLMR=1016 AVAILABLE FOR HANDLING CALLS DEPENDING UPON THE TOTAL EXCHANGE’S PROJECTED TRAFFIC & BHCA ( CALLING RATE OF ALL SUBS. /CKTS) ; THE TOTAL NUMBER OF REGISTERS REQUIRED IS ESTIMATED. DEPENDING UPON NO. OF REGISTERS REQUIRED - THE ACTUAL MEMEORY SIZE OF MLMR IS OBTAINED & THEN THE NO. OF MLMR’s NEEDED IS DECIDED. MLMR IS HAVING THE LOWEST TRAFFIC HANDLING CAPACITY , HENCE IT IS THE MOST CRITICAL COMMON CONTROL FUNCTION IN EXCHANGE

• CALCULATION OF SMCs • • (CONTD ->) LOGICAL MACHINES ARE LOADABLE IN SMC’s IN COMBINATIONS SHOWN IN TABLE -1 & THIS GIVES TRAFFIC HANDLING CAPACITIY OF SMC’S FOR SUCH COMBINATIONS. DEPENDING UPON REQUIRED TRAFFIC HANDLING CAPACITY THE NUMBER OF MLMR’s & THE RIGHT COMBINATIONS OF ML’s IS TO BE SELECTED. MAXIMUM MEMEORY SIZE OF AN SMC IS = 36 MB THEREFORE IF IN THE EXISTING COMBINATIONS, IF THE SIZE OF ANY ‘ML’ INCREASES DUE TO INCREASE IN SIZE OF EXCHANGE EQPTS. , OR IN TRAFFIC , THEN ADDITIONAL SMC’s MAY BE REQUIRED TO DE-COMBINE THE ‘ ML’s. NORMALLY IN A MEDIUM SIZE EXCHANGE OF 10 K TO 20 K LINES & (PROPORTIONATE NO. OF CIRCUITS) THERE ARE 5 SMC’S WHICH HOLD THE ML’s AS FOLLOWS; – 2 SMC’s WITH ->MLMQ, MLTR, MLTX, MLGX, MLPC – 2 SMC’s EXCLUSIVELY FOR - > MLMR 1 & MLMR 2 – 1 SMC AS RESERVE OR STANDBYE AS THE NUMBER OF SUBSCRIBERS & CIRCUITS INCREASES OR AS THE TOTAL TRAFFIC INCREASES THERE WILL BE CORRESPONDING NEED OF INCREASE IN SIZE OF MLTR OR MLTX OR BOTH ; THEREFORE ACCORDINGLY, AFTER CALCULATING THE SIZE OF MEMEORIES OF THESE ML’s IT MAY BE REQUIRED TO SHIFT THESE ML’s IN EXCLUSIVE SMC’s OF THEIR OWN. FOR CALCULATING THE MLMR & MLTX REGISTERS THE EMPIRICAL FIGURES OF HANDLING & PROCESSING TIME etc. CAN BE TAKEN FROM THOSE CORRESPONDING TO MR & TX REGISTERS OF E-10 B FOR CALCULATING SIZE OF MLTR MEMEORY THE EXISTING SIZE OF MLTR

TABLE -1 : - TRAFFIC HANDLING CAPACITIES OF SMC’S COMBINATION OF ML’s OR FUNCTIONS IN SMC TRFC. HANDLING CAP. CALL ATT. /SECOND/SMC 1. MR, MQ, TR, TX, GX, PC 2. MQ, GX, TR, TX, PC 3. MQ, GX, PC 4. TR 5. TX 6. MR MIN. NO & MAX. NO OF SUCH SMCS 18 CA/S 50 CA/S 110 CA/S 36 CA/S 2 2 2 - 2 2 2 7 Standard Configurations of OCB-283 Exchanges CONFIGURATION OF COMBINATION OF EXCHANGE. MLS IN SMC COMPACT C SMALL P MEDIUM M NO OF SMC’S OF THIS TYPE TRAFFIC HANDL-ING CAP. OF EXCH. G 2 ONLY MR, TX, MQ, GX, PC 2 + 1 RES 36 CA/S OR 130000 CA/H TR, TX, MQ, GX, PC 2 100 CA/SOR 360000 CA/H MR LARGE MR, TX, MQ, GX, PC 2 ~3 +1 RES TR, MQ, GX, PC 2 MR TX 4 TO 7 2 5 CA/S OR 18000 CA/H 220 CA/S OR 800000 CA/H +1 RES

POWER DISTRIBUTION & CONSUMPTION IN OCB-283 EXCHANGE GETS POWER FROM -48 V TRIPPLED DC POWER SUPPLY ON CABLES PROVIDED UPTO SDE RACK INSTALLED IN ONE OF TH E EX EA CA RT HN H GE FUSES ROW FROM SDE THE DC SUPPLY IS DISTRIBUTED FROM RESPECTIVE FUSES TO CONCERNED RACKS : TOTAL CURRENT CONSUMTION OF A TYPICAL OCB 283 EXCHANGE OF 20 K LINES IS APPROXIMATELY -48 V = 140 A CURRENT REQUIREMENT OF VARIOUS STATIONS IS GIVEN BELOW CURRENT CONSUMTION INCREASES WITH INCREASE IN SUBSCRIBER & TRAFFIC 0 V STATION CURRENT AT 5 V AT 48 V SMC 32 A 4 A SMA 24 A 3 A SMX SMT 1 G 34 A 4. 5 A SMT 2 G SMM CSN B CSN E

CHART OF INSTALLATION ACTIVITIES OF A MEDIUM SIZE OCB-283 EXCHNAGE IN DAYS

ISDN : THE CONCEPT OF MODERN COMMUNICATION

YOR FUTURISTIC HOME IN INDIAN VILLAGE INTERACTIVE SATTELLITE & CABLE TV SERVICES WILL BE CONTROLLED BY HOME COMPUTER OVEN TV YOU CAN ORDER YOUR CURTAINS TO BE OPENED OR CLOSED DEPENDING UPON WHEATHER YOU CAN ORDER YOUR AC TO ON/OFF HOME COMPUTER/ COMM. SYSTEM AC WASHING MACHINE YOUR VIDEO CAMERA ON THE FRONT DOOR CAN TRANSMIT TEH IMAGE OF PERSON STANDING ON YOUR DOOR WHEN YOU ARE AWAY ON VACATION IN SOUTH AMERICA CAMERA YOUR COMPUTER FROM CARPHONE YOUR WIFE WILL TALK TO CAN ORDE R OVEN TO START ELECTRICITY AUTHORITIES TO DECIDE WHEN TO PUT ON THE WASHING MACHINES ISDN : CONCEPT OF FUTUREISTIC HOME & COMMUNICATION YOR ARE HERE IN SOUTH AMERICA ON VACATIONS AT BEACH WITH YOUR LAPTOP MOBILE COMPUTER /COMMUNICATOR