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
– R2 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 4
CSN 1
CSN 5
PS 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
PS 1
COC:- COMMON SIGNALING
CHANNEL
CIC:- VOICE CHANNELS
PS 3
RSU
EXCH 1
PS=2000
SP1
PS 4
CSN 4
CSN 5
EXCH 2
PS=3000
SP2
COC0
COC1
COC:- COMMON SIGNALING
CHANNEL
PS 5
PS 63
CSN 63
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
OCB-283
OCB-283 FUNCTIONAL
DIAGRAM
CSNL
LR (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
LR
SMT
LR
COM
PU
PE
ETA
URM
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
MR :
TR :
MQ :
TX :
GX :
PC :
NATURE OF JOB
Multiregister
Translator
Marker
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 (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
LR
SMT
LR
COM
PU
PE
ETA
URM
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 (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
LR
SMT
LR
COM
PU
PE
ETA
URM
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 (HDB3) 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
CCS7 PROTOCOL
ABOVE FUNCTIONS ARE CONNECTED TO SMX
BY LR LINKS FOR SWITCHING
OCB-283 FUNCTIONAL
DIAGRAM
CSNL
LR (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
CONTROL
LR
SMT
COM
SUBSYSTEM
URM
LR
PU
PE
ETA
CKTS
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,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.
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 (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
LR
LR
O&M
SMT
URM
SUBSYSTEM
CKTS
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 (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
COMMUNICATION
MULTIPLEX
LR
SMT
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 (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
LR
SMT
LR
COM
PU
PE
ETA
URM
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 LINKS
LR (4MB /
CSND
S)
2 MB/S
PCM
SMX
DT
BT
MCX
LR
SMT
LR
COM
PU
PE
ETA
URM
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
UR
M
SC
SC
VC
VC
CSNL
ETA
SC
COM
CKT
S
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
SC
MCX
VC
UR
M
CSNL
VC
ETA
COM
CKT
S
MAS
TX
SC
‘B’
TR
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
SC
MCX
VC
UR
M
CSNL
VC
ETA
COM
CKT
S
MAS
TX
SC
‘B’
TR
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
SC
MCX
VC
UR
M
CSNL
VC
ETA
COM
CKT
S
MAS
TX
SC
‘B’
TR
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
SC
MCX
VC
UR
M
CSNL
VC
ETA
COM
CKT
S
MAS
TX
SC
‘B’
TR
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
SC
MCX
VC
UR
M
CSNL
VC
ETA
COM
CKT
S
MAS
TX
SC
‘B’
TR
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
SC
MCX
VC
UR
M
DT
COM
CKT
S
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
SC
MCX
VC
UR
M
COM
CKT
S
MAS
TX
CSNL
SC
‘B’
TR
MR
MQ
RGF
SC
SC
GX
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
SC
MCX
VC
UR
M
COM
CKT
S
MAS
TX
CSNL
SC
‘B’
TR
MR
MQ
RGF
SC
SC
GX
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
SC
MCX
VC
UR
M
COM
CKT
S
MAS
TX
CSNL
SC
‘B’
TR
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’
‘A’
CSNL
A
CSND
SC
MCX
B
VC
UR
M
COM
CKT
S
MAS
TX
CSNL
SC
TR
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
SC
MCX
VC-B
VC-A
UR
M
COM
CKT
S
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
SC
MCX
VC-B
VC-A
UR
M
COM
CKT
S
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
SC
MCX
VC-B
VC-A
UR
M
COM
CKT
S
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
OCB-283
HARDWARE ARCHITECTURE OF OCB-283
16 LR’S
CSNL
STS
1x3
MCX
PCM
CSND
2TO 16
SMT
(1 TO 64)x2
2 TO 4
SMA
2 TO 64
CSED
CIRCUITS
LR
SMX
(1 TO 8)x2
LR
MAS (1 TO 4) A&B
SMC
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,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
• 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
SMC
MIS
SMM
CONTROL
TERMINAL
HARDWARE STATIONS OF OCB-283
•
CSN: SUBS. ACCESS UNIT
CSNL
CSND
MCX
STS
PCM
SMX
SMT
CSED
SMA
CIRCUITS
MAS
SMC
VDU
TTY
OPERATION &MAINTENANCE
TERMINALS
LINK TO TMN
SMC
SMC
MIS
SMM
CONTROL
TERMINAL
HARDWARE STATIONS OF OCB-283
•
•
CSN :SUBS.ACC UNIT
SMC :MAIN CONTROL
STATION
CSNL
CSND
MCX
STS
PCM
SMX
SMT
CSED
SMA
CIRCUITS
MAS
SMC
VDU
TTY
OPERATION &MAINTENANCE
TERMINALS
LINK TO TMN
SMC
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
STS
PCM
SMX
SMT
CSED
SMA
CIRCUITS
MAS
SMC
VDU
TTY
OPERATION &MAINTENANCE
TERMINALS
LINK TO TMN
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
SMX :MATRIX CONTROL
STATION
CSNL
CSND
MCX
STS
PCM
SMX
SMT
CSED
SMA
CIRCUITS
MAS
SMC
VDU
TTY
OPERATION &MAINTENANCE
TERMINALS
LINK TO TMN
SMC
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
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
STS
PCM
SMX
SMT
CSED
SMA
CIRCUITS
MAS
SMC
VDU
TTY
OPERATION &MAINTENANCE
TERMINALS
LINK TO TMN
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
LINK TO TMN
MCX
STS
SMX
MAS
SMC
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
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
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
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,TR,TX,MQ,
GX &PC SOFTWARE
CSNL
CSND
MCX
STS
PCM
SMT
SMX
CSED
SMA
M IS
CIRCUITS
SMC
SMA CAN BE LOADED
WITH ETA,PUPE
SOFTWARE
PERFORMANCE DATA:5 CA/S OR
18000 BHCA
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,TR,TX,MQ,
GX &PC SOFTWARE
CSNL
CSND
STS
MCX
PCM
SMT
SMX
CSED
SMA
CIRCUITS
MAS
SMC
SMA CAN BE LOADED
WITH ETA,PUPE
SOFTWARE
PERFORMANCE DATA:36 CA/S OR
1,30000 BHCA
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
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
STS
PCM
SMX
SMT
CSED
SMA
CIRCUITS
MAS
SMC
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
: 1 OR MORE
CSNL
CSND
MCX
STS
PCM
SMX
SMT
CSED
SMA
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
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
TS2047
X
TS 0
X-->Y
UNIDIRECTIONAL
INCOMING LINK CARRYING 2048
TIME SLOTS OF 64 INTERNAL
LINK EACH OF 32 TIME SLOTS
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
64x32-1
=2047
Y
TS2047
OUT LET
X
X
0
1
Controlled Write
X
TS0
OUTGOING LINK CARRYING 2048
TIME SLOTS OF 64 INTERNAL
LINK EACH OF 32 TIME SLOTS
Y
CONTROL MEMORY
Sequential Read
Y
X
64x32-1
=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
GLR (A & B)
1
0
1
2
3
0 S
1 M
2 X
1
SMX 1
B
A
5
6
7
8
MAS 2 (A & B)
SMA SMA SMA
1
2
3
MAS 1 (A & B)
SMC1
SMC2
SMC3
SMC4
SMC5
MIS A & B
SMMA
OCB-283
OCB-283
DIAGRAM
EXCHANGE
SMMB
TOKEN RINGS
MIS MAS 1 & MAS 2
CSNL
0
1
SMT
0
1
2
3
GLR( A & B)
GLR (A & B)
3
4
0 S
1 M
2 X
1
SMX 1
B
A
5
6
7
8
MAS 2 (A & B)
SMA SMA SMA
1
2
3
SPEECH PATH IN OCB-283
SMC1
SMC2
SMC3
SMC4
SMC5
MIS A & B
SMMB
SMMA
OCB-283
EXCHANGE
TOKEN RINGS
MIS MAS 1 & MAS 2
NETWORK LINK LR’s
(GROUP OF LR’s)
SUBSCRIBER.
ACCESS
GLR 0B
CSNL
GLR 1B
SMX
1 GLR =8 LRs
GLR 0A
GLR 1A
SMX
8
B
SMT
2
1 B
B
PCM
8
A
PCM
CIRCUIT
CONNECTION
EQPT.
AUXILIARY
SMA
EQPT
GLR OB
1
A
2
A
SWITCHING
MATRIX
GLR OA
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
SUBSCRIBER ACCESS UNITS
CSNL OR CSND RACKS
BASIC RACK
T
C
R
M
T
TOND
TOND
UCX0 UCX1
GTA
T
C
R
M
T
CNL OR ICNE
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
EXTENSION RACKS
SUBSCRIBER ACCESS UNITS
CSNL OR CSND RACKS
T
C
R
M
T
TOND
TOND
UCX0 UCX1
T
C
R
M
T
TOND
TOND
UCX0 UCX1
GTA
GTA
CNL OR ICNE
CNL OR ICNE
T
C
R
M
T
T
C
R
M
T
T
C
R
M
T
CNL OR ICNE
CNL OR ICNE
CNL OR ICNE
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
T
C
R
M
T
T
C
R
M
T
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
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
TOND
INTERFACE WITH
EXCHANGE
TBALAM
T
C
R
M
T
TBUCN
CNL OR ICNE
T
C
R
M
T
TBABM2
CNL OR ICNE
T
C
R
M
T
TBABM2
UCX0 UCX1
GTA
CNL OR ICNE
T
C
R
M
T
TBABM2
CNL OR ICNE
T
C
R
M
T
TBABM2
GLR0 &1(A)
AUX. EQPT
GLR 0&1(B)
CONTROL
LOGICS
T
C
R
M
T
TOND
TOND
UCX0 UCX1
GTA
CNL OR ICNE
CNL OR ICNE
PCM
CNE
T
C
R
M
T
T
C
R
M
T
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CSN BASIC RACK
FOR CSNL
SUBS. CONNECTION
SHELFS
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
TOND 80 (0)
~ 40 V
IN CASE OF CSNL
IN CASE OF CSNL
TCILR
TCBTL
T
C
C
O
B
TOND 80 (1)
~40 V
T
C
C
S
T
C
C
S
T
P
U
C
B
T
M
U
C
2
M
T
M
Q
R
T
R
C
X
T
R
C
X
T
R
C
X T
S
U
C
T
R
C
X
T
R
C
X
T
R
C
X
T
T
R
S
13 12 9 8
T
T
R
S
15 14 11 10
7 6
T
T
R
S
1
T
T
R
S
3
T
M
Q
R
T
C
C
S
T
H
L
R
T
M
U
C
2
M
T
P
U
C
B
T
C
C
S
5
4
T
H
L
R
T
T
R
S
0
T
T
R
S
2
T
R
F
8
B
*
UCX0
UCX1
T
B
T
D
T
B
T
D
T
C
R
M
T
T
C
R
M
T
B A
T
R
F
8
B
*
T
F
I
L
M
B
*
GTA
T
P
O
S
T
M
L
A
B
T
S
U
R
V
2
T
S
U
R
V
2
T
S
U
R
V
2
T
5
V
1
7
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
AUX. EQPT
T
C
R
M
T
TOND
TOND
UCX0 UCX1
GTA
CNL OR ICNE
CNL OR ICNE
PCM
CNE
T
C
R
M
T
T
C
R
M
T
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CNL OR ICNE
T
C
R
M
T
CSN BASIC RACK
FOR CSND
SUBS. CONNECTION
SHELFS
1 GLR= 8 LRS
TWO GLR/CSN
CSN EXTENSION
RACK
LOCALSUBSS.
CONCENTRATOR
CNL OR ICNE
REMOTE
SUBS.
CONN.
CNE
CNL OR ICNE
CNL OR ICNE
REMOTESUBSS.
CONCENTRATOR
INTERFACE
PCM
CNL OR ICNE
CNL OR ICNE
EXPANDED VIEW OF
C N L SHELF
CNL OR ICNE
CNL OR ICNE
CNL OR ICNE
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
15T
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 SMX1 TO SMX8
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
LR0
LR255
.T.
1
LR0
LR255
2
3
4
COM
5
6
7
LR 2047
8
LR 2047
256x256 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
64x64
0~63 O/L
256x256
SQUARE
MATRIX
EXPANDED
VIEW
64 x64
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
TS2047
X
TS 0
INLET
W
0
1
SPEECH OF X
R
C
O
N
T
R
O
L
U
N
I
T
SWITCHING FROM Y-X
I/C LINK CARRYING 2048
TIME SLOTS OF 64 LRE LINK
EACH OF 32 TIME SLOTS
SPEECH
BUFFER MEMORY
0
1
R
Y
TS0
0
1
CONTROL MEMORY
X
I/C LINK CARRYING 2048
TIME SLOTS OF 64 LRE LINK
EACH OF 32 TIME SLOTS
TS 0
SPEECH OF Y
X
TS2047
W
Y
INLET
W
64x32-1
=2047
OUT LET
R
TS2047
y
64x32-1
=2047
C
O
N
T
R
O
L
U
N
I
T
SPEECH
BUFFER MEMORY
Y
64x32-1
=2047
OUT LET
TS2047
X
TS0
0
1
W
CONTROL MEMORY
R
Y
X
64x32-1
=2047
SWITCH OF Y
SWITCH OF X
BASIC 64x64 SQUARE MATRIX
CORRESPONDING TO LRE OF X
BASIC 64x64 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 1
SMX 3
SMX5
SMX 7
SMX 2
SMX 4
SMX6
SMX 8
SMX 1 (EX)
SMX2 (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 CCS7
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
SMC
SMA
SHELF
SMC
SMA
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 1G CAN CATER TO
32 PCMS
– SMT 2G 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 :- ICMPN2 ->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
SMT RACK
SMT
SMT
PCM
PCM
DDF
CONTROL STATIONS OF OCB-283
PCMS
CSNL
0
1
SMT
0
1
2
3
SMC1
GLR( A & B)
GLR (A & B)
3
4
0 S
1 M
MAIN
MULTI PROCESSOR
CONTROL
STATIONS :SMC
SMC2
SMC3
SMC4
SMC5
MIS A & B
SMMA
OCB-283
OCB-283
DIAGRAM
EXCHANGE
SMMB
TOKEN RINGS
MIS MAS 1 & MAS 2
OCB-283 BLOCK DIAGRAM
MAIN CONTROL STATION: SMC
SMC IS THE HARDWARE
STATION FOR LOADING
COMMON CONTROL
FUNCTIONS MR,TR,MQ
TX,GX, & PC
SMC
SMC
IN SOFTWARE FORM
SMC
IN PHYSICAL FORM ONE SMC
OCCUPIES ONLY ONE SHELF OF
A RACK
SMA
SMA
MAINTENANCE STATIONS OF OCB-283
PCMS
CSNL
0
1
SMT
0
1
2
3
SMC1
GLR( A & B)
GLR (A & B)
3
4
0 S
1 M
2 X
1
SMX 1
B
A
5
6
7
8
MAS 2 (A & B)
SMC2
SMA SMA SMA
1
2
3
MAINTENANCE
MAS 1
STATIONS
SMM A&B
SMC
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 4TH 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
0
1
2
3
PCMS
GLR( A & B)
GLR (A & B)
3
4
0 S
1 M
2 X
5
1
6 SMX 1
B
A
7
8
MAS 2 (A & B)
MAS
SMA SMA SMA
1
2
3
MAS 1 (A & B)
SMC1
SMC2
SMC3
SMC4
SMC5
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:-COC0= (TS16-LR0 )& COC1=(TS16-LR1)
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
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)
SMC1
@ AM=SMM;
OR SMMA; OR SMMB;
SMC2
SMC3
SMC4
MIS A & B
SMMA
OCB-283
DIAGRAM
SMMB
@ AMXIL:
@ AMX=MIS;
OR AMX=MAS;
OR AMX= MISA
OR AMX=MISB
SMC5
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
AFGRX=SMX-GLR
AFGRU=n-0
AFGRX=1-2
AFGRU=n-1
AFGRX=1-3
AFGRX=1-15
AFUR=n
AFGRX=1-29
AFGRA=SMA-GLR
SMAn
AFGRX=2-8
AFGRX=2-11
AFGRA=n-0
AM=SMAn
0
1
2
3
SMX1 ( A &B)
31
SMX2 ( A &B)
AFGRX=3-3
AFGRT= SMT-GLR
SMX3 ( A &B)
AFGRT=n-0
PCM
AFGRT=n-1
SMTn
AFGRT=n-2
AM=SMTn AFGRT=n-3
SMX8 ( 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
7
8 SPEECH BITS
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 6k 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
2000mm
DBM
CB
CC
SMC
SMC
SMC
STS
SMC
SMC
SMX1
SMT-A
SMC
SMC
SMX2
SMT-B
AL ANN PER
SMA
SMC
SMX E
SMT-A
SMMB
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
SMC
UCN
SMT-A
SMA
SMT-A
CNL0
CNL
4
SMT-B
SMA
SMT-B
CNL1
CNL6
SMA
SMA
SMT-A
CNL2
CNL7
SMA
SMA
SMT-B
CNL3
CNL8
1SMC+ 2 SMT’s
UCN+ 4 CNL(ICNE)
5 CNL(ICNE)
1 SMC+1 SMT
+2 SMA
1SMC+ 4 SMA
CNL5
LAY OUT OF AN OCB-283
SWITCH ROOM
EXAMPLE :-BOMBAY SION TELEPHONE EXCHANGE
SWITCH ROOM
ALL DIMENSIONS IN MM
1500
TR07
UE1
CSN
021
CSN
020
800
690
TR06
DBM
CA
UC1
SDE1
CB1
XA1A
XA2A
CSN
011
CSN
010
UD1
UC2
XA1B
XA2B
CSN
051
CSN
050
CSN
041
6
5
4
950
TR05
CSN
061
TR04
16
15
14
13
12
11
10
9
VDU
OPERATION ROOM
8
CSN
060
7
VDU
VDU
CSN
040
3
VDU
CSN
031
2
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 SMT
SMA
CSN 1~63
1TO 63 1 UR PER CSN
223 TO 64
8 MODULE OR UR NO PER SMT
FOR SMT 1G &
32 MOD. OR UR PER SMT-2G
MLETA/
256 TO 224
MLPUPE
1 UR NO PER SMA
UR NUMBERING SCALE
1234
RANGE OF UR NO.S
UR #
63 64
223 224
SMT20
SMT 1
SMA32
256
SMA1
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 1G
32
4
SMT 2G
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
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 RCMT0 TO RCMT7 )
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 CCS7 DATA LINKS TO BE TERMINATED
ACHIL CARD PROVIDES FOR 16 CCS7 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 - > MLMR1 & MLMR2
– 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-10B
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
110 CA/S
110 CA/S
36 CA/S
2
2
2
2
2
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
LARGE
G
NO OF SMC’S
OF THIS TYPE
TRAFFIC HANDL-ING CAP. OF EXCH.
MR,TR,TX,MQ,GX,PC
2 ONLY
5 CA/S OR 18000 CA/H
MR,TR,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
2 ~3 +1 RES
TR,MQ,GX,PC
2
MR
TX
4 TO 7
2
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
FUSES
ROW
FROM SDE THE DC SUPPLY IS DISTRIBUTED FROM
RESPECTIVE FUSES TO CONCERNED RACKS :
TOTAL CURRENT CONSUMTION OF A TYPICAL OCB283 EXCHANGE OF 20 K LINES IS APPROXIMATELY
-48V
= 140 A
CURRENT REQUIREMENT OF VARIOUS STATIONS IS
GIVEN BELOW
CURRENT CONSUMTION INCREASES WITH INCREASE
IN SUBSCRIBER & TRAFFIC
0V
STATION
CURRENT AT 5 V
AT 48V
SMC
32 A
4A
SMA
24 A
3A
SMX
SMT1G
34 A
4.5 A
SMT2G
SMM
CSN B
CSN E
SDE RACK
CHART OF INSTALLATION ACTIVITIES OF A MEDIUM SIZE OCB-283 EXCHNAGE
IN DAYS
0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4
ACTIVITY
DAYS
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
MARKING
TILE CUTTING
BASE PLATE FIXING
RACK FIXING AND ALIGNMENT
FIXING DCDB, ACDB, IRP, ALARM BOX
LAYING DCDB TO SDE POWER CABLE
LAYING O/P CABLE TO DCDB POWER CABLE
LAYING SDE TO RACK ENERGY CABLES
INTER RACKS AND INTER CSNL CABLING
SMM TO IRP CABLES
ACDB TO PERIPHERALS POWER CABLES
IRP TO PERIPHERALS SIGNAL CABLES
PCM CABLE LAYING AND LACING
PCM CABLE PREPARATION (BOTH SIDES)
PCM CABLE TERMINATION (BOTH SIDES)
BUZZING PCM CABLE
ALARM CABLE LAYING AND TERMINATION
SUBS CABLE LAYING AND LACING
SUBS CABLE PREPARATION (BOTH SIDES)
SUBS CABLE TERMINATION (BOTH SIDES)
SUBS CABLE BUZZING AND FAULT CLEARING
A-B WIRE CHECK AND FAULT CLEARANCE
LOCAVAR
ALARM TESTING
SMM TEST
JUNCTION DATA VERIFICATION AND TEST
SUBSCRIBER DATA TEST
JUNCTION THROUGH TESTS
FSQ TEST
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
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
HOME COMPUTER/
COMM. SYSTEM
AC
WASHING
MACHINE
CAMERA
YOUR COMPUTER
FROM CARPHONE YOUR WIFE
WILL TALK TO
ELECTRICITY AUTHORITIES CAN ORDE R OVEN TO START
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