a overview of a exchange
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What is exchange?Exchange is define as a simply switch by virtue of
which we are able to communicate from one point to
another.Explanation about Telecommunication System :Telecommunication system requires electrical energy
for conversion of speech signals to electrical signals,
exchange switching, and transmission over a medium.
What are the components of communication system?Source converter media destination
Different components of communication system in detail:
SOURCE: it is a originating point at whichcommunication system in detail.
For example: when two person talking with each other
from different places, then they are talk with each other
through a system called telephone which we say A
source.
CONVERTER: converter is a component ofcommunication system that convert voice signal to
electrical signal.
For example :when a person is talking with another personthrough a source called telephone than his voice is not
reached to another person. A condition occur at which
voice signal is converted to electrical signal is called
converter.
MEDIA: media is a component of communicationsystem that is applied to convert the voice signal toelectrical signal. for example OFC{optical fiber cable}.
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CONVERTER: at this stage reconversion takesplace. it is a component of communication system that
convert electrical signal to voice signal. for example, when
two man talking with each other through telephone thanone man can hear the voice of other man through
converter.
DESTINATION: Destination is simply definedwhere system terminate. it is the point where we receive
the signal from a source called telephone on the other hand
we say it receiver called destination.POWER SUPPLY: it should be noted that in exchange
there must be 24 hours power supply.
In telecom system,dc power supply is only used.
-48v to -55v{dc}
it should be noted that there must be 24 hours power
supply or power supply should not be cut off for a minute.if this situation is ignore than there must be a great
damage in exchange. as a result exchange can destroy.
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Parts of exchangeSwitch roomMDF{main distribution frame}
FRS{fault record system}
Power plantE/A room {engine and alternator
room}
OMC{operation and
maintenance center}Cash counter
Mobile section
TransmissionFRS{fault record system}
AC plant room
Customer care center
TRA branch{telephone revenueaccount}3
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Supply system of exchange
It is clear that in telecom system only DC power supplyis used because of the following reasons:
1.harmonics of AC may effect the speech signals.
2.Relays used in telecom system are more sensitive to
DC than AC.
3.transistors and ICs etc,being unidirectional
devices, the use of DC has become necessary.
4.arranging standby source to AC is difficult compare
to DC for which secondary cells can be used as S/B
source.
5.Not hazardous to human life.
-In the exchange it should be noted that uninterruptedpower supply is used. Simply its mean that in the
exchange 24 hours power supply is required that means
the power supply should not be cut off for a minute. for
this we use another source called secondary or standby
source which comes in work when main source destroy.-For any uninterrupted power supply system twosources are required. that are main source or
secondary source {or standby source}.
What is main source?-Main source or normal source is one which supplies
power to the load round .Normal source is the source
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which is always in work. For example, in the Engine
and alternator room there are two ht panel, two
transformer or two generator. from them one is called
main source which is always in work.
What is standby source?Secondary or standby source is one which supplies
power to the load only during the absence of power
from normal source. For example in the E/A Room there
are two ht panel, two transformers or two generator.
each source is two. from them one is called main source
which is always in work or the other is called standbysource which play a role in the system when main
source is destroy.
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Sub-station room
Discussion about HT PANEL:In the HT panel there are present a relay or a circuit
breaker. There are present two HT panel one is called
main HT panel and other is called standby HT panel.
Standby HT panel works in the absence of main source.
It should be noted that PSEB transfer 11K supply to HTpanel.
Transfer of 11K 3 phase AC supply to the transformer:
Now 11K 3 phase AC supply transfers to the
transformer where it converted into 420K,3 phase ACsupply. there are also present two transformers which
play a role in the similar manner that is the HT panel.
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Control panel:
Now the transformers are connected to the control panel
where all the switches to control the transformer and
generator are located.
GENERATOR: Generator is also connected tocontrol panel .there are two generators which are
connected to the control panel. From them one is called
main generator or other is called standby generator.
Conversion of AC voltage to DCvoltage:
Rectifier is used to convert AC voltage to DC voltage.
It is simply defined as to arrive the strength of weak
signal.
OMC ROOM{operation and maintenance center}All type of controlling is done by OMC room, which
consist of a computer as a terminal Interface. OMC
room environment temperature between 20 degree to 24
degree C.
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OCB exchange working under Unix operating system,
for communication between human and exchange
through PC using windows NT environment. The
terminals control all the operation through commands.
PC: With the help of PC we check all the status ofexchange hardware. It show the alarm on terminal , if
any critical problem in the exchange .All the facility,
provided to the subscribers through this terminal .The
exchange data can also be analysis by DBMS packageslike FoxPro and visual FoxPro. For official work, on
this pc terminals used the software package MS office
2000{ MS-word,MS-excel,MS-access}.
On the exchange media OFC{optical fiber cable}PCM can be create, delete or modify and controlled
by this terminals.
From OMC room Now New communication
technology like WLL{wireless local loop}are control
from the pc terminals. The version of WLL is the bestthat is CDMA{code division multiple access}.WLL
has many advantages in landline, It is very successful
technology.
In the exchange media 4 terminals attached with
exchange .these four terminals are interconnectedthrough exchange. these four terminals are:
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1.CV1
2.CV2
3.CV3
4.CV4
CV stands for visual control
These four terminals are interconnected through
exchange if any terminals has been linked down, we canup the terminals with the help of other terminals.
Number of terminals attached to the exchange is
depends upon the How many number of user can be
communicate with exchange.
PC terminals increase or decrease at any time:
Parts of PC:
1.CPU
2.VDU
3.keyboard
4.mouse
5.CPU contains the following parts:
HDD,FDD,CD-ROM, Tape derive etc.
For produced the hard copy, used a DOT MATRIX
24 PIN and 132 columns printers. These printer are
direct attached with PC terminals Individual printer
attached the individual PC Terminals. One laser
printer are used only for print the official Documents.9
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INTERNET: In OMC ROOM on PC terminalsaccess the internet using a modem and telephone line.
Modem used for modulation and demodulation of
data. Now ISDN {integrated service digitalnetwork}technology used for high rate transferred of
Data.
BATTERY AND POWER PLANTThe power plant is usually referred asheart of
telecom system.
1.signaling 2.switching 3.transmission
----three basic requirements for power
supply:a. reliability of the components
b. free from noise and humidity
c. sensitivity
Source of Power: 1.AC mains 220V singlephase or 440V 3 phase 50 Hz.
2.S/B{standby}-S/B power supply like generator sets.
Types of power plant:
1.low size:5-12amp
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2.medium:25-50amp
3.Large size:100-180amp
Parts of power plant:1.Battery charger2.Float rectifier3.Switching cubical
4.Invertor
Battery charger +Filter circuit works as float rectifier.
Three way to use Battery:
1.charge discharge system
2.Standby battery system
3.Float battery system
-In OCB Exchange two battery SETA and SETB are
used having the capacity of one set is 2000 amp/h.
One set of battery consist of 24 cells. The Voltage ofone cell is 2.15 to 2.20.
In OCB exchange used a VRLA Battery{value
regulated lead acid}Battery used for maintenance
free.
Battery charge range from 44V to 65V.The maximum
volt in one cell 2.56V
WORKING: Exchange required a load51.5+_0.5
Hence exchange required-46V to 52V for working.
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CAPACITY OF BATTERY: capacity ofbattery:
Measure as Amp-hours.
Factors effecting the capacity of battery:1.Quantity and Condition of active material.
2.Design of Plates
3.Temperature of electrolyte.
4.Density and specific gravity of electrolyte.
5.The case at which the electrolyte can circulate
around the palter.6.The rate of discharge: Ampere Hour efficiency:
A/H efficiency= i*t/I*T*100
i=rate of discharge in Ampere
I=rate of charge in ampere
t=time of discharge in hours
T=time of charge in hours-Specific gravity of electrolyte decrease due to
discharge and vice versa capacity of battery
increase in temp in electrolyte. increase the capacity
of battery but decrease the battery life.
-Initial charge of battery: Requirement ofcharge of battery1.Building work
2.h2so4{distilled}
3.Battery charger
4.wiring
5.Measuring instrumentsSpecific gravity required 1840
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-Battery charge from 44 to 65v
The charge with in 24 hours during filling the
electrolyte in battery.
-Purpose of Initial charge:1.To soften the plates2.To convert pbso4 into heating active material.
Maintenance of battery:1.Avoid overcharging of battery
2.Avoid undercharging of battery
3.Avoid high acid temp4.Avoid high acid density
5.Proper maintenance.
Factors effecting the battery:1.High acid temp
2.High acid density
3.Overcharging
4.Undercharging
5.Bad maintenance
Routine Test/check of battery1. Pilot cell reading-daily
2. All cell reading-weekly
3. check of electrolyte-weekly
4. number of plates, Nuts & bolts-half yearly
Life of battery-10 to 15 yearsAfter the life of battery life is 15 years
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After the life of battery 75% to 80%capacity
it mean battery are dead.
OCB-283 system
Functional architecture: The alcatelE10 system is located at the heart of the
telecommunication networks concened. It is
made up of three independent functional
units: the subscriber access system
-connection and control
-operation and maintenance.
TIME BASE{BT}:The BT ensures timedistance for LR and PCM to provide the
synchronization, and also for working out the
exchange clock. Time distribution is tripled.
Time generation can be either autonomous or
slaved to an external rhythm with a view tosynchronize the system with the network.
SWITCHING MATRIX{SMX}:The SMX is a square connection matrix
matrix with a single time stage T ,duplicated
in full, which enables up to 2048 matrix
links{LR}to be connected. A matrix link LR14
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is an internal PCM, with 16 bits per
channel{32 channels}.
PCM controller {URM}The URM provides the interface betweenexternal PCMs and the OCB 283.These PCM
come from either:-A remote subscriber digital
access unit{CSN}or from a remote electronic
satellite concentrator{CSE}.
-Another switching center, on channel-associated signaling or CCITT NO :7.
-The digital recorded announcement
equipment auxiliary equipment
manager{ETA}
The ETA Supports:-the tone generator-The frequency receiving and
generation{RGF}devices,
-conference circuits{CCF},
-The exchange clock
CCS7 protocol handler{PUPE}andCCS7 controller{PC}:CCITT no.7 protocolprocessing
For connecting of 64 K bits signaling channels, semi-
permanent connections are established via the
connection matrix, to the PUPE which processes
the CCITT NO.7 protocol.
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CALL HANDLER{MR}:The MR is theresponsible for the establishment and breaking off
of communications-The call handler takes the
decisions necessary for processing ofcommunications in terms of the signalling received
,after consolations of the subscriber and analysis
database manager {TR}if necessary. The call
handler processing new calls and hanging-up
operations, releases equipment, commands
switching on and switching off etc. In addition, thecall handler is responsible for different
management tasks{control of tests of circuit, study
observations.
Subscriber and analysis database manager
{TR}{TRANSLATOR}.The TR functionscarries out management of the analysis, subscribers
and circuit group database.
The TR supplies the call handler ,on request from it,
with subscribers circuits characteristics necessary
for establishing and breaking off communications,
The TR also ensures match between the dialing
received and the addresses of the circuit groups or
subscribers{Pre-analyses, translations functions.
CALL CHARGING AND TRAFFIC
MEASUREMENT{TX}:The TX function carries out charging for
communications.16
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TX is responsible for:
-calculating the amount to be charged for each
communication,
-keeping the charge account of each subscriber served
by the switching center,
-supplying the necessary information for drawing up
detailed billing, online to the OM.
IN addition, TX carries out tasks of observation of
circuits and subscribers observations.
MATRIX SYSTEM HANDLER{GX}The GX function is responsible for processing and for
defence of connections on receipt of:
-request for connection or disconnection coming from
call handler{MR}or message distributor
functions{MQ},
-connection faults signaled by the matrix switchcontroller function{COM}.
MESSAGE DISTRIBUTOR{MQ}The MQ function is responsible for distribution and
formatting of certain internal messages.but, above
all ,it carries out.
-supervision of semi-permanent connections{data
link},
-transmission of messages between the
communication multiplexes{gateway function}
COMMUNICATION MULTIPLEX:
One to five communication multiplexes are used totransmit message from one station two another.
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OPERATION AND MAINTENANCEFUNCTION{OM}:The functions of theoperation and maintenance subsystem are carried
out by the operation and maintenancesoftware{OM}.
The operating authority accesses all hardware and
software equipment of the Alactel 1000 E10 system
via computer terminals belonging to the operation
and maintenance subsystem. Consoles, Magnetic
media, intelligent terminal. these functions can begrouped into 2 categories:-
-operation of the telephone application
-Operation and maintenance of the system
In addition ,the operation and maintenance subsystem
carries out:
-loading of softwares and data for connection andcommand and for the subscriber digital access units,-
temporary backup of detailed billing information,
-centralization of alarm data coming from connection
and control station ,via alarm rings,
-Finally the operation and maintenance subsystem
permits two way communication with operation andmaintenance networks, at regional or national
level{TMN}
SMC: Main control station
SMA: auxiliary equipment control station.
SMT: Trunk control stationSMX: matrix control system
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SMM: maintenance station
STS: Synchronisation and time base station.
TRANSMISSION: media of transmission:1. MARR: multi-access radio relay
2. Digital MUX{multiplexing}
3. Digital UHF{ultra higher frequency}
4. Digital M/W{microwave}
5. Digital coaxial6. OFC
7. Satellite transmission
TYPES OF MARR SYSTEM:
1. 2/15 MARR SYSTEM
In the circuit 2 channels and 15 subscriber.
2. 4/30 system
In this system 4 channels and 30 subscriber extend
up to 36.
3. 8/60 8 channels and 60 subscriber extend up to 72.
MDF: {main distribution frame}:MDF combinethe switching equipment and external plant.
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All the line with in the exchange in are strike in
numerical order .Two conductor Jumper wire is used in
MDF{white and red}
Facilities provided by MDF:
1.permanently terminate of external point
2.Cross conducting External circuit to the
appropriate.
3.A mean path interconnection. Point for faultlocating.
:MDF one side is exchange side and other is line side.
ADVANTAGE OF MDF:1.Flexibility
2.Testing point
3.Protection from over voltage and current.
-For the protection of exchange two types fuses are
used:
1.DAF: Delay action fuse for protectionagainst higher current.2. GDT: Gas discharge tube for protection
against voltage surge {lightening etc}
GDT-when voltage is increased then it convertinto ions in GDT tube .it works as an insulator.
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Capacity of current-200mA when current more
than 350mA than it will operate as insulator.
MDF Tool :1.Wrapping Gun
2.Vacuum cleaner
3.Drill machine
OCB Exchange tag Block
1. Line side-100 pair tag block{10*10}
2. Xge side-128 pair tag block {10*8}
corDECT WIRELESS IN LOCALLOOP
The corDECT system has six major sub
systems. These are:
DECT Interface Unit{DIU}: Performs systemcontrol and interfaces to telecom network.
Compact Base Station{CBS}:Provides wireless access in the area on twelve
simultaneous channels.
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Wallset{WS}:A wireless fixed terminal, connected to any standard
telephone, modem or fax machine.
Handset{HS}:A portable telephone providing voice service to a
user.
Base Station Distributor{BSD}:
Connects four remotely located CBS to the DIU usingan EI link.
Network Management System {NMS}:Manages multiple DIUs and there associated CBS andWall sets each corDECT System comprises of one DIU,
20 compact base stations, and up to 1000 handsets or
wallsets, typically between 30-70 per CBS.A wallset
can be used up to 5km from a base station with a line-
of-sight-link, while a handset can be typically usedwithin 50-300 m from a base station depending on the
obstructions between the base station and itself. Each
base station is connected to the DIU using three pairs of
0.4 mm twisted pair cable. Alternatively, a base station
may be connected to a Base Station Distributor, which
itself is connected to a DIU on an EI optical fiber orradio link. To service subscribers in sparely populated
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areas, it is possible for a wallset to be programmed in a
special mode which would allow it to be used up to 10
kms from a base station with a line-of-sight-link. The
manner in which the corDECT subsystems are
interconnected.
DECT Interface Unit:
The DIU is a DECT exchange for wireless subscribers
and provides an interface to Public Switched TelephoneNetwork{PSTN}.functions such as call processing,
CBS powering, and PCM/ADPCM transcoding are
handled by the DIU. System operation and
maintenance{O&M},and remote fault monitoring can
be performed from theDIU or alternatively from a
remote location using the Network ManagementSystem.
Common Base Station:
The CBS is a small, unobtrusive, pole mounted or wall-
mounted unit. Each CBS serves one cell, providing upto 12 simultaneous speech channels. The cell radius
depends on the propagation environment and antenna
gain of the handset/wallset. Typically,it ranges from
0.1-5 kms.
Handset:
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The handset is a small, light weight portable unit
operated from re-chargeable batteries. It allows the user
to make calls from within the coverage area of the CBS
connected to one DIU. The handset has intelligence to
handover from one CBS to another. The same HS can
be used with different DIUs{say at home & office}by
appropriate re-registration when moving from one
location to another
.
Wallset:
The wallset is a small wall-mounted unit with an
external antenna and powered from a/c mains. An
internal battery provides backup in case of power
failure. The external antenna provides gain and extends
the range of a CBS in areas where CBS density is low.The wallset provides a standard RJ-11 telephone socket
so that any telephone, fax machine, modem or even a
payphone can be connected to it.
Base Station Distributor:
The Base Station Distributor is an optional unit used
when a cluster of CBS are to be located some distance
away from the DIU. The BSD is connected to the DIU
on EI lines and each E1 carries signals for four CBS.
Network Management System:
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The corDECT system provides a Network Management
System{NMS}which could be used to manage up to 30
DIUs and their subscribers.
Relay Base Station:
In order to extend coverage to 25kms.a relay base
station is required.
WIRELESS LOCAL LOOP SYSTEM
Introduction to WLL:
A Local Telephone System without wire line connected
to fixed radio communication system is known as
Wireless Local Loop.
What is Wireless Local Loop{WLL}? WLL is sometimes called fixed cellular.
WLL system can be treated as a wire line loop
system without wire line connected.
WLL is normally used for rural or unpopulatedareas.
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WLL can be quick solution fir developing
telephone infrastructure.
Why use WLL?
Eliminates many problems and reduce cost
inherent to wireline loop system in certain areas.
Decreases the time to deploy a network.
Mobility and flexibility.
Advantages of WLL
Ease of installation and deployment and lower
cost. Ease of operation, administration and
maintenance and lower cost.
Advantages over Mobile Bigger coverage area
Improved signal and reduced interference{fixed to fixed link}
Higher capacity
Fixed to fixed propagation
WLL propagation {fixed to fix} using freespace loss formulas based on 29db/sec.
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Mobile radio propagation {fixed to
mobile} based on 40db/sec.
UNDER A No-MULTIPATHCONDITIONANTENNA ARE PLACED AT HIGH
SPOTS OF BUILDING
C/I=10 dB under a non-fading fixed to fixed condition.
C/I=18 dB under a mobile radio condition.
Frequency reuse distance is reduced
DUE TO DIRECTIONAL ANTENNAS:
Fixed-to-fixed link {using directional antennas in
both ends}.
Mobile-to-fixed link {using directional antenna
on the end}.
DUE TO THE C/I
For C/I=10 dB, the frequency reuse distanceD equals 2.78 times the cell radius R.
For C/I=18 dB, the frequency reuse distance D
equals 4.6 times the cell radius R.
AN: Access Network ALM: Antenna Line Data Module
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E1: 2.048 Mbps PCM Link
EQN: Equipment number
ETSI: Euopian Telecommunications
Standards Institite
FITL: Fibre In The Loop
FRS: Fault Record System
FDMA: Frequency Division Multiple
Access FRFC:Float Rectifier Float Control
GPC:Global Path Control
GRRA:Global Routing and
Resource Allocation
GSM:Geographic Service Mobile HDT:Host digital Terminal
HTML:Hyper Text Mark up
Language
ISDN: Integrated Service Digital
Network
ITC: Indian Telephone Card
IMSI: International Mobile
Subscriber Identity
LE: Local Exchange
LCC: Line Connected Card
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LJU: Line Jointer Unit
LCD: Liquid Crystal Display
MDF :Main Distribution Frame
MMS: Multimedia Message Service
MAX: Main Automatic Exchange: A
Generic Term Used for C-DOT Family of
Switching Systems
MAX-L :Main Automatic Exchange-Large
MAX-XL: Main Automatic
Exchange-Extra Large
MMI: Man Machine Interface
ONU: Optical Network Unit OTP: Originating Terminal Process
OMC: Operation & Maintenance
center
OCB: Operation Control Bherison
PCM: Pulse Code Modulation
PSTN: Public Switched Telephone
Network
PHC: Protocol Handler Card
POTS: Plain Old Telephone System
PDA :Personal Digital Assistant
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PRA: Primary Rate Access
SMS: Short Message Service
SIM: Subscriber Identity Module
SMPS: Switch Mode Power Supply
SBM: Single Base Module
SCP: Status Control Process
SMH: Signalling Message Handler
SU: #7 Signalling Unit TTP: Terminating Terminal Point
TDMA: Time Division Multiple
Access
UPS: Uninterrupted Power Supply
V5.X:Standard Interface Specified byETSI between LE and AN
VU:V5 Unit
VRLA: Value Regulated Lead Acid
WLL: Wireless in local loop
SOME OTHER INFORMATION:
INDIAN TELECOMCARDS,ITC{VCC}:ITC service is also known as
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prepaid card calling service. This is a hard paper
card containing a secret card number printed on it.
Unlike a magnetic card, it is not used physically in
connecting a call. This service allows a user to makea call from any telephone any destination by using
this card number and charges are debited his ITC
without any charging on the telephone number used
for making such a call by Card holder.
PREPAID CALLING CARDS OF THE FOLLOWINGDEMONATIONS ARE AVAILABLE:
a. Rs.102/-for making local calls
b. Rs.216/-foe making local and STD calls
c. Rs.524/-for making local, NSD&ISD
calls
FACILITIES AVAILABLE IN ELECTRONIC
EXCHANGES
1.DYNAMIC LOCKING/UNLOCKING OF
STD CALLS: This facility is available in allelectronic exchange except C-DOT-128 and NEAX
exchange. By using this facility the subscriber can
lock/unlock ISD/NSD/RSD calls, so as to avoid
misuse. This procedure in different exchanges is as
given on page no. XLVIII.
2.CALL WAITING{ALERT}FACILITY32
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3.Wake up/Reminder Call facility
4.Hot Line
5 . Abbreviated Dialing
6 .Call TransferCLI{calling line identification}
8.Computerized Automatic
Switching RoomSwitch Room Consists of Different
Racks
SMM RACK: Multi System Multi station
SMC RACK:Main Control Station SMX RACK: Switching Matrix SMA RACK:Auxiliary Multi Station
CSN RACK:Subscriber Rack{digital network concentrated }
SMT RACK: Trunk Multiple Station
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SMM Rack is the head of exchange .All type of
programming is control through this rack. This rack
may be divided into two parts: SMMAA. &
SMMA B.SMM b. Rack consists of the followingparts:
GX
MR
TR
MQ PC
SMC Rack : in this rack all the facility of the
subscriber are store in this rack like Lock facility ,
out going calls and incoming calls, CLIP ,
STD/ISD etc.SMX :- All the call made through this rack. SMX
give the route for destination.
SMA : In this rack all the secondary function
performed .
CSN : All the subscribers Numbers are
terminate in this rack . CSN rack connect the
exchange side and subscribers .
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SMT :- In the Rack all the PCM are terminate
in this rack. SMT RACK connect with TAX
exchange through OFC.
Sign of Co-ord (T&P) Sign. Of officer in charge Training
SLIET Of organization.
CONTENTS/INDES
1. About Exchange
2. Detail about components of
communication system
3. Parts of exchange
4. Connection in the E/A room
5. OMC room
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6. PC
7. Internet
8. Battery and Power Plant
9. Types Of Power Plant10.Parts of power plant
11.OCB-283 system
12.Transmission
13.MDF
14.CorDECT WLL15.WLL
16.Abbreviations
17.Other information
18.Switch room
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