Landline Switching Technology - BSNL Durg SSA(Connecting India)

steamgloomyElectronics - Devices

Nov 15, 2013 (3 years and 9 months ago)

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A


PRESENTATION


ON



LANDLINE SWITCHING



TECHNOLOGY


INTRODUCTION

A

telephone exchange

is
a

telecommunications

system used in the

public
switched telephone network

or in large
enterprises
.



An
exchange consists of electronic components
and in older system also human operators that
interconnect (
switch
) telephone subscriber lines
or virtual circuits of digital systems
to
establish

telephone calls

between subscribers.


EXCHANGE LAYOUT

Typical exchange consist of:
-


1.Switch Room


2.Operation
Maintainanace

Room(OMR)


3.Input Output Processor Room


4.Battery Room


5.Power Plant Room


6.Main Distribution Room

MAIN SECTIONS OF
EXCHANGE

There are three components of exchange:
-


1.MDF


2.Power Plant


3.Switching Room





The Switching Equipment common to all the
subscriber of the area is located in an
exchange

To make possible for a subscriber to
communicate with remaining subscriber
must be connected to the exchange

From OCB through PCM connected to
various sections like WLL,TAX, etc
.


MAIN DISTRIBUTION FRAME

>
The
primary function of MDF is to remove fault. It
is
also known as
Fault Remove Section.



>
The telephone numbers are also disconnected in
the MDF because of some specific reason.

ORGANISATION OF THE MDF




Vertical side



Horizontal side

VERTICAL SIDE

RACK:
-
On the rack, the tags are situated. One rack is having
eight tags. The counting is done from up (0) to down (7).


TAGS:
-
Each rack consists of eight tags.

1 tag = 4 core

1 core = 4 bunch

1 bunch = 2 line


N.E.:
-
The word NE stands for the
‘NUMBER OF EQUIPMENT’.

It is used for testing number and


WEDGE:


Wedge is used as a device for checking the ring.
Wedge is placed in jack strips, which is connected to
telephone for checking.


HORIZONTAL SIDE


The horizontal side connected to the underground
cable.

This cable is having 100 pairs. These pair is
distributed when we allot the telephone number to
the subscriber.


Horizontal side is again subdivided in two parts:



Another
with the subscriber line by using 100 pair
underground cable
.



One part is connected with the vertical side.



DIFFERENT TYPES OF FAULTS

LOOP FAULT:
-
If two wires are joined together because of
improper connection,

storming air etc.


EARTH FAULT:
-
If two wires get scrape at some places and if
this wire comes in

contact with tree, pillar or any metal objects then this type of
fault occurs.


CABLE FAULT:
-
For outdoor connections, jelly filled wires are
used which are affected by natural causes such as rain,
earthquake etc. At such time this fault occurs.


DISCONNECT FAULT:
-
This type of fault occurs due to the
breaking of wires between the vertical side & LEN side.



POWER PLANT

T he main parts of the Power Room are:
-



1.Batteries


2.UPS(Uninterrupted Power Supply)


3.Charging Discharging Unit


4.Inverter and Convertor Unit


OCB
-
283 EXCHANGE

OCB
-
283(
orgando

commando B
-
type
2nd
Generation 8300
microprocessor exchange)
is
digital switching system which supports a
variety of

communication needs like basic telephony,
ISDN, etc.


This
system has been

developed by CIT ALCATEL of France and
therefore has many similarities to its

predecessor E
-
10B (also known as OCB
-
181 in
France).

Connection & Control
Units

SMC :Main Control Station


SMA :Auxiliary Equipment Control
Station


SMT :Trunk Control Station


SMX :Matrix Control Station


STS :Synchronization and Time Base
Station

FEATURES OF OCB
-
283

1.It
is a digital switching
with
single‘T
’ stage
switch. A maximum
of 2048 PCM’s
can be
connected
.


2
. It supports both analog and digital
subscribers.

3. It
provides telephony, ISDN, Data communication,
cellular radio,
and other

value added services.

4.The
traffic handling capacity of the system is huge.

OCB FUNCTIONAL UNIT

The OCB283 system is made

up of three independent functional units :


-

"Subscriber Access Subsystem" which carries
out connection of analogue and digital subscriber
lines.


-

"Connection and Control" which carries out
connections and processing of calls


-

"Operation and Maintenance" which is
responsible for all functions needed by the
network operating authority.



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


GENERAL ARCHITECTURE 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.