I hope,my presentation will be helpful to you all

1. RUNGTA COLLEGE OF ENGINEERING & TECHNOLOGY
PREPARED BY:
PRERNA SHARMA

2. SWITCHING SYSTEM:
 The switching centers receives the control signals,
messages and forwards to the required destination.
 A switching system is a collection of switching
elements arranged in a way to setup a communication
path between any two distant points

3.  In computer communication, the switching technique
used is known as packet switching
 In telephone network the switching method used is
called circuit switching

4. Elements of switching system:
 Elements include:
i. Trunk interface
ii. Subscriber line interface
iii. Service circuit interface
iv. Controller
v. Operator console
vi. Subscriber service line & distributor unit
vii. Trunk circuit scanning & distributor unit
viii. Junctor

5. BLOCK DIAGRAM
FOR
ELEMENT OF SWITCHING
SYSTEM

6. INCOMING OUTGOING
TRUNK INTERFACE TRUNK INTERFACE
J
SUBSCRIBER LINE SUBSCRIBER LINE
INTERFACE SWITCHING INTERFACE U
NETWORK N
SERVICE CIRCUIT SERVICE CIRCUIT C
INTERFACE INTERFACE T
O
R
SUBSCRIBER CONTROLLER TRUNK
& SERVICE
LINE CIRCUIT
SCANNING & SCANNING &
DISTRIBUTOR OPERATOR CONSOLE DISTRIBUTOR
UNIT UNIT

7.  Trunk: A trunk is a line or link designed to handle
many signals simultaneously. It often consists of
multiple wires
 Junctors : In a telephone junction box, a small section
of twisted wire pair that is used to attach incoming
lines with outgoing lines.
 Subscriber circuit interface: It alerts the central
office system that user wishes to make a call. Transmitt
number to be called and convert signal to digital form.

8. Thank you