MULTIMEDIA UNIVERSITY OF KENYA
ETI 2506 - TELECOMMUNICATION SYSTEMS
SIGNALLING

CONTENTS
1.0 INTRODUCTION
2.0 IN-CHANNEL SIGNALLING
3.0 COMMON CHANNEL SIGNALLING (CCS)
4.0 COMPARISON BETWEEN IN CHANNEL & COMMON CHANNEL SIGNALLING
5.0 CCS NO. 7

1.0 INTRODUCTION



2.0 IN-CHANNEL SIGNALLING


3.0 COMMON CHANNEL SIGNALLING



4.0 COMPARISON BETWEEN IN CHANNEL & COMMON CHANNEL SIGNALLING

IN-CHANNEL

COMMON-CHANNEL

Trunks are held up during signalling
Trunks are not required for signaling
Interference between Voice and Control Signals may occur
No interference since the voice and control channels are separate

Separate signaling equipment is required in each trunk hence expensive

Only one set of signaling equipment is required for a large group of trunk circuits hence economical
Can be misused by customers since it is easy to mimic voice signaling
Control channel is in-accessible to users
Signalling is relatively slow
Signalling is much faster
Speech circuit continuity is assured when signaling is received
State of speech circuit not automatically assured
It is difficult to change signals or add new signals
There is flexibility to add new signals or change existing signals

5.0 CCS NO. 7




                                                                                                                                                        © 
Prof. Ambani Kulubi May-Aug 2015