21-08-2012, 04:24 PM
SIGNALING SYSTEM NUMBER 7
SIGNALING SYSTEM.ppt (Size: 1.27 MB / Downloads: 36)
Introduction to Signaling System
Transmission: A way by which the information is transported in cost efficient way from
Source to Destination Point over a physical line.
Switching: A process by which an inlet has to be connected through a correct outlet.
Thus we have two type of signaling systems.
UNI Signaling System.
NNI Signaling System.
UNI Signaling System: The most common form of UNI Signaling is “ISDN-Signaling”
or “D-Channel” Signaling. For broadband purposes, we use ATM switching in lower layers.
b) NNI Signaling System: The most common form of NNI Signaling is “Common Channel
Signaling System No. 7 (CCS#7) or Signaling System Number 7 (SS7)”
Signaling System Number 7 is a global standard defined by ITU-T which defines the procedures
by which the information is exchanged between the switches in order to perform functions like
call set up, call management and tear down.
Thus signaling messages are exchanged between the switches over 56 or 64 kbps bi-directional
link called signaling link.
Signaling Network Components
All the Nodes in the SS7 network are called Signaling Points. Following are the signaling points
used in a telecommunication network.
Signaling End Point (SEP): It is a node in a telecommunication network to which subscriber
lines are attached. It is a source or the sink of signaling traffic.
b) Signaling Transfer Point (STP): All the CCS messages travel from one SEP to another by the
services of a STP. The STP switches the messages as received from various SEPs through the
network to their appropriate destination i.e. to the destination SEP.
Architecture of CCS#7 Network
In order to obtain this flexibility, a modular and layered structure is required. The fundamental
principle of CCS#7 is the divisions of functions into a common “Message Transfer Part (MTP)”
on one hand and a separate “User part” on other hand. The same MTP supports as transport
system for different User Parts. We can represent this functionality in a layered manner on
next slide.
Telecommunication network is changing day by day. In order to cope with this changing
environment, a very flexible signaling system is required, which can perform signaling
functions for all kinds of telecom applications, already existing, or even future applications
yet o be defined.
SIGNALING SYSTEM.ppt (Size: 1.27 MB / Downloads: 36)
Introduction to Signaling System
Transmission: A way by which the information is transported in cost efficient way from
Source to Destination Point over a physical line.
Switching: A process by which an inlet has to be connected through a correct outlet.
Thus we have two type of signaling systems.
UNI Signaling System.
NNI Signaling System.
UNI Signaling System: The most common form of UNI Signaling is “ISDN-Signaling”
or “D-Channel” Signaling. For broadband purposes, we use ATM switching in lower layers.
b) NNI Signaling System: The most common form of NNI Signaling is “Common Channel
Signaling System No. 7 (CCS#7) or Signaling System Number 7 (SS7)”
Signaling System Number 7 is a global standard defined by ITU-T which defines the procedures
by which the information is exchanged between the switches in order to perform functions like
call set up, call management and tear down.
Thus signaling messages are exchanged between the switches over 56 or 64 kbps bi-directional
link called signaling link.
Signaling Network Components
All the Nodes in the SS7 network are called Signaling Points. Following are the signaling points
used in a telecommunication network.
Signaling End Point (SEP): It is a node in a telecommunication network to which subscriber
lines are attached. It is a source or the sink of signaling traffic.
b) Signaling Transfer Point (STP): All the CCS messages travel from one SEP to another by the
services of a STP. The STP switches the messages as received from various SEPs through the
network to their appropriate destination i.e. to the destination SEP.
Architecture of CCS#7 Network
In order to obtain this flexibility, a modular and layered structure is required. The fundamental
principle of CCS#7 is the divisions of functions into a common “Message Transfer Part (MTP)”
on one hand and a separate “User part” on other hand. The same MTP supports as transport
system for different User Parts. We can represent this functionality in a layered manner on
next slide.
Telecommunication network is changing day by day. In order to cope with this changing
environment, a very flexible signaling system is required, which can perform signaling
functions for all kinds of telecom applications, already existing, or even future applications
yet o be defined.