Signalling
Definition
Signaling is a protocol. Used to send and receive signal information between Switching Nodes.
Provides the following services to Switching Nodes:
* Exchange control information to connect circuits.
* Set address to interconnect one of switching nodes.
* Network management.
* Establish a specific route & set up a call.
* Check out resource state.
Function
* Setup a call & release a call
* Provides information for a supplementary service
* Provides Operation, Maintenance, Charge Indicator.
SS7(Signaling System 7)
The standard is defined by ITU, the procedures and protocol by which network elements in the public switched telephone network(PSTN) exchange information over a digital signaling network to effect wireless (cellular) and wireline call setup, routing and control. Out-of-Band Signaling Call setup and tear down is faster. Voice circuits are used more efficiently because they are not carrying signaling messages.
ISUP(ISDN USER PART)
Definition:
* The ISDN User Part (ISUP) defines the protocol and procedures used to set-up, manage, and release trunk circuits that carry voice and data calls over the public switched telephone network (PSTN). ISUP is used for both ISDN and non-ISDN calls. Calls that originate and terminate at the same switch do not use ISUP signaling.
* ISUP information is carried in the Signaling Information Field (SIF) of an MSU. The SIF contains the routing label followed by a 14-bit (ANSI) or 12-bit (ITU) circuit identification code (CIC). The CIC is followed by the message type field (e.g., IAM,ACM, ANM, REL, RLC) which defines the contents of the remainder of the message
ISUP Basic Service
1. set up & tear down a basic call
2. continuity test
3. dual seizure control
4. automatic re-route
5. (group) circuit block & restore
General Format
Routing Label + CIC + Message Type Code + M.P + V.P + O.P
Jan 03
Jan
03
Signalling & ISUP
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2 comments:
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