Wednesday, February 23, 2011

Explain SS7 Links ?

SS7 Links

The figure shows the relationship between the link names and the link location (type). Signaling links are logically organized by link type ("A" through "F") according to their use in the SS7 signaling network. 
The "A" (access) links connect the signaling end points (e.g., an SCP or SSP) to the STPs. Only messages originating from or destined to the signaling end point are transmitted on an "A" link. The "B" (bridge) links connect the STP to another STP. The "C" (cross) link connects STPs performing identical functions into a mated pair. "D" (diagonal) links connect the secondary (e.g., local or regional) STP pair to a primary (e.g., inter-network gateway) STP pair in a quad-link configuration. "E" (extended) links connect the SSP to an alternate STP. An "F" (fully associated) link is connected between two signaling end points (i.e., SSPs and SCPs).All SPs (signalling points) are connected using (typically) pairs of Links. 

All links use the same physical connections (typically DS0A - 56K bit/s or DS1 (T1)).


A link (access)
Connects signaling end point (SCP or SSP) to STP
B link (bridge)
Connects an STP to another STP; typically, a quad of B links interconnect peer (or primary) STPs (STPs from a network connect to STPs of another network)
C link (cross)
Connects STPs performing identical functions, forming a mated pair (for greater reliability)
D link (diagonal)
Connects a secondary (local or regional) STP pair to a primary (inter-network gateway) STP pair in a quad-link configuration; the distinction between B and D links is arbitrary
E link (extended)
Connects an SSP to an alternate STP
F link
(fully associated)
Connects two signaling end points (SSPs and SCPs) in the same local network


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