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SS7G2x Signaling Server SGW Mode User Manual Issue 4
An SS7 Route (C7RT) identifies the link sets that are used to reach an eventual Destination Point Code
(DPC). Two SS7 routes cannot have the same DPC within the same network. An SS7 route utilizes link sets
(LS1 and LS2) to adjacent points to reach an eventual destination. An adjacent point can be a Signaling
Transfer Point (STP), where SS7 information is forwarded on into the SS7 network, or the eventual
destination. SS7 routes are managed using the C7RTx commands.
SS7 MTP2 Operation
An SS7 signaling link (C7LINK) processor (EQU) receives and transmits SS7 signaling information over a
timeslot (TS) on an E1 or T1 bearer or a serial V.11 interface. An SS7 Signaling link is identified uniquely
within an SS7 link set by the Signaling Link Code (SLC). Signaling links are managed using the C7SLx
commands.
Figure 6. SS7 Signaling Example
Figure 6 demonstrates a Signaling Gateway routing to two SS7 Signaling End Points (SEP). The first SEP is
reached by a pair of STPs, while the second SEP is reached directly from the Signaling Gateway. Example
MML for the above configuration is:
C7LSI:LS=1,OPC=1,DPC=2,SS7MD=ITU14,LSSIZE=2,NI=2,NC=1;
C7LSI:LS=2,OPC=1,DPC=3,SS7MD=ITU14,LSSIZE=2,NI=2,NC=1;
C7LSI:LS=3,OPC=1,DPC=4,SS7MD=ITU14,LSSIZE=2,NI=2,NC=1;
C7SLI:C7LINK=1,LS=1,EQU=2-1,TS=1-3-16,SLC=0;
C7SLI:C7LINK=2,LS=1,EQU=3-1,TS=2-3-16,SLC=1;
C7SLI:C7LINK=3,LS=2,EQU=2-2,TS=1-4-16,SLC=0;
C7SLI:C7LINK=4,LS=2,EQU=3-2,TS=2-4-16,SLC=1;
C7SLI:C7LINK=5,LS
=3,EQU=2-3,TS=3-3-16,SLC=0;
C7SLI:C7LINK=6,LS=3,EQU=3-3,TS=3-4-16,SLC=1;
C7RTI:C7RT=1,NC=1,DPC=2,LS1=1,LABEL=STP1;
C7RTI:C7RT=2,NC=1,DPC=3,LS1=2,LABEL=STP2;
C7RTI:C7RT=3,NC=1,DPC=4,LS1=3,LABEL=SEP2;
C7RTI:C7RT=4,NC=1,DPC=5,LS1=1,LS2=2,LABEL=SEP1;
SS7 M2PA Operation
The Signaling Gateway is capable of replacing TDM SS7 links with signaling links operating over IP providing
the equivalent functionality to MTP layer 2 by using the SIGTRAN M2PA protocol. Typically M2PA signaling
links would be used when the Signalling Gateway is either offering longhaul over IP operation between two
SEPs, or when two Signaling Gateways are acting as a single Point Code and the inter Signaling Gateway SS7
link is provided by M2PA over IP.
For M2PA operation, rather than associating an EQU or TS with an SS7 signaling link (C7LINK), the SS7 link
is instead associated with a SIGTRAN link (SNLINK) defined to be of type M2PA. The SIGTRAN link is used to
identify a SCTP Association as being used for M2PA operation.
Signaling
Gateway
PC 1
SEP 2
PC4
STP2
PC3
STP1
PC2
SEP 1
PC5