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Chapter 7 Configuration Overview
Use the C7LSI command to initiate a link set with the same values for the OPC and DPC parameters and the
value of the DUAL parameter set to zero.
7.6.2.3 M2PA Inter Unit Signaling Links
The Signaling Gateway supports the use of M2PA SIGTRAN links for inter Signaling Gateway communication.
M2PA SS7 links use the SCTP IP protocol to transmit signaling data. Use of IP links between the units rather
than TDM SS7 links allow the systems to be able to present a greater number of TDM links and PCMs to face
the SS7 network. In addition, since the Signaling Gateway supports two IP ports and M2PA supports IP
multihoming, resilience between the units can be gained using redundant IP networks rather than the two
SS7 boards that would be required to offer the same level of resilience.
7.6.2.4 Example
Figure 11 is an example of a DUAL resilient configuration using M2PA links for the resilient links between
units.
Figure 11. Dual Resilient Operation
On Signaling Gateway 1, configure the IP addresses as follows and restart:
CNSYS:IPADDR=194.192.185.11,IPADDR2=194.192.185.11;
MNRSI;
On Signaling Gateway 1, configure the link sets as follows:
C7LSI:LS=1,OPC=2,DPC=1,LSSIZE=2,SS7MD=ITU14,NI=2,NC=1;
C7LSI:LS=2,OPC=2,DPC=2,LSSIZE=2,SS7MD=ITU14,NI=2,NC=1;
On Signaling Gateway 1, configure the SIGTRAN link as follows:
SNSLI:SNLINK=1,SNTYPE=M2PA,IPADDR=194.192.185.12,
IPADDR2=192.195.185.12,END=C;
On Signaling Gateway 1, configure the signaling links as follows:
C7SLI:C7LINK=1,EQU=1-1,TS=1-1-1,LS=1,SLC=0;
C7SLI:C7LINK=2,SNLINK=1,LS=2,SLC=0;
On Signaling Gateway 1, configure the SS7 routes as follows:
C7RTI:C7RT=1,DPC=1,LS1=1,LS2=2,NC=1,LABEL=SEP1;
C7RTI:C7RT=2,LS1=2,DPC=2,NC=1,LABEL=INTERLINK;
LS2
Inter SS7G2x
Linkset
(shown as M2PA)
SG 1
PC 2
NC 1
SEP1
PC 1
NC 1
LS1
SG 2
PC 2
NC 1
194.192.185.11
192.195.185.11
192.195.185.12
194.192.185.12