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The circuit group control will then appear as shown in
Figure 12.
The user application software should reset all idle circuits
following a transfer, and reset all remaining circuits as
they become idle.
When the failed unit recovers, control of the circuits may
be transferred back by the application.
Circuit group control is transferred by the application in
two stages. The group should be deactivated from one
unit (if communication with that unit is possible) before
being activated on the partner SIU. To protect against
control being active on both units at the same time, the
SIU automatically issues a deactivate command to the
partner unit in response to an activate command from
the host application and checks the status of each circuit
group on the partner unit. An API management event
indication is given if dual control is detected.
Application Note Building Fault-tolerant SS7 Systems Using the Intel
®
NetStructure™ SIU520 SS7 Signaling Gateway
12
Figure 12. Routing Following Failure of SIUA
SIUB
MTP1-3
Circuit Group 1
[Active]
Adjacent
Signaling
Point
Application
TCP/IP Ethernet
SIUA
Circuit Group 0
[Active]
SS7