Nortel DMS-100 Series Maintenance Manual page 55

The sequence for a controlled and uncontrolled SWACT and the
SWACT-back operation of feature AN0538 appears in this figure. The
following sections describe this feature.
SWACT sequence
1. CC uses manual command
or REx schedule to start
warm SWACT
3. SWACT tells inactive unit
to gain activity
4. New active unit sends
gain messages to CC
5. CC sends gain ACK
to SMS
6. SMS sends ACK received
to CC
7. Original active unit is
SysB and RTS
8. SWACT complete
2. Implemented Pre-SWAT audit
Pass
>15 s for retries
DMS-100 Family SMS Maintenance Manual XPM10 and up
Maintenance overview 1-39
1. SMS starts SWACT
because of trap or error
Fail
3. If manual, respond to
message to continue
>SWACT FORCE
PM181
Pre–SWACT audit failure
REx failed warm SWACT
SMS is ISTb
SWACT back to original unit
SysB and RTS the inactive unit
PM189
Exhaust Retry
PM181
Post–SWACT audit failed
failed warm SWACT