Nortel DMS 100 Series Maintenance Manual page 60

2-44 Maintenance overview
Figure 2-11 SWACT sequence
1. Manual command or REX
schedule CC starts warm
SWACT
3. SWACT informs inactive
unit to gain activity
4. Newly active unit sends
gain messages to CC
5. CC sends gain ACK
to RSC-M
6. RSC-M sends ACK received
to CC
7. Originally active unit is
SysB and RTS
8. SWACT is complete
Pre- and post-SWACT audits
Feature AN0538, RSC-M Pre-SWACT/Post-SWACT Audit improves the
warm SWACT operation. This feature denies the SWACT if the inactive unit
cannot maintain activity or communication with the CC to improve the feature.
Under these conditions, feature AN0538 provides the capability to
297-8223-550 Standard 04.02 November 2000
2. System implements pre-SWACT
audit
Pass
>15 s for retries
1. RSC-M 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
RSC-M is ISTb
SWACT back to original unit
SysB and RTS the inactive unit
PM189
Exhaust Retry
PM181
Post-SWACT audit failed
failed Warm SWACT