Nortel Networks 1000M - Manual (Page 301)

Description 301
CHG AUTOSB <cab#> <Switchback setting>
where
cab# = 1–4
Switchback setting = (YES) NO
When the switchback parameter is set to YES, the cabinet or chassis
automatically switches back from survival mode as soon as the SWOTO
timer expires. If switchback is set to NO, the cabinet or chassis remains in
survival mode until a technician enters the SBFS command.
Switchover timer The timer is started on a survivable IP Expansion
Cabinet or Chassis as soon as the link with the Main Cabinet or Chassis
goes up or down. When the timer expires, the switchover (or switchback) is
triggered. The timer is used to avoid instability in the operating mode of the
IP Expansion Cabinet or Chassis when the IP link with the Main Cabinet or
Chassis becomes unstable.
The switchover timer is also used during the startup of a survivable IP
Expansion Cabinet or Chassis in order to allow the cabinet or chassis to go
into survival mode if the IP expansion cannot connect to the Main Cabinet
or Chassis on system startup.
When the link restores for an IP Expansion Cabinet or Chassis in survival
mode with AUTOSB configured, the SWOTO timer is started.
If the timer expires, a switchback is initiated to change from survival to
normal mode. If a polling message is missed before the timer expires, the
timer is reset.
If the link is detected as down again before the expiration of the SWOTO
timer, the Operating Mode Manager stops the timer, and the IP Expansion
Cabinet or Chassis remains in survival operating mode.
Manual switchback from survival mode
After the SOTS command has been successfully executed, the IP Expansion
Cabinet or Chassis remains in survival mode until the technician issues the
Switch Back From Survival (SBFS) command in LD 135.
Survivability notification
Telephones and terminals
When an IP Expansion Cabinet or Chassis operates in survival mode,
users are notified with a special dial tone and display information. Special
text is also displayed on the remote TTYs connected to the IP Expansion
Cabinet or Chassis.
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Small System Installation and Commissioning
NN43011-310 01.04 Standard
Release 5.0 13 May 2008
Copyright © 2008, Nortel Networks
.