Lock And Unlock Commands - Nortel 1000E Installation And Configuration Manual

Configuring MG 1000T survivability and alternate primary controller
Page 465 of 488
Switchover Timer
The timer is started on a Survivable MG 1000T as soon as the IP link with the
primary controller 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 MG 1000T Expansion if the IP link with the primary
controller is unstable.
The Switchover Timer is also used during the start-up of a Survivable
MG 1000T Expansion. The timer enables the MG 1000T Expansion to go
into Survival Mode when it cannot connect to the primary controller on
system start-up.
When the IP link is restored for an MG 1000T Expansion in Survival Mode
with AUTOSB configured, the SWOTO timer is started. If the timer expires,
a switchback is initiated to change from Survival Mode to Normal Mode. If
the IP link is detected as down again before the expiration of the SWOTO
timer, the timer stops, and the MG 1000T remains in Survival operating
mode.
Manual Switchback from Survival Mode
After the SOTS command has been successfully executed, the MG 1000T
Expansion remains in Survival Mode until the Switchback From Survival
(SBFS) command in LD 135 is issued.

LOCK and UNLOCK commands

The LOCK and UNLOCK commands are available from the MG 1000T
Core. The LOCK/UNLOCK command can be used in any mode to keep an
MG 1000T Expansion in the current mode, regardless of the state of the IP
link to the primary controller.
For example, a SOTS command forces the selected MG 1000T Expansion
into Survival Mode prior to restarting the MG 1000T Core. A LOCK
command can be issued from the MG 1000T Core prior to a restart. This
keeps the selected MG 1000T Expansion in Survival Mode until manually
returned to Normal Mode. Manually returning to Normal Mode reboots the
MG 1000T Expansion.
Communication Server 1000E Installation and Configuration