Nortel Networks 1000E warranty Lock and Unlock commands, Switchover Timer

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