Nortel 1000E Installation And Configuration Manual page 463

Configuring MG 1000T survivability and alternate primary controller
2 The SWOTO expires after the time defined in LD 117.
3 The MG 1000T Expansion re-starts. As the MG 1000T is going through
the re-start procedure, it attempts to register with the MG 1000T Core.
4 If a connection cannot be made to the core processor, the MG 1000T
Expansion comes up in Survival Mode.
Manual Switchover to Survival Mode
Manual commands are provided to enable a technician to force a switch over
to Survival Mode. These commands are available only on the MG 1000T
Core. They can be used only if an IP link is established between the
MG 1000T Core and an MG 1000T Expansion. To manually switch over to
Survival Mode, use the SOTS command in LD 135.
After the SOTS command has been successfully executed, the MG 1000T
Expansion remains in Survival Mode until the Switchback From Survival
(SBFS) command is issued. The SBFS command is issued in LD 135.
In Survival Mode, a valid database must be downloaded to the MG 1000T
Expansion in order to function. The database is downloaded or
"synchronized" each time a datadump is performed. An exact copy of the
database on the MG 1000T Core is downloaded to the MG 1000T with every
datadump.
CAUTION — Service Interruption
A manually invoked switch-over causes a restart of the
MG 1000T.
CAUTION — System Failure
If the software is upgraded on the MG 1000T Core, it
must also be upgraded on the MG 1000T Expansion for
Survivability to function.
Communication Server 1000E
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Installation and Configuration