AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 118

Using SPM
This procedure is used to program a new system if a disk was created through
surrogate mode programming, or to restore information (using a backup disk)
lost through system failure. It is also part of the upgrade procedure.
Considerations
Review the following items before you begin the restore procedure.
The system will be forced idle during a restore procedure.
You must have a backup file containing system programming before you
use this procedure. See "Backup."
Features that were not programmed when the backup file was created are
reset to factory defaults.
The data restored reflects the number of extensions and lines available on
the system at the time the backup was created. The remaining extensions
and lines will be set to the default values that are initialized during a
Restart (cold start).
Restore is terminated under the following conditions:
If fewer boards are listed on the disk than on the control unit.
If any real board is out of sequence with the boards listed on the disk.
If phantom boards are not listed last.
If the operating mode of the system being restored is Hybrid/PBX, but
the control unit processor module has been modified to operate only in
Key mode.
A successful restore is followed automatically by a Restart (cold start).
!
WARNING:
An unsuccessful or terminated restore results in a System Erase (frigid
start). All calls are dropped. The system configuration is erased. All system
programming is lost, and the system returns to the factory settings. If the
restore is being done remotely, the connection is dropped immediately. If
this happens, attempt to reconnect to the control unit and immediately
perform another restore. If this is not successful, programming must be
restored on site.
Follow the steps below to perform a restore.
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Programming with SPM