Backup - AT&T MERLIN LEGEND Release 2.0 System Programming And Maintenance Manual

System Programming and Maintenance (SPM)

Backup

The Backup procedure is used by qualified service personnel to create a file
of system programming information in the \spm\backup directory (hard disk
drive PC) or in the root directory of a diskette (floppy disk drive PC). Backing
up your system regularly is strongly recommended. If you lose system
programming information, you can restore your system quickly from a backup
file.
Release 2.0 Only
If you have a backup diskette and do not know its release number, you may
be able to find this information in the backup header. Backups of Release 2.0
and later versions of Release 1.1 contain a backup header 128 bytes long.
Approximately 59 of these bytes are currently used. Bytes 55 through 59 of
the header contain the feature module identification number, as shown in
Table 2. (Release 1.0 and early versions of Release 1.1 do not contain this
information in readable form.)
Table 2. Backup Header: Feature Module Identification Number
Release No.
2 bytes
S i z e
Examples
02 00
01 01
The release number is found in the first 2 bytes of the feature module
identification number ( 0200 = 2.0, 0101 = 1.1).
If the backup file is compressed, you can still read the header, but you cannot
read the data area following the header. Use type backup filename to read
the header on a DOS system or cat backup filename on a UNIX system.
22
Backup
Build No.
System Size
1 byte 1 byte
01
32
Mode
1 byte
0 1 — Key
0 2 — Behind Switch
0 3 — Hybrid/PBX