Nortel Meridian M1250 Description page 59

Powering and reset
After a power failure or a temporary corruption of data, the M1250/2250
attendant console is reset automatically.
If a permanent fault condition is detected, the console enters the maintenance
mode (Position Busy), and a failure message is displayed on the LCD screen.
Note 1: The failure code format is XXH, where XX is a two-digit
hex-code indicating where the fault has been detected. Refer to Tables 3
and 4 for explanations of the failure codes.
Note 2: When the BLF/CGM is attached to the console, an additional
16 V unregulated power source is required.
Attendant console operation
Attendant Consoles Description
Page 59 of 64