Nortel Meridian 1 Manual page 30

Page 18 of 224 Attendant consoles
553-3001-215 Standard 10.00 June 1999
When you are setting the QMT2 switch on the M1250 attendant console's
PCB, ON indicates that the QMT2 is enabled, and OFF indicates it is disabled
(see Procedure 6). You can query the status of the switch by going to the
Diagnostics menu and selecting the QMT2 option. The Display menu
CHANGE feature provides only a temporary change to the QMT2 status.
Note: On attendant consoles with a digit display attached to the top
cover, do not connect or disconnect the cable to the digit display unless
the attendant console line cord is disconnected.