Nortel Networks M3110 - Manual (Page 64)

Page 64 of 504 Attendant consoles
553-3001-367 Standard 3.00 August 2005
Performing a loopback test
Follow the steps in Procedure 10 to perform a loopback test on the M2250
attendant console.
Procedure 10
Performing a loopback test on the
M2250 attendant console
1 Make a loopback connector. Prepare a blank 25-way RS-232 plug by
internally connecting pins 2 and 3 together with strapping wire.
2 Press the Shift key to access Level 1 mode.
3 Press the F4 (function) key to access the Diagnostics menu on the LCD
screen.
4 Plug the loopback connector into the Data Port RS-232 jack in the back
of the console.
5 Select the Data Port option from the Diagnostics menu by dialing 3. The
LCD screen displays OK when the test is successfully completed.
If there is a hardware fault on the M2250, A0H is displayed.
If the blank RS-232 connector is not plugged into the data port correctly
(as described in Step 4), the display reads 90H or A0H.
6 Press the asterisk (*) key to repeat the test.
7 To exit the test mode press the octothorpe (#). to return to the main
Diagnostics menu.
8 Press the octothorpe (#) to return to normal operating mode.
9 Remove the loopback connector from the Data Port RS-232 jack.
End of Procedure
Designating keys on the M2250 attendant console
Refer to the work order to determine the features and key designations for
each attendant console. Designate each key on the attendant console by
placing its feature name (from the designation sheet) in the key cap that fits
on the key.