Nortel Meridian 1 Manual page 32

Page 20 of 224 Attendant consoles
553-3001-215 Standard 10.00 June 1999
Procedure 7
Loopback test on the M1250 and M2250 attendant consoles
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. This accesses Level 1 mode.
3 Press the F4 Function key to access the Diagnostics menu on the
liquid crystal display (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 in the M1250, 90H is displayed. 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 (Step 4), the display will read 90H or A0H.
6 Press the Asterisk (*) key to repeat the test.
7 To exit the test mode press the octothorpe (#). This returns you 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.