To Troubleshoot The Expansion Unit; Testing An Mbm - Nortel BM450 Troubleshooting Manual

30 Chapter 3 Hardware Troubleshooting
4 Check for a dial tone.
5
Use this extension to make a call to another extension on the system.
6
If the expansion unit has an MBM that supports lines, go to an extension that has access to one
of the lines on the MBM.
7
Select the line or line pool to which the line belongs.
8
Check for a dial tone.
9 Make a call using the line or line pool.

To troubleshoot the expansion unit

1
Check that the correct feature for the expansion unit is included in your installed keycode.
2
Check that the expansion port is connected to the proper connector.
3
Check the wiring to the MBM. Make sure that the cables are properly seated and are connected
to the correct ports with proper LED indications.
4
Check that the switches on the MBM are all set to on.
If the MBM is a GASM or GATM, all the switches on the right are not on.
To check the MBM switches, you must remove the MBM from the expansion unit.
5
Perform a firmware download to ensure that the correct version is loaded on the ASM/GASM
or GATM unit.
6
Use Element Manager or Telset Admin to check the programming for the lines or extensions
connected to the MBM.
7
Reboot the system to ensure that the BCM450 main unit functions correctly.
8
If the programming is incorrect, use the Backup and Restore Utility to load a recent backup of
system programming. If a recent backup is not available, correct the programming using
Element Manager or the Telephone Administration feature.

Testing an MBM

Use the following procedure to test an MBM installed in the main unit or
expansion cabinet.
If you are experiencing an issue with an FEM, ensure all DIP switches are set to
the On position.
Procedure steps
Step
1
2
NN40160-700 NN40160-700
Action
Check the Power and Status LEDs on the MBM. Both LEDs must be solid
green. If either LED is not solid green, a problem exists with the MBM.
Go to an extension on the MBM if it is a station MBM.
OR