Nortel BCM50, Installation And Maintenance Manual

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184 Chapter 23 Replacing an expansion unit
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Refer to the following sections for information on replacing a expansion unit:
• “Disconnecting the cables”
• “Removing the expansion unit”
• “Removing the MBM” on page 186
• “Inserting the MBM in the new expansion unit” on page 186
• “Installing the new expansion unit” on page 187
Disconnecting the cables
Use the following procedure to disconnect the expansion unit from the other equipment.
To disconnect the expansion unit cables
1 Use Element Manager to disable the media bay module (MBM) that is installed in the
expansion unit you are removing. Refer to the BCM50 Administration Guide (N0016868) for
more information.
2 Disconnect the expansion cable from the expansion port on the expansion unit.
3 Disconnect the LAN cable from the LAN port on the expansion unit.
4
Disconnect all of the telephone lines and extension cables from the MBM inserted in the
expansion unit.
If there is more than one cable, mark the cables to identify the port from which they were
removed.
5 Rotate the power supply retention clip to free the power supply cord.
6 Remove the power supply cord from the expansion unit.
7 Continue with the next step, “Removing the expansion unit” .
Removing the expansion unit
The method you use to remove the expansion unit depends on how the unit is mounted. Use one of
the following procedures to remove the expansion unit:
• “To remove a rackmounted expansion unit” on page 185
• “To remove a wallmounted expansion unit” on page 185
• “To remove a desktop-mounted expansion unit” on page 185
Warning: Leakage currents
You must disconnect the telephony and data networking cables from the system before
disconnecting the power cord from a grounded outlet.