Nortel Networks BCM50 manual Preparing the system for maintenance, To disconnect the cables

174Chapter 21 Replacing a main unit

Refer to the following sections for information on replacing the BCM50 main unit:

•“Preparing the system for maintenance”

•“Removing the main unit” on page 175

•“Installing the new main unit” on page 176

Preparing the system for maintenance

In most cases, if the BCM50 main unit is faulty, the system will already be shut down. If this is the case, proceed to “To disconnect the cables”. If the system is still operating, perform the following procedure:

To shut down the system

1Check for a recent backup of the BCM50 system programming.

2If there is no recent backup, use Element Manager to back up the system data. For information about backing up the system data, refer to the BCM50 Administration Guide (N0016868).

3In Element Manager, from the Administration tab, click the Utilities folder to expand it.

4Select Reset from the Utilities folder.

5Click Reboot BCM50 System to reboot the system. The BCM50 system begins the shutdown process.

6Unplug the main unit, when the status and power LEDs go from solid green to flashing orange.

7Continue to the next step, “To disconnect the cables”.

To disconnect the cables

1Remove the 25-pair cable from the RJ-21 telephony connector on the front of the main unit.

2Remove the Ethernet cable from the LAN port.

3If the main unit is a BCM50a or a BCM50e, remove the Ethernet cable or ADSL line from the WAN port and the Ethernet cables from the Router card LAN ports.

4Remove the expansion cables or LAN cables from the expansion ports on the main unit. For the expansion cables, make sure you mark the cables with the number of the port to which they were connected.

5If the system uses the external Music Source port, remove the cable from the Music Source port.

6If the system uses a UPS, remove the USB cable from the USB port.

7Rotate the power supply retention clip to free the power supply cord.

8Remove the power supply cord from the main unit.

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