Nortel BCM50, Installation And Maintenance Manual

Page: 191 / 246

Chapter 24 Replacing an internal component 191
BCM50 Installation and Maintenance Guide
To disconnect the cables
1 Remove the 25-pair cable from the RJ-21 telephony connector on the front of the BCM50
main unit.
2 Remove the Ethernet cable from the LAN port.
3 If the main unit is a BCM50a or BCM50e, remove the Ethernet cable or ADSL line from the
WAN port and the Ethernet cables from the Router card LAN ports.
4 Remove the expansion cables or LAN cables from the Expansion ports on the BCM50 main
unit. For the expansion cables, make sure you mark the cables with the number of the port to
which they were connected.
5 If the system uses the external Music Source port, remove the cable from the Music Source
port.
6 If the system uses a UPS, remove the USB cable from the USB port.
7 Rotate the power supply retention clip to free the power supply cord.
8 Remove the power supply cord from the BCM50 main unit.
9 Continue to the next step, “Removing the main unit” .
Removing the main unit
The method you use to remove the main unit depends on how the unit is mounted. Use one of the
following procedures to remove the BCM50 main unit:
• “To remove a rackmounted main unit”
• “To remove a wallmounted main unit” on page 192
• “To remove a desktop-mounted main unit” on page 192
To remove a rackmounted main unit
1 Ensure that all the cables are removed from the main unit.
If they are not, refer to
“To disconnect the cables” .
2
If a unit is mounted on top of the main unit, slide that unit forward until it disengages from the
clips on the main unit. Lift the unit off of the top of the main unit.
3 If the main unit has been secured to the rackmount shelf with screws, remove these screws
from the bottom of the rackmount shelf.
4 Slide the main unit forward until is disengages from the clips on the rackmount shelf.
Warning:
Leakage currents
You must disconnect the telephony and data networking cables from the system
before disconnecting the power cord from a grounded outlet.