Chapter 39 Hardware procedures 447
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Removing power cables
Remove power cables so that you can replace faulty cables or if you need to
do so as part of another maintenance task.
Prerequisites
Procedure steps
1 Toggle to the standby position the power control on the power supply
serviced by the cable you want to remove. See the appropriate figure
• “Multiservice Switch 7420 power control” (page 393)
• “Multiservice Switch 7440 power supply” (page 467)
• “Exploded view of power supplies in a Multiservice Switch 7460”
(page 473)
• “Unlocked power supply on a Multiservice Switch 7480 with the
power control in the standby position” (page 476)
2 At the power distribution panel, toggle off the circuit breaker for the outlet
that supplies power to the cable you want to remove. Ensure that the
outlet is void of primary power.
3 If the shelf is a Multiservice Switch 7460 and is connected to the front-
facing power and alarm panel (NTEP67BA), disconnect the power cabling
from the panel.
Note: If you are removing power cabling for a Multiservice Switch 7460
and it was connected to a front-facing power and alarm panel, do not
continue this procedure until the shelf has been removed from the rack.
4 If you are removing a dc cable, disconnect the cables from the disconnect
device.
or
CAUTION
Risk of service loss
If a device does not have redundant power, remove the
device from service before removing a power cable or
power supply. For information about minimum and
redundant power configurations, see NN10600-170
Nortel Networks Multiservice Switch 7400 Hardware
Description.
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