Chapter 3
Maintaining the Chassis
Replacing Power Supplies
3-2
Catalyst 8540 Chassis Installation Guide
78-6134-03
Replacing Power Supplies
The redundant AC and DC power supplies support hot swapping. When two
power supplies are installed, you can remove or install one supply without
affecting system operation. When power is removed from one supply, the
redundant power feature enables the redundant power supply to ramp up to full
power and maintain uninterrupted system operation. In systems with dual power
supplies, connect each power supply to separate input lines so that, in case of a
line failure, the second source is available and can maintain uninterrupted power
to the system.
A 20A modular power cord connects each AC power supply to a separate site
power source. Many telcos require the DC power supply because these
installations are powered by –48 or –60 VDC batteries. From an operational
perspective, the DC-input power supply has the same characteristics as the
AC-input version.
Note
Installation is approved for use with copper connectors only. Make
the attachment of the chassis ground M4 pemnuts directly to the
central office or other interior ground system with a number 6 AWG
copper ground connector as a minimum. The chassis employs two
threaded M4x7 chassis ground M4 pemnuts. These pemnuts are
located on the front of the chassis. The grounded chassis M4
pemnuts require M4 bolts and locking hardware, which are not
included.
Tools Required
To replace a power supply, you need the following tools:
•
A 1/4-inch flat-blade screwdriver
•
A power supply bay cover