Connecting AC Power
Perform the following steps to connect AC power:
a . Set the power switch located to the left of the AC power cord connector (socket) on the rear of
both power input modules to the OFF position.
b. Plug the AC line cords (supplied) into the power cord connectors in the rear of the power
input modules and plug the other end of each into nearby power receptacles. You must
connect each power cord to a different AC circuit to ensure redundant operation of the
Network 9000 hub,
c . Set the power switches located to the left of the AC power socket on the rear of the power input
module in slot 1 to the ON position. Then do the same for the module in slot 10.
Installing and Removing the AC Power Input Module
If a Redundant AC Power Input Module fails, use the procedures described in the Network 9000
Chassis Hardware Installation and Maintenance Guide to remove the failed module and replace
it with another one.
Operation
During normal operation, each redundant AC power input module shares some of the load of
providing AC input power to the Network 9000 Power Supplies. Specifically, the Redundant AC
Power Input Module in I/O module slot 1 provides AC power to the power supply modules in power
supply slots 1, 2, and 3, while the Redundant AC Power Input Module in I/O module slot 10 provides
AC power to the power supply modules in power supply slots 4 and 5.
Both Redundant AC Power Input Modules maintain in control storage the slot Ethernet addresses
and initializtion configuration changes for each Network 9000 device.
In the event that AC power is lost in one connected circuit, or an AC power input modules fails, the
power supply modules serviced by the failed AC power input module also go out of service, but the
remaining power supply modules continue to provide power to all Network 9000 processor modules
and I/O modules in the chassis, including the control storage of the AC power input module that lost
power.
Prior to the replacement of the failed primary power input module, any processor modules that are
reinitialized will use the secondary module for storing initialization configuration changes.
After the primary module is replaced, when the processor module is next initialized, it will again
use the primary module for storing changes to initialization configurations .
Recovering From Primary AC Power Input Module Failure. Recent releases of software
include features that make it easier to recover from a primary module failure.
The Table A lists the minimum revision of the software and firmware needed on each
processor module to support full redundancy.
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