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Removing or Switching off a PSU
If there is one PSU
The entire chassis turns off
If there are two PSUs
1
When you remove a PSU from the chassis, the Supervisor Module recalculates
the power budget. If the power requirement exceeds the capacity of one PSU,
the I/O modules are then turned on according to the power budgeting scheme
described below. See Figure 4.1.
a
The chassis is automatically turned on with only the Supervisor Modules
and the fans getting power from the available PSU
b
If all the available I/O modules were operational before the PSU removal/
failure, the Supervisor Module starts to apply power. The power is first
applied to as many I/O modules as possible within the power budget limit
of the single PSU. This can mean that an I/O module with a low power
requirement and low priority is powered up rather than a high power
requirement module with a higher priority.
c
Slots whose power is disabled are skipped.
Figure 4.1
Avaya P460 Installation and Maintenance Guide
Power Allocation after PSU Removal
Start power allocation
Power enabled
for slot 3?
No
Yes
Sufficient power
budget?
Yes
Apply power to slot 3
No
Power enabled
for slot 4?
Yes
Sufficient power
budget?
Yes
Apply power to slot 4
Chapter 4
Turning on the Avaya P460
No
Power enabled
for slot 5?
Yes
Sufficient power
budget?
Yes
Apply power to slot 5
No
Power enabled
for slot 6?
Yes
Sufficient power
budget?
Yes
Apply power to slot 6
21
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