Chapter 4 Turning on the Avaya P460
Removing or Switching off a PSU
If there is one PSU
The entire chassis turns off
If there are two PSUs
1When 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 Power Allocation after PSU Removal
|
|
|
| No |
| Start power allocation |
| Power enabled |
|
|
| for slot 5? |
| |
|
|
|
| |
|
|
| Yes |
|
| Power enabled |
| Sufficient power |
|
| for slot 3? | No | budget? |
|
| Yes |
| Yes |
|
| Sufficient power |
| Apply power to slot 5 | No |
| budget? |
|
|
|
| Yes |
|
|
|
|
|
| Power enabled |
|
No | Apply power to slot 3 |
| for slot 6? |
|
|
|
| ||
|
|
| Yes |
|
| Power enabled |
| Sufficient power |
|
| for slot 4? |
|
| |
|
|
| budget? |
|
| Yes |
|
|
|
|
|
| Yes |
|
| Sufficient power |
| Apply power to slot 6 |
|
| budget? |
|
| |
|
|
|
| |
| Yes |
|
|
|
| Apply power to slot 4 |
|
|
|
Avaya P460 Installation and Maintenance Guide | 21 |
