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Chapter 7
Power Supplies
7-9
Note –
The presence of an additional (extra) PCM in the system provides
redundancy and allows hot-plug of PCMs.
Failed power supplies must be replaced as soon as practical. Operating an Enterprise
system without a redundant power supply will result in an outage at the next PCM
failure.
7.4.2
Cooling Requirements
Note –
In the Enterprise system, all boards must be adjacent to a PCM. The fans in
the PCM cool the boards. The minimum configuration is one PCM for every two
adjacent boards.
The power supplies incorporate redundant bulk fan electrical power so that the fans
continue to operate in a failed power supply with the redundant fan power from the
peripheral power supply.
TABLE 7-3
Minimum and Redundant Working Power Supplies Required to Power
Active Boards
Enterprise 5500/4500 Systems
Enterprise 6500 System
Number
of Boards
Minimum Working Power
Supplies
Redundant Working Power
Supplies (Hot-pluggable)
Minimum Working
Power Supplies
Redundant Working Power
Supplies (Hot-pluggable)
1-2
1
2
1
2
3-4
2
3
2
3
5-6
3
4
3
4
7-8
3 + peripheral supply
1
1. System needs a fourth PCM for cooling purposes.
4 + peripheral supply
4
5
9-10
5
6
11-12
6
7
13-14
7
8
15-16
7
2
2. System needs an eighth PCM for cooling purposes.
8
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