Combined Vs Single / Redundant Power Supply

Answered Question
Mar 23rd, 2010
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I am doing the power audit for 7600 and 6500 series routers currently running in

our network.

Cisco Power Calculator recommends different types of power supplies. Some are mentioned as Combined e.g Combined WS-CAC-6000W and some are tagged as Single/Redundant. What is the basic difference between them??

As per my understanding Redundant Power Supplies can share load (50 % each) and in case of failure of one th eother takes over. And in Combined mode syatem draws power from both. And this can be done thorugh CLI. But does exaclty means Combined Vs Single/Redundant Mode power supply? Can we not configure either in one way or the other?

Correct Answer by Collin Clark about 7 years 1 month ago

Your thinking is correct. If you use two smaller PS, they will be combined, but both must be available to power the switch. If you configured them as S/R, it would power off linecards or the whole switch (if the switch would even allow the command). If you need redundant power, size the PS so each have less than 50% load.


Hope it helps.

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Correct Answer
Collin Clark Tue, 03/23/2010 - 12:58
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Your thinking is correct. If you use two smaller PS, they will be combined, but both must be available to power the switch. If you configured them as S/R, it would power off linecards or the whole switch (if the switch would even allow the command). If you need redundant power, size the PS so each have less than 50% load.


Hope it helps.

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