4510 power supplies

Unanswered Question

We are replacing our old 4006 with a 4510RE.

5 blades of 10/100/1000

1 SPF blade with 6 gbic


One vendor is quoting dual 2800W p/s and the other is quoting 1100W p/s.

The "2800" vendor is saying that if we put in 1100's, if one fails the other doesn't have the power to run the switch.

Based on the above config, is he correct?

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Overall Rating: 4 (2 ratings)
Jon Marshall Wed, 09/16/2009 - 13:31
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In addition to Giuseppe's post, if you have a login to CCO then you can use the Cisco power calculator -


this tool allows you to select your chassis type/supervisor and line cards and then shows you how much power that will use.

Be aware that the 4500 power supplies can run in combined or redundant mode -

1) combined = power is drawn from both power supplies to power the chassis and linecards. Obviously if one of the power supplies fails and the total amount of power needed is more than the remaining power supply can supply then linecards will start to shut down.

2) redundant = power is only drawn from one power supply and that power supply can supply all the power needed for the chassis and linecards. If that power supply fails then the other one can take over with no lose of service.


Giuseppe Larosa Wed, 09/16/2009 - 12:20
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Hello Paul,

the following link provides information about power consumption of the different modules.



you haven't specified the supervisor model and if the modules are normal or E type.

267 W used by 4510RE chassis and fans

WS-X4648-RJ45V-E 123W per module


347 W

this sums to

1229 W

so it is possible that a 1100W is not enough.

It is dependent on what type of supervisor and linecards you are looking for


I see that the second vendor is suggesting 1400W PS.

Hope to help



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