[c-nsp] electric consumption

[Justin Shore]

Ian,

I would find this to be of great interest.  It would be nice to have a 
single concise (or not so concise) location for all power-related specs 
across the entire Cisco product line for both AC and DC.  I'm moving an 
ISP to a different location in a building in the very near future.  I'm 
dumping all our remaining AC PSUs (all that I technically can) and 
switching to DC.  I have found that the product data sheets often don't 
have this data or the data is obscure and hard to find.  I often have to 
refer to install guides to find this info.  In many cases the data 
sheet, install guide, and the sticker on the PSU don't agree on the max 
consumption.  I would love to have a complete power guide for all of 
Cisco's products.  It would also be helpful to know the average load so 
that I have a feel for what I can get by with temporarily in a pinch.

On a slightly different topic I'd like to see Cisco compose a Power Best 
Practices document.  I'd like to have something to fall back on when I 
tell a customer to use 220v on their 6500 even though they can squeak by 
with the quad-110v plugs based on their immediate load.  I'd like to be 
able to graphically show a customer why a RPS isn't the silver bullet 
they think it is.  I'd like to be able to show a enterprise customer why 
they need per-row power distribution cabinets instead of attempting to 
pull individual drops from a standard wall-mount panel.  Best practice 
documentation on power redundancy for large chassis (do we really need 
A, B, and C power sources for a PWR-4000DC on a 7600?).  There are a 
plethora of power documentation that Cisco could put together that would 
greatly benefit all of us.  So, could you have that ready next week?  :-)

Thanks
 Justin


Ian Cox wrote:
> At 01:28 PM 2/1/2007 +0000, david.ponsdesserre at uk.bnpparibas.com wrote:
>   
>> People .
>>
>> Is there any specific command to check how much real power a cisco box is
>> "pumping" ?
>>     
>
> No there is no command that will give you how much power the device 
> is consuming, the power numbers are the worst case consumption 
> numbers at 55C, so they can be much more then typical case. The only 
> way we have gotten the actual consumption is by using external power 
> meters. I know from one measurement on a product the Datasheet number 
> to the number measured at 25C was 2x higher, with line rate traffic. 
> The variation between Dtaasheet and measured is not normally that dramatic.
>
> Question to you? Would Cisco publishing average power numbers be of interest?
>
> Ian
>
>   
>> cheers
>>
>>
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