Cat 6500: why 42 V input for all modules

[whoknowswhat86]

Hi Expert,

I am trying to understand the power efficiency of Catalyst 6500 and I can see that all modules and cards take 42 V on input for all IO Modules, Sups, PFCs and DFCs Cards. I don't think such implementation is power efficient enough as you need multiple DC-DC converters on the Modules and Cards. Am I missing the point? Any comments?

regards

alex

[htarra]

The below link may be helpful in calculating the heat dissipation in catalyst 6500 switch also gives other power efficiency related information.

http://bock-bock.cisco.com/~hodgdon/Power/Power%20FAQ.htm#Heat_Dissipati

We use an efficiency of 80% for Catalyst 6500 calculations.