Let say we have a Modular switch.I just make up the values to make my point.
The power supply out put= 100 watt
The total consumption in switch=70 watt
So what will happen to rest of 30 watt? Where did it go?
thanks a lot!
you probably have answered to this with your own posts in the other thread
let's keep it simple:
a combined chassis cannot stay with a single working Power supply
If you insert a single power supply and then set the switch to combined mode, the switch displays this error message:
Insufficient power supplies present for specified configuration.
a redundant yes
So the threshold is lower for redundant design: to be able to provide the power needed in case of failure of the other supply no more then 50% of max power can be used by chassis+linecards+POE (if used)
with combined the threshold is higher 83% but if one power supply fails something like a linecard has to be powered down
Hope to help
When using fixed wattage you don't need to match the switch power consumption exactly to the power input. What you do need to do is make sure that the power supply wattage is greater than the switch configuration needs.
So if the switch needs 10watts and your power supply is 100watts that doesn't mean the module in the switch will be fried, it will still only get 10Watts. It just means the switch draws 100watts from the power supply whether it needs it or not.
Variable power supplies only draw what they need.
yes from a practical point of view it is so
Hope to help