Thanks a lot Giuseppe!

"a power supply can provide up to 100W at a given voltage level "

I just quoted you above for easy reference.

It means power supply acts as variable power supply with max power =100 watt.

if there is one module in switch , requiring 10 watt, then power supply 10 watt, as we increase the load 1.e number of modules. power supply changes its output accordingly.

Say we add one more module which requires 10 watt, now the power supplly will supply 20 watt . But it can provide up to 100 watt at maximum.

Am I correct ?

Thanks a lot Giuseppe!

I was going through the link on 4500' power supplies,forwarded by Edison.

I find 4500 switch supports two types of power supplies:

1) fixed wattage

2) variable wattage.

If 4500 switch uses fixed wattage power supply,we need to make sure the total consumption= power supply's wattage.

If fixed power supply' output=100 watt, and we have only one module which requires only 10 watt, then module will get toasted ,as power supply is providing fixed constant wattage .

Am i correct?

thanks a lot!

Just one more question about redundant mode in 6500 switch

Let quote from the link

"When running in Redundant Mode, each power supply provides approximately 50% of its capacity to the chassis."

I am little confused about" 50 percent of its capacity" phrase in the excerpt.

Let say i have power supplies with max output given below:

p1=100 watt

p2=100 watt

Load on switch=50 watt.

Would p1 and p2 supply 50%of their total capacity i.e

p1=50

p2=50,

if yes, the combined output is way too much than load on switch p1+P2>load or 100> 50.

OR

p1 will supply 50 % of total load wattage i.e p1=25 watts

p2 ill supply 50%of total load wattage=25,

thanks a lot!