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Tonda
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CRS112-8P-4S-IN and PoE limits using both power inputs

Mon Oct 31, 2022 12:10 pm

Hello,
I would like to ask about the PoE limits of CRS112-8P-4S-IN when both power inputs are used and a mix of Low PoE and High PoE devices is used. In the specification there is: Max total out (A): 2.8A (18V-28V) & 1.4A (48V-57V) A
If I would use both power inputs simultaneously and would connect both Low and High PoE devices to the same CRS112, so I would be able to use a total of 2,8A for Low PoE devices PLUS a total of 1,4A for High PoE devices?
Also, there is max power consumption limited to 160W. Does it mean, that a mix of Low PoE and High PoE devices must not exceed this limit?
 
mkx
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Re: CRS112-8P-4S-IN and PoE limits using both power inputs

Mon Oct 31, 2022 8:14 pm

Simple math: 2.8Ax28V=78.4W (almost 80W) ... similarly 1.4Ax57V=79.8W (almost 80W). Total almost 160W.

The hard limit is actually current - per port and sum over low/high voltage branch. Wattage limits are secondary, i.e. if using 48V power adapter, the high-voltage power limit drops to 67W as 1.4A limit remains.

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