It can be for ground.

BurningTheSky · ‎05-26-2017

Hi,

I was wondering if anyone could help me find out what each of the wires connecting the fan to the motherboard of the switch are for? With there being more than 2 I am assuming that there is more than just a positive and negative for power?

Thanks

Julio E. Moisa · ‎05-26-2017

It can be for ground (GND)

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BurningTheSky · ‎05-28-2017

Thanks, so it could be something like:

Red - positive

Black - negative

Blue - fan speed control

Yellow - ground

Or blue and yellow the other way round?

Cisco WS-C3750G-24TS-S1U fan wiring