Solved

Way to connect up redundant power cords of a pair of stacked Cisco C3750X switch

Posted on 2012-03-16
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Last Modified: 2012-03-19
Refer to attached photo :

a) the pair of cables on the left is the 'stackwise' cables :
    did I connect them up correctly?

b) the pair of cables on the right : what are these?  Are
    they for redundant power?   Did I connect them up
    correctly?
Ciscable2.jpg
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Question by:sunhux
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giltjr earned 500 total points
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A) Yes.

B) They are for power, but it can either be redundant or sharing mode.

Go to:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6406/data_sheet_c78-584733.html

and search on "Cisco StackPower Technology"
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by:sunhux
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For (B), I don't quite understand why these cables are needed.
If these 2 cables are unplugged/taken out, the switches will still
have power, right?

In fact there are 2 external (13A) power cords connected to
each of the switch, so I was wondering why the cables for (B)
is still needed?
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Author Comment

by:sunhux
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Is item (B)  PoE (Power over Ethernet) & what does PoE do?
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by:giltjr
giltjr earned 500 total points
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They can be used in case the power supplies in one of the switches dies.

With these cables in place you don't need to have a 2nd power supply for each switch in the stack.


B is used for "power", does not matter if it is POE or just plain power to power the switch.

POE is away to supply power to devices over Ethernet cables.  This is normally used for VOIP phones and cameras.
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