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New Member

3750x PoE Power Supply Question

Looking at the specs for the 3750 power supply - is the WS-C3750X-48P-S model with the 715W power supply referring to the amount for both power supplies per switch or just one power supply per switch? Meaning, is the 715 a accumulative number or, just the watts of one power supply. I would like to purchase a 3750x PoE switch with redundant power supplies. If this model is not the correct one, could you please give me the model that offers 48 port PoE with redundant power supplies?

Thanks, Pat

Everyone's tags (3)
2 ACCEPTED SOLUTIONS

Accepted Solutions
Gold

Re: 3750x PoE Power Supply Question

Hi Pat,

the spec u read about 3750X is with One default AC power supply, 715W (435W PoE power). you could order a backup power supply and install it anytime for redundancy.

EDIT:

available power supply Part #: C3KX-PWR-715WAC  (435W PoE power)   AND   C3KX-PWR-1100WAC  (800W PoE power)

Hope it Helps,

Soroush.

Hope it Helps, Soroush.
VIP Super Bronze

3750x PoE Power Supply Question

Pat,

Since you device is POE, if you need redundancy you second power supply should be 715w.  Also, these power supplies don't work in combined mode, so you have one working and the other one is on stand-by.  So, your UPS can be based on one PSU (715w).  Just don't forget to connect the second PSU to your UPS.

HTH

6 REPLIES
Gold

Re: 3750x PoE Power Supply Question

Hi Pat,

the spec u read about 3750X is with One default AC power supply, 715W (435W PoE power). you could order a backup power supply and install it anytime for redundancy.

EDIT:

available power supply Part #: C3KX-PWR-715WAC  (435W PoE power)   AND   C3KX-PWR-1100WAC  (800W PoE power)

Hope it Helps,

Soroush.

Hope it Helps, Soroush.
New Member

3750x PoE Power Supply Question

Thanks for the response. So that model  provides one power supply but, I have the option to add another later.

If I add another, should I base my UPS backup one 1500W?

Thanks, Pat.

VIP Super Bronze

3750x PoE Power Supply Question

Pat,

Since you device is POE, if you need redundancy you second power supply should be 715w.  Also, these power supplies don't work in combined mode, so you have one working and the other one is on stand-by.  So, your UPS can be based on one PSU (715w).  Just don't forget to connect the second PSU to your UPS.

HTH

Gold

Re: 3750x PoE Power Supply Question

Anytime!

for UPS power calculation you must consider the amount of power that the PoE devices receive from the switch.

C3750X has the capability to feed 30W PoE power per port and in certain configurations you can achieve that, and that'd need a 2200W at its Max.

PS: i edited my previous post with different PS choices u have, in case u need 30W PoE for 48 ports, u r gonna need two C3KX-PWR-1100WAC or a combination of 1100W and 715W Minimum.

Hope it Helps,

Soroush.

Hope it Helps, Soroush.
New Member

3750x PoE Power Supply Question

Or is only one PS active at a time and basing my backup on 750 would be good?

Thanks, Pat.

Gold

3750x PoE Power Supply Question

Take a look at Table 8 :

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

HTH,

Soroush.

Hope it Helps, Soroush.
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