08-24-2010 01:07 PM - edited 03-06-2019 12:38 PM
Can a WS-C3560E-24PD-S switch with a C3K-PWR-750WAC power supply, provide enough power to supply enhanced PoE of 20 watts (Power draw of access point per data sheet of model 1252 Wireless access Point with 2 radios) for all 24 ports simultaneously?
If not, how does it work? 4 ports get nothing? All ports get less power? Circuit breaker pops?
I'd appreciate it if any answer gets supported by showing calcs and/or pointing to spec sheets - as I need this information for our engineering design basis.
Thanks in advance...
08-24-2010 01:47 PM
20 x 24 = 480W.
PS is 750W.
Data sheet says:
• Enhanced PoE supporting up to 20W of PoE per port
• Industry first portfolio to scale beyond 15.4W per port delivering maximum solution simplicity for 802.11n access point deployments
It will work no problems
08-25-2010 05:14 AM
Thanks for the replies!
From the switch spec sheet in table 5 "Power Specifications" under the conditions: "100% Throughput (With Maximum Possible PoE Loads)", the measured power consumption for the switch itself is: 502 watts
Under this condition: Switch itself + 24 ports of EPoE power sourcing
502 watts + (24 * 20 watts)
502 watts + 480 watts = 982 watts
982 watts > 750 watt rating of the power supply
So what happens under these conditions?
Even for this load condition for normal PoE (15.5 watts per port) from the spec sheet Table 5 "Power Specifications" again:
Measured Power Consumption is: "502 Switch and 372 PoE Power"
372 = 15.5 * 24
So even under this condition, power consumption is (502+372) = 874 watts, which appears to be above the 750 watts available.
08-24-2010 03:11 PM
WS-C3560E-24PD-S switch with a C3K-PWR-750WAC
That should be no problem. Upgrade your IOS to 12.2(46) to enable enhanced PoE.Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
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