Solved: Enhanced PoE on 3750E/3560E - on how many ports?

ov · ‎09-03-2008

On a 48port variant of the above switches, how many ports will be able to deliver full power to our AP-1250's ?

andrew.butterworth · ‎09-03-2008

In the 12.2(44)SE release notes for the 3750-E/3560-E it states that all 10/100/1000 PoE ports can provide Enhanced PoE up to 20-Watts per port. I assume like earlier 3560/3750's its just a simple maths calculation -

48-port 3750-E/4560-E with single PSU can provide up to 370-watts so you would get a maximum of 18 ports providing 20-Watts. With the dual PSU versions they can provide up to 740-Watts so you would get 36 ports providing 20-Watts.

There is a presentation slide here that states with a 24-port 3750-E/3560-E you will be able to power 20 1250's and a 48-port one will power up to 40. Only the 48-port 3750-E/3560-E's can have dual PSU's (Full Power) so this ties in. If you work the maths out it means each AP actually requests and gets 18.4-Watts:

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/80211n_Cisco_Intel_Roadshow_Final_01_16_08.pdf

HTH

Andy

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View solution in original post

Mark Yeates · ‎09-03-2008

Ole,

The following switch models will be able to provide provide 15.4W PoE power to all 48 ports on your switch.

3560E-48PD-F

3750E-48PD-F

HTH,

Mark

ov · ‎09-03-2008

Thank you for the answer, but i'm talking about enhanced PoE. To power up the Cisco 1250 ap's via ethernet, i need approx 17-18 watts pr port. Enhanced PoE does support this on these switches, but i cant find out if it will manage to deliver on all 48 ports at the same time.

Anyone who can point me in the right direction on this?

andrew.butterworth · ‎09-03-2008