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AP 55 POE Question

Chris Yue

I am looking to rollout some AP55s and have come across a strange situation.

Our CISCO (2960S) switches are rated sufficient to support the power requirements of the AP.

Sure enough, when patched in, I got a green blinking light.

I then left it unplugged for a couple of days and when I patched this in again in the same location, I got no light.

Once I attached a POE injector, the AP came to life.

After a few hours, I removed the injector and patched it back to the same cable and now all is well.

It is almost as if need a charge boost of some sort.

Just wanted to know if anyone has come accross this before and if anyone can recommend a 12volt power supply that will work for the AP55 as Sophos does not sell any directly.

 



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    HI Chris, 

    You may as well install POE- compliant Switches in your network is you have several AP and wish to use them without using POE adapter on each site. or you may use a POE adapter when required .

    It would occur that the device would consume 11W to 13 W of power and practically this is possible on POE compliant switches. But there is a Downside, Power Dissipates by using a Long Cable and the loss in between  say 10% approx on Copper . To be a specific check the loss you may calculate P (rated)=VI(Rated)-VI(loss) , where P(rated) is the power output from the Switch and P(actual) is the power output from the other end of the cable. 

    I would advise POE+ Compliant Switches which would deliver 24W output and as POE would deliver 14.5W. (Without loss (rated value)).

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  • 0

    HI Chris, 

    You may as well install POE- compliant Switches in your network is you have several AP and wish to use them without using POE adapter on each site. or you may use a POE adapter when required .

    It would occur that the device would consume 11W to 13 W of power and practically this is possible on POE compliant switches. But there is a Downside, Power Dissipates by using a Long Cable and the loss in between  say 10% approx on Copper . To be a specific check the loss you may calculate P (rated)=VI(Rated)-VI(loss) , where P(rated) is the power output from the Switch and P(actual) is the power output from the other end of the cable. 

    I would advise POE+ Compliant Switches which would deliver 24W output and as POE would deliver 14.5W. (Without loss (rated value)).

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