Solved: Power Injector vs. Local Power Supply

paul_erion · ‎03-09-2009

In supplying electrical power to an AP (either 1252 or 1140), does a power injector have any advantage over a local power supply -- other than the electrical outlet does not need to be nearby? Does the power injector have any disadvantages when compared to a local power supply?

Thanks,

Paul

jeff.kish · ‎03-09-2009

Right, the primary advantage is that a power outlet is not required next to every AP. You can also turn off an AP by shutting down the switchport, you can have flexibility in moving APs around, etc...

As far as AP functionality is concerned, there are no advantages/disadvantages to using either one. Both provide full power to the AP.

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jeff.kish · ‎03-09-2009

Right, the primary advantage is that a power outlet is not required next to every AP. You can also turn off an AP by shutting down the switchport, you can have flexibility in moving APs around, etc...

As far as AP functionality is concerned, there are no advantages/disadvantages to using either one. Both provide full power to the AP.

paul_erion · ‎03-09-2009

Thanks for the reply, it's appreciated!

Oh, and I just stumbled across the Cisco document "Next-Generation Wireless Power Options"

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps10092/at_a_glance_c45-504087.pdf

that talks about power injectors and supplies.

Lucas Phelps · ‎03-13-2009

I agree,

The power injectors are just a little less cumbersome, they can inject power up to 300 feet. So if you are not sure where your access point will get the best coverage, it is hard to have outlets hardwired in 85 different locations as you test your AP in different spots.

However the injector allows you to do that.

As far as price is concerned, the injector is maybe $75 more than the supply.

-Luke