Power over Ethernet with two APs

Cedrik · 08-29-2004

I currently have a network setup with two aps. The first ap (befw11s4) is connected via network cable to a switch in an office. The second ap (wap11) is acting as a repeater to the first ap via the wireless connection. I plan on connecting these to aps together with a network cable. The problem i'm running into is that i need to have both of these aps hidden above the ceiling, or at least out of site without any power cords hanging down from the ceiling. The way i understand POE is that it will apply power to the first ap, but what i need to a way to gey power to both aps with only using one POE adapter or by some other means. Is there any way i can get power to the second ap without having to have it connected to a power outlet?

Thorn · 08-29-2004

Quote:

Originally Posted by Cedrik

I currently have a network setup with two aps. The first ap (befw11s4) is connected via network cable to a switch in an office. The second ap (wap11) is acting as a repeater to the first ap via the wireless connection. I plan on connecting these to aps together with a network cable. The problem i'm running into is that i need to have both of these aps hidden above the ceiling, or at least out of site without any power cords hanging down from the ceiling. The way i understand POE is that it will apply power to the first ap, but what i need to a way to gey power to both aps with only using one POE adapter or by some other means. Is there any way i can get power to the second ap without having to have it connected to a power outlet?

Yes.

But... (You knew one was coming, didn't you?) You'll have to split out the power to two power cables at the PoE splitter, and the power input into the combiner will have to be enough to compensate for the drop over the Ethernet and both devices.

You could also put another combiner/splitter pair past the first AP to power the second AP.

This is all assuming that the both devices are at the same voltage level (give or take a volt or two), and are both the same current type (AC or DC.) If either of those things differs, you'll have to come up with another plan.

Cedrik · 08-29-2004

so i'll need to make up an adapter similiar to the one on this site to accomplish this then.

hxxp://www.nycwireless.net/poe/

Thorn · 08-29-2004

Quote:

Originally Posted by Cedrik

so i'll need to make up an adapter similiar to the one on this site to accomplish this then.

hxxp://www.nycwireless.net/poe/

Yes. And it's http.

wrzwaldo · 08-29-2004

Both devices you listed are DC (at least mine are). The problem is the WAP11 is 5VDC and the BEFW11S4 is 12 VDC. So you will need two power sources or put 12VDC on the line an stick a DC-to-DC converter in front of the WAP11.

Xcusme · 08-30-2004

Well, there is another way...instead of using 2 seperate power supplies. You could tap the 12VDC power supply line, insert a 7805 voltage regulator and have 5VDC to the WAP11. I would place the voltage regulator at the WAP11. Any voltage drop thru the Cat5 , depending the distance, would more than likely still leave 7VDC or more to power the 7805 for the WAP11. I don't have the current draw figure for a WAP11, but if memory serves, a 7805 will source 1500ma with a proper heatsink.

wrzwaldo · 08-30-2004

Quote:

Originally Posted by Xcusme

Well, there is another way...instead of using 2 seperate power supplies. You could tap the 12VDC power supply line, insert a 7805 voltage regulator and have 5VDC to the WAP11. I would place the voltage regulator at the WAP11. Any voltage drop thru the Cat5 , depending the distance, would more than likely still leave 7VDC or more to power the 7805 for the WAP11. I don't have the current draw figure for a WAP11, but if memory serves, a 7805 will source 1500ma with a proper heatsink.

See my original post.

Xcusme · 08-30-2004

Wrzwaldo

Jaeessus H. Christ, how in the hell did I miss that...your right!

Sorry for the redundant post.

Cedrik · 08-30-2004

Quote:

Originally Posted by Xcusme

Well, there is another way...instead of using 2 seperate power supplies. You could tap the 12VDC power supply line, insert a 7805 voltage regulator and have 5VDC to the WAP11. I would place the voltage regulator at the WAP11. Any voltage drop thru the Cat5 , depending the distance, would more than likely still leave 7VDC or more to power the 7805 for the WAP11. I don't have the current draw figure for a WAP11, but if memory serves, a 7805 will source 1500ma with a proper heatsink.

The distance between the two aps would only be like 50 to 75 feet at the very most. I can almost cover the entire area with one ap, but there are a few places that the signal is weak so i need two aps to do the job.

08-29-2004	#1 (permalink)
Cedrik Registered Member Join Date: Jul 2003 Posts: 4	Power over Ethernet with two APs I currently have a network setup with two aps. The first ap (befw11s4) is connected via network cable to a switch in an office. The second ap (wap11) is acting as a repeater to the first ap via the wireless connection. I plan on connecting these to aps together with a network cable. The problem i'm running into is that i need to have both of these aps hidden above the ceiling, or at least out of site without any power cords hanging down from the ceiling. The way i understand POE is that it will apply power to the first ap, but what i need to a way to gey power to both aps with only using one POE adapter or by some other means. Is there any way i can get power to the second ap without having to have it connected to a power outlet?

08-29-2004	#5 (permalink)
wrzwaldo I amuse you? Join Date: Dec 2003 Posts: 9,147	Both devices you listed are DC (at least mine are). The problem is the WAP11 is 5VDC and the BEFW11S4 is 12 VDC. So you will need two power sources or put 12VDC on the line an stick a DC-to-DC converter in front of the WAP11. Last edited by wrzwaldo : 08-30-2004 at 07:20 AM.

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08-29-2004	#3 (permalink)
Cedrik Registered Member Join Date: Jul 2003 Posts: 4	so i'll need to make up an adapter similiar to the one on this site to accomplish this then. hxxp://www.nycwireless.net/poe/

08-30-2004	#6 (permalink)
Xcusme Registered Member Join Date: Sep 2003 Posts: 23	Well, there is another way...instead of using 2 seperate power supplies. You could tap the 12VDC power supply line, insert a 7805 voltage regulator and have 5VDC to the WAP11. I would place the voltage regulator at the WAP11. Any voltage drop thru the Cat5 , depending the distance, would more than likely still leave 7VDC or more to power the 7805 for the WAP11. I don't have the current draw figure for a WAP11, but if memory serves, a 7805 will source 1500ma with a proper heatsink.

08-30-2004	#8 (permalink)
Xcusme Registered Member Join Date: Sep 2003 Posts: 23	Wrzwaldo Jaeessus H. Christ, how in the hell did I miss that...your right! Sorry for the redundant post.