uNifi POE, which wires in cat5e cable?

[Thedog]

Did networking at a place where I had to use a very thing wire to get into some pipes. I also used uNifi accespoints that comes with poe-injector. The cable I used is used for network jacks rather than rj45 contacts but in this case I had to use contacts (ceiling mount).

When I had "contacted" two cables and tested them only 6 of the 8 conductors worked (5 and 6 did not work, suppose that's green and white/blue) however the access points worked fine (both the actual network traffic as well as the power from the poe-injector).

It might be something with the cable that the tester doesn't report as I find it strange that two cables should have the same non-working conductors. Or does unifi POE only require 6 conductors?

 

[Markverhyden]

POE requires all 4 pairs, 1-2 and 3-6 are for data. POE requires the other pair, 4-5 and 7-8, for a power and ground. What I have found is some AP's require 12vdc and others require 24vdc. At least for Ubiquity. Not sure what you mean by 5 and 6 but they are not related. Revisit how the wiring has been done. You should have 568b with all 4 pairs all the way through.

http://www.practicallynetworked.com/img/568b.jpg

 

[Thedog]

POE requires all 4 pairs, 1-2 and 3-6 are for data. POE requires the other pair, 4-5 and 7-8, for a power and ground. What I have found is some AP's require 12vdc and others require 24vdc. At least for Ubiquity. Not sure what you mean by 5 and 6 but they are not related. Revisit how the wiring has been done. You should have 568b with all 4 pairs all the way through.

http://www.practicallynetworked.com/img/568b.jpg

Yes exactly, and when I used a testing tool I got no signal on 5 & 6... but the Unifi still works. Guess it's a problem with my testing tool then?

 

[Markverhyden]

What kind of testing tool are you using?

 

[Thedog]

What kind of testing tool are you using?

Just a simple tester like http://www.satworld.ie/images/detailed/0/network-cable-tester.jpg

 

[Thedog]

The actual lights is of course working on the tester if I use a fabric-made cable, but figured that maybe in my cable the signal is somehow "so low" that the detector doesn't detect it but an actual computer / access point will.

 

[Markverhyden]

Just a simple tester like http://www.satworld.ie/images/detailed/0/network-cable-tester.jpg

That's what I figured. To be honest those are not very useful. They are basically just a simple continuity tester. If you had a cable tester that actually looked at the pairs you would have seen two pairs down, 3-6, 4-5 and the system would not be working. So something else is going on. If you are going to provide quality network services you might want to think about getting something more robust that provides more information.

A better device will give you an accurate approximation of how far away a cable fault is amongst other things. You can spend much more money of course but something like the below will help improve your work a lot.

http://www.monoprice.com/product?c_id=105&cp_id=10524&cs_id=1052401&p_id=8128&seq=1&format=2

 

[Thedog]

That's what I figured. To be honest those are not very useful. They are basically just a simple continuity tester. If you had a cable tester that actually looked at the pairs you would have seen two pairs down, 3-6, 4-5 and the system would not be working. So something else is going on. If you are going to provide quality network services you might want to think about getting something more robust that provides more information.

A better device will give you an accurate approximation of how far away a cable fault is amongst other things. You can spend much more money of course but something like the below will help improve your work a lot.

http://www.monoprice.com/product?c_id=105&cp_id=10524&cs_id=1052401&p_id=8128&seq=1&format=2

Thanks, don't want to do much "cabling" but I usually use the tool in a ready-made network just to know which cables goes where or to test a cable if I need to cut it off and put on a new contact or something.

Although what I really would like is to be able to track a wire in a wall to see where it does, I have one of these http://www.kjell.com/se/image/Product_213553sv/full/1 I know they are used for finding a cable in the other end but I need something where I can track the actual cable, how it's wired. Like a metal detector that would only go for "my cable"

 

[Markverhyden]

Thanks, don't want to do much "cabling" but I usually use the tool in a ready-made network just to know which cables goes where or to test a cable if I need to cut it off and put on a new contact or something.

Although what I really would like is to be able to track a wire in a wall to see where it does, I have one of these http://www.kjell.com/se/image/Product_213553sv/full/1 I know they are used for finding a cable in the other end but I need something where I can track the actual cable, how it's wired. Like a metal detector that would only go for "my cable"

It great to use for those basic tests. The toner and probe you have is also great to use. You can use it find a cable in a bundle but you should add ABN test clips. ABN = Angled Bed of Nails. It allows you to penetrate the insulation without completely stripping the wire. I've had those toners not work. So I've stripped off the out insulation and used a better tester. When you have the right cable you will see shorts/cross overs. You might be able to get the same results using your tester since the remote is just a passive loopback device. Picture below of an example. Of course you need to make sure the line is not energized. LOL!!!