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Topic # 111250 28-Oct-2012 16:15 Send private message

I've replaced a couple of runs of Cat 6 in my place with some Cat 6 shielded cable due to some interference I was getting from a few power cables in the wall.

I have previously used the Cat 6 Rj-45 plugs with inserts which are fairly easy to use.

I have found though that the shielded cable is too fat to fit into the inserts. 

Does anyone know where to get some RJ-45 plugs to use for shielded cable, i only need 4 so don't really want a hole packet.

Cables Direct seem to have them for Cat 6 solid shielded cable but they also state they can't be used with the Dynamix Cat 6 solid shielded cable so it's a bit confusing.

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  Reply # 707992 28-Oct-2012 16:59 Send private message

You could grab some Ubiquiti tough cable connectors from go wireless. Usually when you run shielded cable it is terminated on shielded patch panels with shielded jacks at the wall. What made you decide the power was interfering with the data?
I have only come across this once and it was in a food processing plant where some mong had run cat 5 (not even cat 5e) through the same duct as a couple of 32A power cables. Was getting wicked packet loss even at 100Mb and wondered why they couldn't get gigabit to work through it.



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  Reply # 708010 28-Oct-2012 17:39 Send private message

chevrolux: You could grab some Ubiquiti tough cable connectors from go wireless. Usually when you run shielded cable it is terminated on shielded patch panels with shielded jacks at the wall. What made you decide the power was interfering with the data?
I have only come across this once and it was in a food processing plant where some mong had run cat 5 (not even cat 5e) through the same duct as a couple of 32A power cables. Was getting wicked packet loss even at 100Mb and wondered why they couldn't get gigabit to work through it.


It is definately getting interference from the power side of things as every time someone turned a light on or off the picture was lost.

I have two other sets of hdmi extenders running fine through the house, this is the only one I had problems with.

I know that there are power wires running horizontally through the wall where the cat 6 runs go up so I am assuming this is where the problem lies.

I have gone ahead and used the rj45 plugs I have and although I am getting the all clear when I use my cable testers I cannot get any signal through the hdmi extender. I am hoping that it is just the plugs I have used and perhaps some of the cables ends are touching?

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  Reply # 708100 28-Oct-2012 20:24 Send private message

Oh right so it isn't running ethernet but hdmi. Makes sense I guess so won't question it.
So continuity is good but no picture through it? Hmm, definitely cleared all the shielding out of the plug? And what about the drain wire? What have you done with that? And how is it being grounded? Don't have a heap of experience with shielded cable. Like I said, normally we would terminate it on a shielded patch panel and and ground it at that end and then just terminate it on a shielded jack. I have used the ubiquiti cable and plugs that go with it. Grounding gets done by the PoE injector in their case. What kind of grounding do your hdmi extenders give?

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  Reply # 708586 29-Oct-2012 17:53 Send private message

Do you know how close the Cat 6 is to the power cables?

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  Reply # 708604 29-Oct-2012 18:20 Send private message

You'll need shielded RJ45 plugs on the ends of the cables and also the HDMI extenders will need have shielded sockets for the shielding to have any effect.

Does you tester test the shielding/ground as well?






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  Reply # 708669 29-Oct-2012 20:23 Send private message

Thanks for the replies.

No idea how close the cat 6 was to the power lines but it would have crossed over at some point although it would have been at 90 degrees.

I haven't got as far as earthing anything yet. I am assuming that as long as the RJ45 plugs are in place the hdmi extender should work anyway, regardless of grounding the cables. It's only when lights were turned on/off I thought there may be problems if no grounding had been completed.

The inserts and RJ45 plugs I used were too thin to accept the individual strands with the plastic insulation intact. What I did was strip back each of the 8 wires and run the bare copper into the insert up to the point of the plastic insulation. I then trimmed the ends and crimped them into a RJ45. What I did notice was the ends of the wires were touching in places so I used a sharp tool to space them out a bit before crimping but it is entirely possible that they made contact again after being crimped into the plug.

I would have thought though that this may have shown up when I used my cable testers which gave both cables the all clear.


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  Reply # 708791 29-Oct-2012 22:47 Send private message

If you haven't grounded the drain the shielding isn't doing a thing. What have you done though, stripping this insulation, sounds a bit agricultural but in theory should work. If a cable tester shows continuity through all pairs then supposedly the cable is fine. If you are serious about using shielded stuff I would say go and get some shielded jacks and put them on the ends then just use patch leads from the jacks to the hdmi balun.

EditL Dynamix do affordable shielded jacks that aren't too bad to use.

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  Reply # 711935 4-Nov-2012 22:03 Send private message

Yeah wires are going to touch if you just try to crimp bare wires. 90deg crossing of power lines has minimal interferance, thats they way we are supposed to do it, so probably something running parallel to a source of interferance somewhere. Not earthing the sheilding will still be better than no sheilding, but try to crimp the drain wire to something at one end only. Make a nice RJ45 outlet on the wall so that you don't have to crimp any plugs in the first place, because jacks/sockets are the best way to terminate solid cable ? permanent installation type of cable should have a permanent outlet.

It does sound like you used Cat5e plugs that are not designed for the thicker Cat6 cable? Also worth checking that you were used solid plugs instead of stranded...




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