Do's and Don'ts of Cable Routing (Part 2)



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Nathan Gatt

Hi there,

somewhat related to the above, I have a video door phone (intercom) system that runs CAT5e cabling in between the different stations (doorbell, master monitor, slave monitor) and the CAT5e cable is used to transmit power from the MASTER monitor to the other stations. I had passed CAT5e cabling for data networks and telephone through a 25mm PVC typesconduit and had also passed the above CAT5e cable for the intercom system in the same conduit (this is before I knew that the power was transmitted over this cable).

Since the video door phone is transmitting 18V (eighteen) to power up the other stations, do you think it is safe to leave them as-is (i.e. in the same conduit) or will I suffer degradation of service in my data networks and/or telephone.

I havent yet tested this as I am still working on the house - but any help is appreciated.



Can someone please explain to me what exactly is a "Home-Run"? I'm not sure I understand what it is for and how to actually do it. Please be as detailed as possible in your description.

Also, I have decided to run ethernet cabling all througout my house and am planning the entire project by myself. I am not a certified "Network Engineer" (YET) but I have a lot of knowledge on how to go about doing this. My house is already built, so this is probably going to be the most difficult part; trying to figure out how to actually run the cables through the walls. I plan to have an ethernet wall jack in every room of my house (there are a total of 5 rooms). I WOULD GREATLY APPRECIATE ANY ADVICE YOU CAN GIVE ME ON CABLING!

Thank you very much,

-Hrag Melkonian



Also keep cables away from florescent lights and heat sourcses (such as incandescent lights). Florescent lights emit a lot of EM which can corrupt data and excessive heat is just not good for the cables (slower speeds, corrupted data).

When hanging cables make sure the bundle is supported every 4 to 6 feet. Too much sag causes the cable to stretch and deform which can damage the charateristics of it (slower speeds, corrupted data)

Make sure cables will stay dry and not get wet.(slower speeds, corrupted data).

One thing that is easily overlooked: put your wall jacks near wall power outlet. You're going to need a power source for for that PC, TV, and wireless phone/answering machine aren't you?
Seperate the power outlet and communications outlet with a stud between 'em.

I was a professional telecomunications cabler for 15 years. Any problems or questions let me know.



Just a heads up using the STP, it's kind of a pain in the but to terminate. But if you have to run parallel to the power, then it's the best way to go. (Some inspectors may not like it though) and there is usually a ground in the cable too (at least on when I've worked with it). If you're going to work with cat6, make sure you have room in your boxes/mudrings. It's not as forgiving as cat5e. And where you can get away with some sharp angles (greater than 80 degrees) with cat5, cat6 will fail a TDR test. cable ends have to be straight at both ends of the terminations (jack and Patch Panel). Use Velcro when possible for dressing in cat6. (all points if the cable run).



Those hyper links are great. I've yet to figure out how to work the strings into my media network, but I think the island would work fine. I've never tried to hang cable with those trusses. I think it would be all right as long as they are inside the walls.



Thanks for noticing the links. I was beginning to think it was a waste of time. :-)



I talked to my networking contractor about using Cat6, but he recommended Cat5e. It's a little cheaper, and that cable will still enable me to set up a gigabit Ethernet network.

If I thought anyone would ever run fiber to my curb, I would have given more consideration to using Cat6. As it stands, my new home is in a rural area outside the city limits. I don't think anyone will be running fiber there any time soon.


Michael Brown Executive Editor


Darth Ninja

I'm also interested in Cat 6 - wouldn't it's shielding cancel out any interference?



Thanks for this article. I'm about to do the same in my "new to me" new house. I'll take any advice I can get.

Was there a reason you didn't go with Cat6?



I've seen where running UTP next to power has caused major problems and it took forever to find. I think I would have requested STP to ensure no interference. It's harder to terminate, but you can run it next to almost anything.



CAT-5 cable can be run parallel to power lines though, a good couple of feet away is always nice. The interference should be canceled-out from the twisted pairs. Or, at least that's what cisco taught me :p.

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