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Splitting CatV cable

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by bonnys13

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My non-profit is expanding to a building that is physically separated from our current office, which contains the DSL and phone connections. Our landlord ran CatV cable to every room in the new office building - he wants to split the outlet in each office to work both data and phone. My question is: how will this effect the DSL speed and respone? My understanding is that splitting the cabel 6 pairs for data and two pairs for phone will slow the internet down. Is this true?

5 replies

by oz_media

Impossible it will not work.

thyis can't be done, my main client is an interconnect telephone company, after reading your question I called the network cabling guru they use and he says it can't be done. You can split DATA or Boice cabling but not one for both data and voice.
You will need four pair wiring for data, even with ADSl, and four pair for voice. Th eKSU will NOT ring the phone if the pairs are split.

THIS CAN'T BE DONE.
Such a bold statement? Now go prove me wrong.

THE ONLY WAY thie will work m is if you use resisential phones on a residential POTS system (even then, it's iffy) and not proprietary Key Service Units.

by oz_media

The CISCO IP phones merely emulate IP and run over your network connection instead of true VoIP. This doesn't work with MOST Data/Voice combinations. NEC also makes a less expensive VoIP emulator in the IPK PBX.

I can almost guarantee that in this case, the user has a standard POTS KSU with Digital line cards at best, most probably analogue line cards.

by cactus pete

The data on a CAT5 cable needs all of the lines to function with a NIC. So you can't just take two away for POTS and expect things to work...

However, if you're considering IP telephones, like Cisco 7960 series or something, then the phone itself works a little like a hub, and has two ports on the back. One goes to the wall, and the other lets you PC plug in there, so they share the line.

Your internet connection won't be slow, as you still need to switch over from IP to whatever the phone company has brought to your building.

by rcom

When answering questions we have to carefully read what the person wrote.

In this case she said 6 pairs for data and 2 pairs for phones? That's 16 seperate wires. So in response to the daring person that said it won't work, pay closer attention.

Cat5 cable has 8 wires (4 pairs). So if he actually told you "pairs" that would mean that he ran 2 Cat5 cables to each drop. No problem, there would be absolutely no effect on the DSL or internet speed.

To transmit(TX) and recieve(RX) data only 4 wires are used. The only time all 8 wires are used is to cascade from one device to another or to directly connect 2 PCs together.

Ethernet 10/100 Base-T crossover cable
TX+ to RX+, TX- to RX-

Ethernet 10/100 Base-T straight cable
TX+ to TX-, RX- to RX-

The network connection uses 4 pairs (8 wires). But as mentioned only 4 of the 8 are used to transmit data. So he's saying that the extra wires will be used for phone lines. Either way this would have no effect on the "SPEED" of the internet. Cheap way of doing things but will work. Not sure about electronic interference but will work.

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