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Cat 5 Wiring Existing - Shared with PBX

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by kimscomputing

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I am attempting to install a network at a business in which the cat 5 wiring exists to each office ext. However the phone system runs on the blue and blue/white wires. Currently the fax/data line runs on the orange and orange/white wires. The business owner is positive that the phone co. told him it will work to network the remaining wires. Is this true? Does a network only use two pairs. Or do I have to take over all the wires. Thanks for your help.

4 replies

by ann777

It's possible to wire analog telephone line to one pair of wires... however, color is less important than position. Make sure the transmit wire and the receive wire, is continuous on both ends, and yes... the telephone line will work (provided itis analog and not digital) with just two of the wires. Yes, a standard network ethernet uses two pairs... positions 1,2,3,& 6.

by ann777

So positions 4, 5, 7 & 8 are open. You can attach another computer, or two analog telephones (just make sure that the transmit/receive are appropriately connected on both sides and they do not reverse).

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