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DucDigital
Asked: 2009-11-26 19:09:11 +0800 CST

Cat5e cable: what are each color used for?

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I have been curious on this for a while since there are some people who use a modified CAT5e cable with a switch to disconnect data sending without actually disconnecting the whole internet connection.

For the above statement: I will explain further: they cut the green wire inside the CAT5e cable, attach a switch and from there they can just simply switch on and off without actually disconnecting.

Can someone explain what colors correspond to what functions in Cat5e?

If so I would be very appreciative. Thank you very much!

color

2 Answers

  1. Best Answer

    SEMI-DUPLEX:
    1. TX+: Simplex (Transmit), positive
    2. TX-: Simplex (Transmit), negative
    3. RX+: Simplex (Receive), positive
    6. RX-: Simplex (Receive), negative

    FULL DUPLEX:

    1. TX_D1+: Simplex (Transmit), positive
    2. TX_D1-: Simplex (Transmit), negative
    3. RX_D2+: Simplex (Receive), positive
    4. RX_D2-: Simplex (Receive), negative
    5. BI_D3+: Duplex channel 1, positive
    6. BI_D3-: Duplex channel 1, negative
    7. BI_D4+: Duplex channel 2, positive
    8. BI_D4-: Duplex channel 2, negative
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  2. It depends on the wiring scheme. This table is copied from the Wikipedia page for TIA/EIA-568-B:

    alt text http://netstrata.com/images/T568.png

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