Wiring a CAT-5e cable for voice and data uses the telecommunications industry association (TIA)/electronic industries alliance (EIA) 568 A standards. In an RJ-45 jack, pins 1, 2, 3 and 6 are used for a local area network (LAN )connection. Pins 4 and 5 are used for voice.
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When using CAT-5e for data and voice, the pins are wired as follows: Pins 1 and 2 are for receiving data and pins 3 and 6 for transmitting data. That leaves four more pins for voice and power-over-Ethernet (POE). Usually, pins 4 and 5 are used for voice. Pin 4 is for transmitting and Pin 5 for receiving. POE pins 7 and 8 are used for positive and negative power connections.
Data Color Code
For data, pins 1, 2, 3 and 6 are wired according to the 568A standard. On a CAT-5e, pin 1 uses the white-green wire for receiving "RecvData +", and pin 2 uses the green wire for "RecvData -". Pin 3 uses the orange and white striped wire for transmitting "TxData +" and the orange wire on pin 6 for transmitting "TxData -".
Voice Color Code
For voice, only two wires are needed: one to send voice and the other to receive it. The striped blue wire is used for voice receiving, and the solid blue wire on a CAT-5e cable is used for transmitting.
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