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In Cat 5 cable based on fast ethernet (100 mbsp) 4 are used to Send and Receive. The other 4 wires are unused. All 8 wires are used for gigabit communications.

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Q: Why are there 8 wires in an Ethernet cable?
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How do you Enable Ethernet and telephone to be transmitted over the same Cat 5 cable?

Ethernet network traffic on a cat 5 cable only uses 4 wires of the 8 in the cable. Telephone voice transmission only uses 2 wires. Therefore, you can take any 2 of the unused network wires (pins 4 or 5, 7 or 8) and use it for voice. You would then have both data and voice transmission in the same cable.


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How many wires are needed for a PC to successfully send data to and receive data from another PC using an ethernet LAN cable with rj 45 connectors?

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How do you do ethernet connection?

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