- Ethernet Cat 5 cables have eight wires (four pairs).
- But under 10BaseT and 100BaseT standards (10 Mbps and 100 Mbps, respectively) only four (two pairs) of these wires are actually used.
- One pair is used for transmitting data and the other pair is used for receiving data.
- Cat5 cables can be work on either "straight-through" or "crossover."
Straight-through
- In a "straight-through" set-up for both plugs and sockets, pins 1 and 2 are used to transmit signals and pins 3 and 6 are for receiving signals.
- This wiring set-up is used for connecting computers to other network devices such as hubs or switches.
Crossover
- In a "crossover" set-up the assignations are reversed so that the transmitting plug pins connect to the receiving socket pins.
- This is used for connecting computers directly with one another.
- Cat 5 cable sockets can also be set up for internal crossover to receive "straight-through" cables.
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