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Ethernet 100BaseTX and 10BaseT Cable Specifications and Guidelines

If you don't have to make Ethernet cables that often like me, when the time comes to make them I usually consult another reference just to double-check my memory. So, in those cases, this entry should help clear up those foggy memories.

Generally speaking, unless you are connecting workstations to other workstations, or routers to other routers, or hub/switches to other hub/switches you'll want a "straight-through" cable. This implies that the colored wires are in the same sequence on both ends of the cable.

What Cable Do I Need?

 

Hub

Switch

Router

Workstation

Hub

Crossover

Crossover

Straight

Straight

Switch

Crossover

Crossover

Straight

Straight

Router

Straight

Straight

Crossover

Crossover

Workstation

Straight

Straight

Crossover

Crossover

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Crossover cables have the transmit and receive pins on the ends of the cables connected so that they are "crossed".

Crossover quick tip: Pin 1 to 3, and Pin 6 to 2.

Much more detail here.

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