[Compay]

Connecting Two Workstations Without a Hub
100BASE-T uses a star topology. This means a hub or concentrator is in the center of a star, and each workstation or server is connected to this hub.

For test purposes, you can directly connect two workstations or a workstation and a server without using a hub. This setup requires a special cable incorporating the crossover function described earlier in this document. The tables below show which wires need to be crossed over.


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100BASE-TX crossover cable diagram

Function Pin# Pin# Function
TX+ 1 <-----------> 3 RX+
TX- 2 <-----------> 6 RX-
RX+ 3 <-----------> 1 TX+
RX- 6 <-----------> 2 TX-

(This is an MDI-X, or crossover, cable)
The receive data pair (the two wires designated RD) must be a twisted pair, and the transmit data pair (designated TD) must be a twisted pair.


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