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NIC Specifications
July 1998 D-1
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Appendix D NIC SpeciÞcations
D.1 RJ-45 Connector
RJ-45 pinouts are shown below.
¥ Pin 1: Transmit data +
¥ Pin 2: Transmit data -
¥ Pin 3: Receive data +
¥ Pin 6: Receive data -
Rx/Tx Crossover Cable
If you want a direct RJ45 (10/100BaseT) connection from a single
computer to a printer, use a mini-hub and two network cables. We do not
recommend using an Rx/Tx crossover cable to defeat the need for a hub
because it is a custom cable that may not be available from a local dealer
or distributor. A crossover cable that is not clearly labeled can also cause
problems if mixed with standard RJ45 network cables.
If needed, you can build an Rx/Tx Crossover cable by using a standard
RJ45 cable and swapping the Transmit (1, 2) and Receive (3, 6) signal
pairs at one end.
IMPORTANT: You must use the proper RJ45 connector/cable tools;
otherwise, the cable may be unreliable.
Clearly label a custom cable so you do not confuse it with
standard RJ45 cables.
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