RJ-45 Connector Pin Assignments A-3

10BASE-T Specifications

The 10BASE-T name indicates a signaling speed of
10 Mbps and twisted-pair wiring. Base stands for
baseband, which denotes a technique for transmitting
signals as direct-current pulses rather than modulating
them onto separate carrier frequencies.
A wiring topology using 10BASE-T specifies a wiring hub,
cable arranged in a star configuration, and unshielded
twisted-pair cable. Each node has a separate cable run that
must not exceed 100 meters (328 ft) from the node to
the hub.
RJ-45 Connector Pin Assignments
Figure A-1 shows the RJ-45 connector pin assignments for
the 3C900B NIC.
Figure A-1 RJ-45 Connector Pin Assignments
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1
2
3
4
5
6
7
8
TD+
TD_
RD_
RD+