10Base-T Specifications; Rj-45 Connector Pin Assignments - 3Com XLPCI User Manual

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
RJ-45 Connector Pin Assignments
1 TD+
TD _
2
RD+
3
4
5
RD _
6
7
8
1 2 3 4 5 6 7 8
A-3