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72 APPENDIX A: SPECIFICATIONS AND CABLING REQUIREMENTS
100BASE-TX Operation
100BASE-TX is the IEEE 802.3u standard for Fast Ethernet
signaling over Category 5 UTP or STP wire at 100 Mbps.
Based on an extension to the IEEE 802.3 Ethernet
specification, Fast Ethernet characteristics include:
■ A data rate of 100 Mbps.
■ A broadcast architecture.
■ A specific media-access control (MAC) scheme.
A wiring topology using 100BASE-TX specifies a wiring
hub, cable arranged in a star configuration, and Category 5
UTP or STP wiring. 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 14 shows the RJ-45 connector pin assignments for
the 3C905C NIC.
Figure 14 RJ-45 Connector Pin Assignments
TX DATA
ACT
10
100
L
N
K
12345678
1
2
3
4
5
6
7
8
TD+
TD
_
RD
_
RD+
book Page 72 Monday, March 15, 1999 1:31 PM