100Base-Tx Operation; Rj-45 Connector Pin Assignments - 3Com 3C905C-TX-M User Manual

84 A
PPENDIX

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 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

The following illustration shows the RJ-45 connector pin
assignments for the EtherLink PCI NICs.
A: S
PECIFICATIONS AND
A data rate of 100 Mbps.
A broadcast architecture.
A specific media-access control (MAC) scheme.
T X D
A T A
A C T
1 0
L
N
1 0 0
K
C R
ABLING EQUIREMENTS
1 TD+
TD _
2
3 RD+
4
5
RD _
6
7
8
1 2 3 4 5 6 7 8