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5
UTP Port Requirements
The RJ-45 connectors for the 10BASE-T ports accept standard unshielded twisted pair (UTP) cable
and are wired as MDI-X ports to connect end stations without using crossover cables. Use 100-ohm
Category 5 UTP cable with RJ-45 plugs on each end of the UTP cable.
T
able 3 shows the pin assignments for 10BASE-T UTP ports in the standard MDI-X configuration.
Figure
4 shows the pin assignments for a 10BASE-T Ethernet UTP crossover cable used to connect an
Ethernet hub directly to the EtherSpeed module.
Figure 4. 10BASE-T Ethernet UTP crossover cable pin assignments
Table 3. 10BASE-T MDI-X port pin assignments
RJ-45 connector port
(8-pin modular)
Pin # MDI-X ports
1 Receive data +
2 Receive data –
3 Transmit data+
4 Not used
5 Not used
6 Transmit data –
7 Not used
8 Not used
4026
1 2 3 4 5 6 7 8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
TD+
TD-
RD+
Unused
Unused
RD-
Unused
Unused
TD+
TD-
RD+
Unused
Unused
RD-
Unused
Unused
6740.1
893-00994-A Page 5 Tuesday, April 29, 1997 5:55 PM