Utp port requirements – Nortel Networks 10BASE-T User Manual
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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.
shows the pin assignments for 10BASE-T UTP ports in the standard MDI-X configuration.
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