User Manual

Twisted-Pair Cable Assignments
Appendix B
Trapeze MP-620 Installation Guide
44
Figure 13. Pin Numbering on RJ-45 Connector
10/100BASE-TX Pin Assignments
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45
connections: 100-ohm Category 3 or better cable for 10 Mbps connections, or
100-ohm Category 5 or better cable for 100 Mbps connections. Also be sure
that
the length of any twisted-pair connection does not exceed 100 meters (328 feet).
The RJ-45 Input port on the power injector is wired with MDI pinouts. This
means that you must use crossover cables for connections to PCs or servers, and
straight-through cable for connections to switches or hubs. However, when
connecting to devices that support automatic MDI/MDI-X pinout configuration,
you can use either straight-through or crossover cable.
Table 9. 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin MDI-X Signal Name MDI Signal Name
1 Receive Data plus (RD+) Transmit Data plus (TD+)
2 Receive Data minus (RD-) Transmit Data minus
(TD-)
3 Transmit Data plus (TD+) Receive Data plus (RD+)
6 Transmit Data minus (TD-) Receive Data minus
(RD-)
4,5,7,
8
Not used Not used
Note: The “+” and “-” signs represent the polarity of the wires
that make up each wire pair.
1
8
8
1