Filter
Top Products
Port and Cable Assignments
15
Port and Cable Assignments
RJ-45 Port Description
RJ-45 station ports (MDI-X) can be attached to
any devices that use a standard network
interface (e.g., a workstation, server, bridge or
router). RJ-45 daisy-chain ports (MDI) can be
cascaded to a station port on similar
networking devices (e.g., another switch or hub). Use unshielded twisted-pair (UTP)
or shielded twisted-pair (STP) cable for RJ-45 connections: 100-ohm Category 3, 4
or 5 cable for 10 Mbps connections or 100-ohm Category 5 cable for 100 Mbps
connections. Also be sure
that the length of any twisted-pair connection does not
exceed 100 meters (328 feet).
Straight-Through Wiring
If the twisted-pair cable is to join two ports and only one of the ports has an internal
crossover (MDI-X), the two pairs of wires must be straight-through.
Crossover Wiring
If the twisted-pair cable is to join two ports and either both ports are labeled with an
“X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be
implemented in the wiring.
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
Straight-Through RJ-45 Pin Assignments
End 1 End 2
1 (RD+) 1 (TD+)
2 (RD-) 2 (TD-)
3 (TD+) 3 (RD+)
6 (TD-) 6 (RD-)
Crossover RJ-45 Pin Assignments
End 1 End 2
1 (TD+) 3 (RD+)
2 (TD-) 6 (RD-)
3 (RD+) 1 (TD+)
6 (RD-) 2 (TD-)