Port and Cable Assignments
9
Port and Cable Assignments
RJ-45 Port Description
RJ-45 station ports (all port) can be attached to any devices which use a standard
network interface (e.g., a workstation, server, bridge or router). RJ-45 daisy-chain
ports (all port) 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).
Schematics for both straight and crossover twisted-pair cable are shown below
Pin
Assignment
(Station Ports)
Assignment
(Daisy-Chain Port)
1
Input Receive Data +
Output Transmit
Data +
2
Input Receive Data -
Output Transmit
Data -
3
Output Transmit
Data +
Input Receive Data +
6
Output Transmit
Data -
Input Receive Data -
4,5,7,
8
Not Used
Not Used
Straight-Through
Crossover
(Switch) (Adapter)
(Switch) (Hub/Switch)
1 IRD+
1 OTD+ 1 IRD+
1 IRD+
2 IRD-
2 OTD- 2 IRD-
2 IRD-
3 OTD+
3 IRD+ 3 OTD+
3 OTD+
6 OTD-
6 IRD- 6 OTD-
6 OTD-
