C
ABLES
B-2
10BASE-T/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 ports on the switch base unit support automatic MDI/MDI-X
operation, so you can use straight-through cables for all network
connections to PCs or servers, or to other switches or hubs. In
straight-through cable, pins 1, 2, 3, and 6, at one end of the cable, are
connected straight through to pins 1, 2, 3, and 6 at the other end of the
cable. When using any RJ-45 port on these switches, you can use either
straight-through or crossover cable.
Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin
MDI Assignment
MDI-X Assignment
1
Output Transmit Data +
Input Receive Data +
2
Output Transmit Data -
Input Receive Data -
3
Input Receive Data +
Output Transmit Data +
6
Input Receive Data -
Output Transmit Data -
4,5,7,8
Not used
Not used
Note:
The “+” and “-” signs represent the polarity of the wires that
make up each wire pair.
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