SMC Networks TIGERSWITCH SMC8648T - Manual (Page 58)

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 or
1000 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.
Table B-1. 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin MDI-X Assignment MDI Assignment
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
Note: The “+” and “-” signs represent the polarity of the wires that
make up each wire pair.