10Base-T/100Base-Tx Pin Assignments; Table B-1 10/100Base-Tx Mdi And Mdi-X Port Pinouts - LevelOne GSW-1676 User Manual

C
ABLES

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 the switch, you can use either
straight-through or crossover cable.

Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin
1
2
3
6
4,5,7,8
Note: The "+" and "-" signs represent the polarity of the wires that
make up each wire pair.
B-2
MDI Signal Name
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Receive Data plus (RD+)
Receive Data minus (RD-)
Not used
MDI-X Signal Name
Receive Data plus (RD+)
Receive Data minus (RD-)
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Not used