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, 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 this switch, you can use either straight-through or crossover cable.
Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin MDI Signal Name MDI-X Signal Name
1 Transmit Data (TD+) Receive Data (RD+)
2 Transmit Data (TD-) Receive Data (RD-)
3
Receive Data (RD+) Transmit Data (TD+)
6
Receive Data (RD-) Transmit Data (TD-)
4,5,7,8
Not used Not used
Note: The “+” and “-” signs represent the polarity of the wires that
make up each wire pair.
