SMC Networks VDSL2 - Manual (Page 66)

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)
All RJ-45 ports on this switch 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
this switch, you can use either straight-through or crossover cable.
Note: Auto-negotiation must be enabled for automatic MDI/MDI-X
pinout configuration.
Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin MDI Signal Name MDI-X Signal Name
1 Transmit Data plus (TD+) Receive Data plus (RD+)
2 Transmit Data minus (TD-) Receive Data minus (RD-)
3 Receive Data plus (RD+) Transmit Data plus (TD+)
6 Receive Data minus (RD-) Transmit Data minus (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.