Table B-1 10/100Base-Tx Mdi And Mdi-X Port Pinouts - SMC Networks SMC TigerAccess SMC7824M/ESW Installation 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, 4 or 5 cable for 10 Mbps
connections or 100-ohm Category 5 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 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
1
2
3
6
4,5,7,8
Note: The "+" and "-" signs represent the polarity of the wires that
make up each wire pair.
Note: Auto-negotiation must be enabled for automatic MDI/MDI-X
pinout configuration.
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