TWISTED-PAIR CABLE AND PIN ASSIGNMENTS
10BASE-T/100BASE-TX Pin Assignments
8
8
11
Figure B-1. RJ-45 Connector Pin Numbers
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 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.
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.
