CABLES
10/100BASE-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).
Data and PoE power are delivered on the standard two wire pairs (pins 1, 2, 3, and 6). Since 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-X and MDI Port Pinouts
Pin | MDI Signal Name | MDI-X Signal Name |
1 | Receive Data plus (RD+) | Transmit Data plus (TD+) |
| and GND (Positive Vport) | and -48V feeding power |
| | (Negative Vport) |
2 | Receive Data minus (RD-) and | Transmit Data minus (TD-) |
| and GND (Positive Vport) | and -48V feeding power |
| | (Negative Vport) |
3 | Transmit Data plus (TD+) | Receive Data plus (RD+) |
| and -48V feeding power | and GND (Positive Vport) |
| (Negative Vport) | |
6 | Transmit Data minus (TD-) | Receive Data minus (RD-) |
| and -48V feeding power | and GND (Positive Vport) |
| (Negative Vport) | |
4, 5, 7, 8 | Not used | Not used |
Note: The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
