10/100Base-Tx Pin Assignments; Straight-Through Wiring; Table B-1. 10/100Base-Tx Mdi And Mdi-X Port Pinouts; Figure B-2. Straight-Through Wiring - Enterasys Matrix-V V2H124-24FX Hardware Installation Manual

B
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).
The RJ-45 module ports 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 an RJ-45 module port, you can use either straight-through or
crossover cable.
1
2
3
6
4,5,7,8
Note: The "+" and "-" signs represent the polarity of the wires that make
up each wire pair.

Straight-Through Wiring

If the twisted-pair cable is to join two ports and only one of the ports has an internal
crossover (MDI-X), the two pairs of wires must be straight-through. (When
auto-negotiation is enabled for an RJ-45 module port, you can use either
straight-through or crossover cable to connect to any device type.)
End A
B-2

Table B-1. 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin MDI Signal Name
Transmit Data plus (TD+)
Transmit Data minus (TD-) Receive Data minus (RD-)
Receive Data plus (RD+)
Receive Data minus (RD-)
Not used
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
White/Orange Stripe
White/Green Stripe
1
2
3
4
5
6
7
8

Figure B-2. Straight-through Wiring

MDI-X Signal Name
Receive Data plus (RD+)
Transmit Data plus (TD+)
Transmit Data minus (TD-)
Not used
Orange
Green
1
2
End B
3
4
5
6
7
8