Technical data

Using the BayStack 350 Series 10/100 Autosense Switch
C-2
893-00992-D
Table C-1 lists the RJ-45 (8-pin modular) port connector pin assignments.
MDI and MDI-X Devices
Media dependent interface (MDI) is the IEEE standard for the interface to
unshielded twisted pair (UTP) cable.
In order for two devices to communicate, the transmitter of one device must
connect to the receiver of the other device. The connection is established through
a crossover function, which can be a crossover cable or a port that implements the
crossover function internally.
Ports that implement the crossover function internally are known as MDI-X ports,
where X refers to the crossover function.
The following sections describe the use of straight-through and crossover cables
for connecting MDI and MDI-X devices.
Table C-1. RJ-45 port connector pin assignments
Pin Signal Description
1 RX+ Receive Data +
2 RX- Receive Data -
3 TX+ Transmit Data +
4 Not applicable Not applicable
5 Not applicable Not applicable
6 TX- Transmit Data -
7 Not applicable Not applicable
8 Not applicable Not applicable
Note:
For the transmitter of one device to connect to the receiver of another
device, the total number of crossovers must always be an odd number.