Mdi And Mdi-X Devices - Bay Networks BayStack350T User Manual

Using the BayStack Model 350T 10/100 Autosense Switch
Table B-1
Table B-1.
Pin
1
2
3
4
5
6
7
8

MDI and MDI-X Devices

Media Dependent Interface (MDI) is the IEEE standard for the interface to
unshielded twisted pair (UTP) cable.
For communications to take place between two devices, the transmitter of one
device must connect to the receiver of the other device. The connection must be
achieved through a crossover function, which could 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).
Note: For the transmitter of one device to connect to the receiver of another
device, the sum of crossovers must always be an odd number.
The following sections describe the use of straight-through and crossover cables
for connecting MDI and MDI-X type devices.
B-2
shows the RJ-45 (8-pin modular) port connector pin assignments.
RJ-45 port connector pin assignments
Signal
RX+
RX–
TX+
Not applicable
Not applicable
TX–
Not applicable
Not applicable
Description
Receive Data +
Receive Data –
Transmit Data +
Terminated
Terminated
Transmit Data –
Terminated
Terminated
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