B&B Electronics EIR405-T - Manual - Manual (Page 10)

Hardware Description
7 Manual Documentation Number EIR405-T – 0912m
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 RJ-45 Pin Assignments
Pin Number Assignment
1 Tx+
2 Tx-
3 Rx+
6 Rx-
Note
“+” and “-” signs represent the polarity of each wire pair.
All ports on the EIR405-T support automatic MDI/MDI-X operation, you can use
straight-through cables (See Figure below) for all network connections to PCs or servers,
or to other switches or hubs. In straight-through cables, 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.
The table below shows the 10BASE-T / 100BASE-TX MDI and MDI-X port pin outs.
Pin MDI-X Signal Name MDI Signal Name
1 Receive Data plus (RD+) Transmit Data plus (TD+)
2 Receive Data minus (RD-) Transmit Data minus (TD-)
3 Transmit Data plus (TD+) Receive Data plus (RD+)
6 Transmit Data minus (TD-) Receive Data minus (RD-)
Straight Through Cable Schematic