B&B Electronics EIR505-XX RJ-45 Pin Assignments Pin Number, Pin MDI-X Signal Name MDI Signal Name

RJ-45 Pin Assignments

Pin Number	Assignment
1	Tx+
2	Tx-
3	Rx+
6	Rx-

All ports on this switch support automatic MDI/MDI-X operation. Straight-through cables can be used for all network connections. 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. 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

Manual Documentation Number: EIR505-xx_5107m 7

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