B&B Electronics EIR618-2SFP-T - Manual User Manual
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Manual Documentation Number: EIR618-2SFP-T_4812m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
RJ-45 Pin Assignments
Pin Number
Assignment
1
Tx+
2
Tx-
3
Rx+
6
Rx-
Note
“+” and “-” signs represent the polarity of the wires that make up
each wire pair.
All ports on this industrial switch support automatic MDI/MDI-X operation,
user 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 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 following table shows the 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
Cross Over Cable Schematic