Hardware Description
6
Manual Documentation Number EIR418-2SFP-T – 0109m
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Ports
RJ-45 ports:
Eight RJ-45 ports auto-sense for 10, 100 Mbps while two ports auto-sense for
10, 100 or 1000 Mbps device connections. The auto MDI/MDIX feature allows
connections to switches, workstation and other equipment without changing straight
through or crossover cabling. The charts below show the cable pin assignments for
straight through and crossover cables.
•
RJ-45 Pin Assignments
Pin Number
Assignment
1 Tx+
2 Tx-
3 Rx+
6 Rx-
Note
“+” and “-” signs represent the polarity of wire pair.
All copper ports on the EIR418-2SFP-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-)
