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Antaira Technologies - Industrial Ethernet Switches
LMX-1002G-SFP Series Hardware Manual V1.3
2.6
Ethernet Ports
RJ-45 Ports
RJ-45 Ports (Auto MDI/MDIX): The RJ-45 ports are auto-sensing for 10Base-T, 100Base-TX, or
1000Base-T connections. Auto MDI/MDIX means that the switch can connect to another switch or
workstation without changing the straight-through or crossover cabling. See the figures below for
straight-through and crossover cabling schematics.
RJ-45 Pin Assignments
Pin Number
Assignment
1
Rx+
2
Rx-
3
Tx+
6
Tx-
Table 2.3 - RJ45 Pin Assignments
Note:
The “+” and “-” signs represent the polarity of the wires that make up each wire pair.
All ports on this industrial Ethernet switch support automatic MDI/MDI-X operations. Users can
use straight-through cables (see figure below) for all network connections to PCs, servers, and
other switches or hubs. With straight-through cabling, pins 1, 2, 3, and 6 are at one end of the
cable and are connected straight through to pins 1, 2, 3 and 6 at the other end of the cable. The
table below (Table 2.3) shows the 10BASE-T/100BASE-TX/1000BASE-T 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-)
Table 2.4 - Ethernet Signal Pin
The following figures show the cabling schematics for straight-through and crossover.
Figure 2.5
Crossover Cable Schematic
7
Figure 2.4
Straight-Through Cable Schematic