Antaira Industrial Ethernet Switches
LMP-0501 Series User Manual V1.0
7
2.5 Ethernet Ports
RJ-45 Ports
RJ-45 Ports (Auto MDI/MDIX)
: The RJ-45 ports are auto-sensing for 10Base-T, 100Base-TX
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 as below for straight-
through and crossover cabling schematics.
RJ-45 Pin Assignments
(Table 2.2)
Pin Number
Assignment
1
Rx+
2
Rx-
3
Tx+
6
Tx-
All ports on this industrial Ethernet switch support automatic MDI/MDI-X operation. Users can
use straight-through cables (see figure below) for all network connections to PCs, servers, other
switches or hubs. With 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
(
Table 2.3
) shows the 10BASE-T, 100BASE-TX MDI and MDI-X port pin outs.
The following figures show the cabling schematics for straight-through and crossover.
2.6
Note
“+” and “-” signs represent the polarity of the wires that make up each wire pair.
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 2.2 - RJ45 Pin Assignments
Table 2.3 - Ethernet Signal Pin Outs
Figure 2.4
– Straight-through Cable Schematic
Figure 2.5
– Crossover Cable Schematic
