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Transition Networks
SI-IES-1200-LRT User Manual
33586 Rev. D
https://www.transition.com
Page
10
of
21
RJ-45 Pin Assignments
The UTP/STP ports will automatically sense for Fast Ethernet (10Base-T/100Base-TX) or Gigabit
Ethernet (10Base-T/100Base-TX/1000Base-T) connection.
Auto MDI/MDIX means that the port can connect to another switch or workstation without changing
straight through or crossover cabling. See the figures below for straight through and crossover cable
schema.
10/100Base-TX Pinouts
Pin Number
Assignment
1
Tx+
2
Tx-
3
Rx+
6
Rx-
Note: the “
+
” and “
-
” signs represent the polarity of the wires that make up each wire pair.
The table below shows the 10Base-T/100Base-TX MDI and MDI-X port pinouts.
Pin Number
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+)
4
Transmit Data minus (TD-)
Receive Data minus (RD-)