78
www.cooperbussmann.com/wirelessresources
Cooper Bussmann 5073E-T Managed Ethernet Switch User Manual
Rev Version 1.1
a
ppENDIx
a - rJ-45 pIN aSSIGNMENT
The UTP/STP ports will automatically detect fast Ethernet (10Base-T/100Base-TXconnections), or Gigabit Ethernet
(10Base-T/100Base-TX/1000Base-T connections). Auto MDI/MDIX means that the switch can connect to another
switch or workstation without changing straight-through or crossover cabling. See the figures in this appendix for
straight through and crossover cable schematics.
10 /100BASE-TX Pinouts
With a 10/100BASE-TX cable, pins 1 and 2 are used for transmitting data, and pins 3 and 6 are used for receiving
data.
RJ-45 Pin Assignments
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 following table shows the 10/100BASE-TX MDI and MDI-X port pin outs.
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+)
6
Transmit Data minus (TD-)
Receive Data minus (RD-)
10/100Base-TX Cable Schematic
Figure 87 and Figure 88 show the 10/100Base-TX cable schematic.
Figure 87 Straight-through Cable Schematic
Figure 88 Crossover Cable Schematic
