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TP Cable Recommendations for Ethernet Communication
It is vital that your Ethernet cable be the correct cable type and that it be properly terminated with the correct
pinout. Ethernet links use Category (CAT) 3, 5e, or CAT 6, unshielded twisted pair (UTP) or shielded twisted pair
(STP) cables, terminated with RJ-45 connectors. Ethernet cables are limited to a length of 330 feet (100 meters).
The cable can be terminated as either a patch cable or a crossover cable (see figure 5) and must be properly
terminated for the application:
•
Patch (straight-through) cable — Connection of the device to an Ethernet hub, router, or switch that also
hosts a controlling computer.
•
Crossover cable — Direct connection between the switcher and a controlling computer.
Pins:
1 2 3 4 5 6 7 8
Insert Twisted
Pair Wires
RJ-45
Connector
Figure 5.
RJ-45 Pin Assignment for Ethernet Communication
Over TP and Remote RS-232 Control Wiring
Use a female 9-pin D connector to bare wire RS-232 cable or a universal control cable (UC50' or UC100') to
connect your computer or control system to the OVER TP or REMOTE port (see figure 6 to wire this 3-pole
connector).
Figure 6.
Remote RS-232 Wiring
1. Wire the unterminated end of the RS-232 cable to the three pins of the 3-pole captive screw connector as
described below. Connect the transmit, receive, and ground wires of the cable to the three pins on the
connector, starting at the left:
•
Connect the transmit wire to pin 1 which plugs into the Rx (receiver) port.
•
Connect the receive wire to pin 2 which plugs into the Tx (transmit) port.
•
Connect the ground wire to pin 3 which plugs into the G (ground) port.
2. Plug the 3-pole connector into the OVER TP or REMOTE port on the rear panel of the device.
3. Connect the other end of the cable to the appropriate computer or control system port.
Crossover Cable
(for direct connection to a PC)
End 1
End 2
Pin
Wire Color
Pin
Wire Color
1
white-orange
1
white-green
2
orange
2
green
3
white-green
3
white-orange
4
blue
4
blue
5
white-blue
5
white-blue
6
green
6
orange
7
white-brown
7
white-brown
8
brown
8
brown
T568B
T568A
A cable that is wired as TIA/EIA T568A at one
end and T568B at the other (Tx and Rx pairs
reversed) is a "crossover" cable.
Do not tin the wires!
Straight-through Cable
(for connection to a switch, hub, or router)
End 1
End 2
Pin
Wire Color
Pin
Wire Color
1
white-orange
1
white-orange
2
orange
2
orange
3
white-green
3
white-green
4
blue
4
blue
5
white-blue
5
white-blue
6
green
6
green
7
white-brown
7
white-brown
8
brown
8
brown
T568B
T568B
A cable wired the same at both ends is called
a "straight-through" cable because no pin/pair
assignments are swapped.
Ground (G)
Receive (Rx)
Transmit (Tx)
DTP3 T 203 • Installation
8
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