Keysight Technologies N5224/5A Service Manual page 100

Troubleshooting
Rear Panel Troubleshooting
Constructing a Crossover Cable
A crossover cable can be made from a standard LAN cable by connecting pin 1
from each connector to pin 3 of the other connector, and pin 2 from each
connector to pin 6 of the other connector.
1. Strip away a few inches of the outside jacket insulation from the middle of
a standard LAN cable that has an RJ-45 connector on each end.
Pins 1, 2, 3, and 6 of the connectors must be located to determine which
wires to cut in the following steps. Most, but not all, LAN cables use the
color coding listed in
scheme, you will have to determine the locations of the appropriate wires
before proceeding with this procedure.
Table 4-3
Pin Number
1 (transmit +)
2 (transmit −)
3 (receive +)
4
2. Cut the wires going to pins 1, 2, 3, and 6. Strip away a small amount of
insulation from each of the eight cut ends.
a. Connect the wire from pin 1 on one end of the cable to the wire from
b. Connect the wire from pin 3 on one end of the cable to the wire from
c. Connect the wire from pin 2 on one end of the cable to the wire from
d. Connect the wire from pin 6 on one end of the cable to the wire from
3. Insulate all exposed wires so that they cannot short together.
4. Label this as a crossover cable so that it cannot be confused with a
standard cable.
4-24
Table 4-3. If your cable does not use this color
LAN Pin Definitions and Wire Color Codes
Color
White/orange
Orange
White/green
Blue
pin 3 on the other end of the cable.
pin 1 on the other end of the cable.
pin 6 on the
other end of the cable.
pin 2 on the
other end of the cable.
Pin Number Color
5 White/blue
6 (receive −) Green
7 White/brown
8 Brown
Keysight N5224A/25A Service Guide