4-26 Keysight N5221A/22A Service Guide
Troubleshooting
Rear Panel Troubleshooting
4-
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.
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
pin 3 on the other end of the cable.
b. Connect the wire from pin 3 on one end of the cable to the wire from
pin 1 on the other end of the cable.
c. Connect the wire from pin 2 on one end of the cable to the wire from
pin 6 on the
other end of the cable.
d. Connect the wire from pin 6 on one end of the cable to the wire from
pin 2 on the
other end of the cable.
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.
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 Table 4-3. If your cable does not use this color
scheme, you will have to determine the locations of the appropriate wires
before proceeding with this procedure.
Table 4-3 LAN Pin Definitions and Wire Color Codes
Pin Number Color Pin Number Color
1 (transmit +) White/orange 5 White/blue
2 (transmit −) Orange 6 (receive −) Green
3 (receive +) White/green 7 White/brown
4Blue8Brown
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