21
CHAPTER 6: Troubleshooting
4. While you are checking your cable for sources
of noise and crosstalk, check the cable for
irregularities in the shield. Also, reconsider
the cable’s ratings for attenuation, capacitance,
and impedance. You may need to install a
higher-quality cable for your particular
installation.
5. Your AC power source may be the culprit.
Check your AC power at the wall socket and
confirm that it is within the range given in
Chapter 1
.
6. Check the settings for jumpers W3 and W4 to
ensure that you have selected the A-B positions
unless you are connected to an ME800 unit.
SYMPTOM: TD or RD indicator is steadily on with no data
attempting to pass (no DTEs attached).
Check for reversal of polarity on the four-wire
connection.
