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SHM-B ASYNC
3. Check the path of your four-wire circuit for potential
sources of interference (fluorescent lighting,
electrical motors, etc.). Such sources of electrical
“noise” can provide an environment in which
unwanted signals are induced onto your four-wire
circuit. Also, check to see if an adjacent four-wire
cable carrying a separate data stream is creating
“crosstalk.” It may be that the data signal is jumping
from the adjacent cable onto the four-wire circuit
between the two SHM-B modems (another type of
induced signal).
• 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.
• 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.