16 Chapter 3
Foreign Voltage
Pattern
If the TelephonyModem detects a foreign voltage on one or more telephone
lines, it repeats the following sequence:
•All LEDs on
•The LED corresponding to the telephonyline(s) with foreign voltage
If you see this sequence, immediately disconnect the affected lines and elimi-
nate the voltage source. Common sources of foreign voltage include:
•connection to incumbent telephone service
•shorted wires
•defective CPE
Note:All telephonylines must be physically disconnected from incumbent
service before connecting the lines to the TelephonyModem. Cancellation of
incumbent service is not sufficient.
Touchstone® TelephonyRelease 6 Standard 1.0 December 2008
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