Installation guide

TROUBLE ON ONE TELEPHONE
Hearing
Symptom: Outside caller intermittently has trouble hearing a user.
Possible Cause
Radio-frequency interference (RFI) is
occurring.
Recommended Action
Certain early production voice terminals may be
susceptible to high RFI levels. Voice terminals
manufactured beginning April 1983 have improved
RFI immunity.
If a radio transmitter is in the area,
replace early production voice terminals with later
vintage models. Make sure the system power has a
good third-wire (green wire) ground, not a conduit
ground. Have an electrician check if necessary.
A3-5