3Com NBX Manual page 143

Important Safety Instructions 143
Radio Interference
Radio interference may occasionally cause buzzing and humming in your
3Com Cordless Telephone handset, or clicking noises in the base unit.
This interference is caused by external sources such as a TV, refrigerator,
vacuum cleaner, fluorescent lighting, computer equipment, or electrical
storm.
Your unit is NOT DEFECTIVE. If these noises continue and are too
distracting, please check to see what appliances may be causing the
problem. In addition, we recommend that the Base not be plugged into a
circuit that also powers a major appliance, because of the potential for
interference. Also be certain that the antenna on the unit is fully
extended when needed.
In the unlikely event that you consistently hear other voices or distracting
transmissions on your phone, you may be receiving radio signals from
another 3Com Cordless Telephone or another source of interference. If
you cannot eliminate this type of interference, you need to change to a
different channel.
Finally, some telephones operate at frequencies that may cause
interference to nearby TVs and VCRs. To minimize or prevent such
interference, the base of the 3Com Cordless Telephone should not be
placed near or on top of a TV or VCR. If interference is experienced,
moving the 3Com Cordless Telephone farther away from the TV or VCR
often reduces or eliminates the interference.
Privacy
3Com Cordless Telephones are radio devices. Communications between
the handset and base unit are accomplished by means of radio waves
which are broadcasted over the open airways. Because of the inherent
physical properties of radio waves, your communications can be received
by radio receiving devices other than your own 3Com Cordless Telephone
unit. Consequently, any communications using your 3Com Cordless
Telephone might not be private.