Radio Interference; More Than One Cordless Telephone - NEC Dterm DTZ-8R-1 Owner's Manual

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Owner's Manual
the operation of your unit. However, your telephone company must give adequate
notice in writing prior to such actions to allow you time for making necessary
arrangements to continue uninterrupted service.
If you are having trouble with your telephone service, you must first disconnect
your telephone to determine if it is the cause of your problem. If you determine
that it is the cause, you must leave it disconnected until the trouble has been
corrected.

Radio Interference

Radio interference may occasionally cause buzzing and humming in your
cordless handset, or clicking noises in the base unit. This interference is caused
by external sources such as a PC, TV, fluorescent lighting, or electrical storm, etc.
Your unit is NOT DEFECTIVE. If these noises continue and are too distracting,
check around your office to see what appliances may be causing the problem. In
addition, we recommend that the base unit not be plugged into a circuit that also
powers a major appliance because of the potential of interference. For best
performance, ensure that the antenna on the base unit is fully extended. It may
also be necessary to re-locate the base unit
In the unlikely event that you consistently hear other voices or distracting
transmissions on your telephone, you may be receiving radio signals for another
cordless telephone or other source of interference.
Finally, it should be noted that some cordless telephones operate at frequencies
that may cause interference to nearby TVs or other electronic equipment. To
minimize or prevent such interference, the base of the cordless telephone should
not be placed near or on top of other electronic equipment. If interference is
experienced, moving the cordless telephone unit farther away will often reduce or
eliminate the interference.

More than One Cordless Telephone

If you want to use more than one cordless telephone in your office, they must
operate on different channels and must be more than 20 feet (6m) apart.
If more than eight DTZ-8R-1s are used in the same area, there is a possibility that
the following problem occurs:
Difficulty connecting the Handset with the Base Unit

Some noises can be heard during conversation

The DTZ-8R-1 is limited to five RF channels. The RF channel is changed
automatically to find the best channel.
Depending on your environment, the maximum number of cordless devices used
without interference varies.
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