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As the car kit user moves from one network cell to another, the
signal strength of the channel drops and the cellular telephone
exchange may hand the user over to a different cell and
frequency where the signal is stronger. A cell handover may also
occur when the user is stationary due to varying cellular traffic
loads. Such handovers may cause delays.
Dead spots and dropouts
Dead spots are areas where radio signals cannot be received.
Dropouts occur when the car kit user passes through an area
where the radio signal is blocked or reduced by geographic or
man-made obstructions such as hills or high buildings. The
consequences may be interruptions in service or the connection
may fail.
Low signal strength
Due to either distance from a base station or obstacles between
your car kit and the base station, the radio signal strength from
a cell site may not be strong or stable enough to provide a
reliable cellular connection for trouble-free reception or
transmission. Therefore, to ensure the best possible
communication, remember to take the following points into
consideration when using your car kit:
Data and fax transmissions work best when the car is stationary
as this helps to maintain the signal strength. Attempting
cellular data communication while in a moving vehicle is not
recommended. Fax transmission is more easily impaired than
data or short message transmission.
Check the signal strength on your car kit display. If the cellular
signals are not strong enough to support a voice call, data
connection should not be attempted until you can find a
location with better reception.



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