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Cellular Communications
Tips for Successful
Cellular Operation
The following section lists several issues to be aware of when
using cellular channels for data communications:
G
When using a new software package, computer, or
modem for the first time, always try a land-line
connection first. (Remember, with the Automatic Cellular
Setup command, switching between configurations is
easy.)
G
Some connection problems may be due to a non-ETC
modem on the land-line side of the connection. Review
the previous sections on Cellular Modem Pools and
Connecting to Non-ETC Modems.
G
Be sure to turn your PC (with the modem installed and
enabled) on before turning the cellular telephone on. If
you do not see dialing digits on your cellular telephone
after issuing a Dial (D) command, turn your cellular
telephone off and then back on.
G
Cellular communications within a building may not be
possible due to the number of obstructions within a
building. If you are having problems while trying to
transfer or receive data from inside a building, try
locating the cellular telephone near a window for better
cellular reception.
G
Make sure that the cellular telephone's battery is
charged. If the battery is low, a "low battery" signal from
the telephone may interfere with the modem's
operations. Modem performance may also be poor if the
battery is low.
G
If possible, avoid peak cellular transmission hours.
Heavy telephone traffic during this period (for example,
rush hour and lunch hour) can impair network conditions
and affect data transfers. (An added bonus is that cellular
rates are usually lower during off-peak hours.)
G
When using a hand-held cellular telephone (a
600 milliwatt telephone), make sure the antenna is
extended and that the telephone rests in a vertical
position. Commercially available leather briefcases that
hold the computer and telephone help facilitate this.
D-6
Issue 2
May 1995
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