Paradyne KeepInTouch 3760 User Manual page 94

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Z modem protocol is recommended for file transfers.
Most software packages today support this protocol.
Z-modem is a efficient protocol with low overhead, and it
allows a dropped call to resume the file transfer at the
point of disconnect.
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If you are using an RJ11 adapter box, make sure that it
has a fresh battery installed.
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Although you cannot guarantee that the modem you
connect to supports ETC, the remote modem should use
V.42 error correction at a minimum. (If this is not
possible, then the remote modem should use Reliable
mode.) In addition, the remote modem should also use
similar configuration settings as described earlier.
Overview of Cellular
Communication
Cellular communication uses radio waves to transmit a call (your
signal) between the cellular telephone and the cell's
transmission tower. A cellular network consists of adjacent
geographic regions known as cells. Within each cell, there is a
transmission tower that communicates directly to both the
cellular telephone and a Mobile Telephone Switching Office
(MTSO).
The tower and MTSO constantly monitor the location and signal
power of your call. When your call becomes too weak to be
handled by the tower in that cell, either due to distance from the
tower or high activity on the network, it is "handed off" to another
cell. The tower uses radio waves to interface with the cellular
telephone, and the MTSO uses traditional land lines to interface
between the transmission tower and ultimately the remote caller.
The following is a brief list of some of the interference your
signal is subject to when using cellular channels:
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Man-made and natural structures, such as buildings,
tunnels, trees, hills, and valleys can block your signal.
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Your proximity to the cell's transmission tower can affect
your signal's strength.
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Heavy phone traffic, especially during peak periods such
as rush hour and lunch hour, and contention for an
Issue 3 April 1994
D-9