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Chapter 7 - Cellular Mode Operation
7-3
The MULTI-AUTO mode will automatically adapt to the other modem's
capability, and will request and connect the appropriate mode. If both sides have
cellular mode capability and at least one side is using a cellular phone, using
MULTI-AUTO to make or answer a data call will result in a cellular mode
connection. MULTI-AUTO is the default mode.
Cellular Mode Usage
Usage of the cellular mode is recommended when using a cellular link for modem
connections. It can also be used other bad line conditions such as a line with
frequent large impulse noise. ZyCellular mode is more noise resistant, impairment
resistant, and error resistant.
It is simple to use the ZyCellular mode. Everything is determined automatically by
the modem. The user only needs to set S-register S49 bit 7 and leave the modem
on MULTI-AUTO. The modem takes care of everything else.
S49b7 tells the modem where it is installed. If S49.7=0, the modem is installed in
an office connected to a normal telephone line; if S49.7=1, it means the modem is
a mobile unit connected to a cellular phone. When a ZyCellular modem calls or
answers another modem, it will indicate its cellular capability and whether it is
using a cellular phone. If both sides have the ZyCellular capability and at least
one side is using a cellular phone, the connection will automatically be a cellular
mode connection such as it would be if it were using CELL 14400 mode. If one
side is a normal non-cellular modem, the connection will automatically be a
normal modem mode.
If manual power setting is desired, set S43.2=1 to disable power adjustment
and use S49 bits 0-3 to set power -9 to -24 dBm.
If a cellular mode connection is desired, set S43.3=0 to enable the cellular mode
connection. The default for this option is to be disabled (S43.3=1).
You can also send and receive faxes on cellular links by setting S49.7=1 on the
ZyCellular modem that is using a cellular phone. Now your modem can send and
receive faxes to and from fax machines and other fax modems.
Cellular Modem Installation Examples
The most difficult part of cellular modem installation is connecting the modem to
the cellular phone. There is no standard on the interface and connector type that a
cellular phone should use or provide. Every cellular phone maker has its own
interface design. There isn't a standard way to connect a modem to a different
brand of cellular phone. Some vendors have made a specific adapter for each
model of cellular phone that will convert a specific cellular phone's interface to a
standard telephone company's 2-wire phone interface. A cellular modem can
connect to a cellular phone such an adapter.