ZyXEL Communications 2864 - Manual (Page 152)

14–4
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 mo-
dem 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 a manual transmission power setting is desired, set S43.2=1 to disable auto-
matic transmission power adjustment and use S49 bits 0-3 to set the transmission
power to -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
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 inter-
face 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 cellu-
lar phone that will convert a specific cellular phone's interface to a standard tele-
phone company's 2-wire phone interface. A cellular modem can connect to a
cellular phone using such an adapter.
If you are using a cellular phone data interface adapter, the following figures illus-
trate three installation examples. The figures are illustrated with a U-1496P model.
You can use a 2864 series modem, such as the Omni 288S, in the same way.