ZyXEL U-1496S Plus User Guide - Page 75

Cellular Modem Installation

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CELL 4800T uses a trellis coded modulation at 4800 bps speed. It has a better performance than the uncoded V.32 4800 bps mode. CELL 4800C uses forward error correction to get a low error rate at 4800 bps net link speed. CELL 3600C and CELL 2400C also use forward error correction to get a net speed of 3600 bps and 2400 bps. They are more robust than the CELL 4800C mode. Forward error correction mode is used when there is a high number of errors. The modem will automatically and dynamically select the best speed and mode to operate (DCSS). Selecting one of the above cellular modes only limits the maximum speed at which the modem will operate. It automatically chooses and adjusts to the best operating speed and mode under the maximum speed. The multi-auto mode will automatically adapt to the other side's capability and request and connect at 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 cellular mode connection. Multi-auto is the default mode. CELLULAR MODE USAGE Cellular mode is recommended rather than using a cellular link for modem connection. It can also be used on other bad line conditions such as a line with frequent impulse noise. Cellular mode is more noise resistant, impairment resistant, and error resistant. It is simple to use the cellular modes. 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 all others. S49b7 is to tell the modem where the modem is installed. If S49b7=0, the modem is installed in an office connected to a normal telephone line; if S49b7=1, it means the modem is installed in a mobile 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 the 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 regular modem, the connection will automatically be a regular modem mode. If a manual transmit power setting is desired, set S43b2=1 to disable auto transmit power adjustment and use S49 bit 0-3 to set transmit power at -9 to -24 dBm. If cellular mode connection is never desired, setting S43b3=1 will disable the cellular mode connection. The default is enabled. CELLULAR MODEM INSTALLATION The most difficult part of cellular modem installation is to connect the modem to the cellular phone. There is no standard on the signal and connector type a cellular phone should use or provide. Every cellular phone maker has their own design. There isn't a standard way to connect a modem to different brand of cellular phone. Some vendors have made a specific adapter for each different model of cellular phone to convert a specific cellular phone's available outside interface to a normal telephone company's 2-wire phone interface that is available in homes and offices. A cellular modem can connect to a cellular phone through such an adapter.

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CELL 4800T uses a trellis coded modulation at 4800 bps speed. It has a better performance than
the uncoded V.32 4800 bps mode.
CELL 4800C uses forward error correction to get a low error rate at 4800 bps net link speed.
CELL 3600C and CELL 2400C also use forward error correction to get a net speed of 3600 bps
and 2400 bps. They are more robust than the CELL 4800C mode. Forward error correction mode
is used when there is a high number of errors.
The modem will automatically and dynamically select the best speed and mode to operate
(DCSS). Selecting one of the above cellular modes
only limits the maximum speed at which the
modem will operate.
It automatically
chooses and adjusts to the best operating speed and mode
under the
maximum speed.
The multi-auto mode will automatically adapt to the other side's capability and request and
connect at 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 cellular
mode connection. Multi-auto is the default mode.
CELLULAR MODE USAGE
Cellular mode is recommended rather than using a cellular link for modem connection. It can
also be used on other bad line conditions such as a line with frequent impulse noise. Cellular
mode is more noise resistant, impairment resistant, and error resistant.
It is simple to use the cellular modes. 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 all others.
S49b7 is to tell the modem where the modem is installed. If S49b7=0, the modem is installed in
an office connected to a normal telephone line; if S49b7=1, it means the modem is installed in a
mobile 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 the 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 regular modem, the connection will automatically be a regular modem
mode.
If a manual transmit power setting is desired, set S43b2=1 to disable auto transmit power
adjustment and use S49 bit 0-3 to set transmit power at -9 to -24 dBm.
If cellular mode connection is never desired, setting S43b3=1 will disable the cellular mode
connection. The default is enabled.
CELLULAR MODEM INSTALLATION
The most difficult part of cellular modem installation is to connect the modem to the cellular
phone. There is no standard on the signal and connector type a cellular phone should use or
provide. Every cellular phone maker has their own design. There isn't a standard way to connect
a modem to different brand of cellular phone. Some vendors have made a specific adapter for
each different model of cellular phone to convert a specific cellular phone's available outside
interface to a normal telephone company's 2-wire phone interface that is available in homes and
offices. A cellular modem can connect to a cellular phone through such an adapter.