Zyxel Zycellular Modes; Cellular Mode Usage - ZyXEL Communications 2864 Series User Manual

ZyXEL ZyCellular Modes

In addition to normal modem, fax, and voice operation modes, the following cellu-
lar modes are offered in 2864 series modems:
Mode
MULTI-AUTO
CELL 14400
CELL 12000
CELL 9600
CELL 7200
CELL 4800T
CELL 14400 will connect with another modem using cellular mode at a speed of
up to 14400 bps. It will also connect with another V.32bis/V.32 modem. The actu-
al speed depends on the line condition. The modem will automatically fall-back or
fall-forward within its speed range.
CELL 12000, CELL 9600, and CELL 7200 limit the maximum speed to 12000
bps, 9600 bps, and 7200 bps, respectively.
CELL 4800T uses a trellis coded modulation at 4800 bps speed. It has a better per-
formance than the uncoded V.32 4800 bps mode.
The modem will automatically and dynamically select and adjust to the best speed
and mode in which to operate. Selecting one of the above cellular modes only limits
the maximum speed at which the modem will operate.
The MULTI-AUTO mode will automatically adapt to the other modem's capabili-
ty, and will request and connect in 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 for other bad line conditions such as a line with fre-
quent large impulse noise. ZyCellular mode is more noise resistant, impairment re-
sistant, 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.
Speed
V.34/ZyX modes/V.32bis/V.32/V.22bis/G3 FAX/Cellular Modes
14400/12000/9600/7200/4800
12000/9600/7200/4800
9600/7200/4800
7200/4800
4800
14–3