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Chapter 4 - Advanced Data Communications
4-5
Certain modes, such as the ZyXEL proprietary modes, Fax mode, and Cellular
modes can be added or omitted from the auto-negotiation process using the S-
registers settings listed below.
Mode Disable Enable
ZyXEL 19200 S43.1=1 S43.1=0 *
ZyXEL16800 S43.0=1 S43.0=0 *
G3 Fax S38.4=1 S38.4=0 *
Cellular S43.3=1 * S43.3=0
* Denotes default setting.
Setting the DTE to DCE Rate
The Omni 288S DTE to DCE rate can be determined in three ways:
1. By default the DTE to DCE rate is equal to the DTE speed set by S20
(default S20=1 for 115200 bps). This mode is set with &B1.
2. To set the DTE to DCE rate to follow the connect speed, set &B0.
3. To force the modem to use a fixed baud rate when answering, set S18 to the
corresponding value.
S18= Speed S18= Speed
0 * Disable fixed rate 15 300 bps
1 115200 bps 16 307200 bps
2 76800 bps 17 153600 bps
3 57600 bps 18 102400 bps
4 38400 bps 20 61440 bps
5 19200 bps 21 51200 bps
6 16800 bps 22 624000 bps
7 14400 bps 24 124800 bps
8 12000 bps 25 62400 bps
9 9600 bps 26 41600 bps
10 7200 bps 27 31200 bps
11 4800 bps 28 24960 bps
12 2400 bps 29 20800 bps
13 1200 bps 32 230400 bps
14 460800 bps 46 921600 bps
* Denotes default setting
Error Control
Error control keeps the modem data link error-free by detecting and re-
transmitting erroneous data. ZyXEL modems support both MNP and V.42 error
control protocols. The MNP protocol was an industry de facto standard
developed and licensed by Microcom, Inc. ZyXEL modems support level 4 and 3