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
