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COMSPHERE 3800 Series Modems – Model 3830
4-28 August 1998 3830-A2-GB91-30
Table 4-2
(22 of 23)
Model 3830 AT Commands
%Bn Modulation and Data Rate
Sets the modulation and maximum VF rate.
The %B300 and %B1200 commands work in conjunction with the B
(ITU-T/ Bell Mode) command to determine modulation.
%B19200 V.32
terbo
, maximum rate 19,200 bps
%B16800 V.32
terbo
, maximum rate 16,800 bps
%B14400 V.32bis, maximum rate 14,400 bps
%B12000 V.32bis, maximum rate 12,000 bps
%B9600 V.32bis/V.32, maximum rate 9600 bps
%B7200 V.32bis, maximum rate 7200 bps
%B4800 V.32bis/V.32, maximum rate 4800 bps
%B2400 V.22bis. maximum rate 2400 bps
%B1200 V.22 or Bell 212A, maximum rate 1200 bps
%B300 V.21 or Bell 103, maximum rate 300 bps
Modulation and Data Rate can also be set using S-register S41. The
following table shows the equivalent values of S41 for each %B
n
value,
and, where applicable, %B
n
in combination with B
n
.
S41 = 20 %B19200 V.32
terbo,
19,200 bps
S41 = 21 %B16800 V.32
terbo,
16,800 bps
S41 = 1 %B14400 V.32bis, 14,400 bps
S41 = 2 %B12000 V.32bis, 12,000 bps
S41 = 3 %B9600 V.32bis/V.32, 9600 bps
S41 = 4 %B7200 V.32bis, 7200 bps
S41 = 5 %B4800 V.32bis/V.32, 4800 bps
S41 = 6 %B2400 V.22bis. 2400 bps
S41 = 7 %B1200/B0 V.22, 1200 bps
S41 = 8 %B1200/B1 Bell 212A, 1200 bps
S41 = 10 %B300/B0 V.21, 300 bps
S41 = 11 %B300/B1 Bell 103J, 300 bps
The factory default is %B19200.