T
ECHNICAL
R
EFERENCE
S Registers
Note:
To change a setting use
ATSr
=
n
, where
r
is the register and
n
is a decimal value from 0
−
255 (unless otherwise indicated).
Register Default
Function
8-17
S27
0
Bit-mapped register setup. To set the register, see instructions for S13.
Bit
Value
Result
0
1
Enables ITU-T V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem
answers both overseas and domestic (U.S. and Canada) calls, but only originates V.21 calls
(default Bell 103).
1
2
Enables unencoded (non-trellis coded) modulation in V.32 mode.
2
4
Disables V.32 modulation.
3
8
Disables 2100 Hz answer tone to allow two V.42 modems to connect faster.
4
16
Enables V.23 fallback mode.
5
32
Disables V.32
bis
mode.
6
64
Disable V.42 selective reject.
7
128
Software compatibility mode. This setting disables the codes and displays the 9600 code instead.
The actual rate of the call can be viewed on the ATI6 screen. Used for unusual software
incompatibilities. Some software may not accept 7200, 12,000, and 14,400 bps or greater result
codes.
S28
0
Eliminates the V.32 answer tones for a faster connection.
8
Default item, all times are in tenths of seconds.
255
Disables all connections except V.32 at 9600 bps.
S29
20
Sets the duration, in tenths of a second, of the V.21 answer mode fallback timer.
S30
0
Reserved
S31
128
Reserved
Summary of Contents for 3CP5613
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