US Robotics 56K Series Manual page 91

Register Default
S27 (Continued)
Function
Bit Value Result
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.32bis 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
85