US Robotics 56K Series Manual page 88

Register Default
S15 0
S16 0
S17 0
82
Function
Bit-mapped register setup
To set the register, see instructions for S13
Bit Value Result
0 1 Disable ARQ/MNP for V.22
1 2 Disable ARQ/MNP for V.22bis
2 4 Disable ARQ/MNP V.32/V.32bis
3 8 Disable MNP handshake
4 16 Disable MNP level 4
5 32 Disable MNP level 3
6 64 MNP incompatibility
7 128 Disable V.42 operation
To disable V.42 detect phase, select the total of the values for bits 3 and
7. (S15=136{the sum of values 8 and 128})
Reserved
Reserved