3Com 1.024.1644-00 - Manual (Page 75)

Technical Reference
69
Register Default Function
S27 (Continued) Bit Value Result
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.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.
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