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4 AT Commands, S-Registers, and Result Codes
73
S38
decimal 0–14 1 Sets the maximum 56K
“downstream” speed at which
the modem attempts to
connect. The default
maximum speed is 56K bps.
0 = 56K disabled
1 = 56K enabled with auto-
matic speed selection at
maximum modem speed
2 = 32000 bps
3 = 34000 bps
4 = 36000 bps
5 = 38000 bps
6 = 40000 bps
7 = 42000 bps
8 = 44000 bps
9 = 46000 bps
10 = 48000 bps
11 = 50000 bps
12 = 52000 bps
13 = 54000 bps
14 = 56000 bps
S42
decimal 0–1 1 Enables/disables the 56K
auto rate. When 56K auto is
disabled, fallback to V.34 is
also disabled. 0 = disable;
1 = enable.
S43
decimal 0–1 1
For For testing and
debugging only.
Enables/
disables V.32bis start-up
auto mode operation. 0 =
disable; 1 = enable.
Register Unit Range Default Description