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4 AT Commands, S-Registers, and Result Codes
41
MultiModemZPX User Guide
S37 decimal 0–19 0 Sets the maximum V.34 “upstream” speed
at which the modem attempts to connect.
Value Speed
0 maximum modem speed
1 reserved
2 1200/75 bps
3 300 bps
4 reserved
5 1200 bps
6 2400 bps
7 4800 bps
8 7200 bps
9 9600 bps
10 12000 bps
11 14400 bps
12 16800 bps
13 19200 bps
14 21600 bps
15 24000 bps
16 26400 bps
17 28800 bps
18 31200 bps
19 33600 bps
S38 decimal 0–23 1 Sets the maximum 56K “downstream” speed
at which the modem attempts to connect.
The default maximum speed is 56K bps.
Note: When using V.34 or V.32 client-to-client
connections in poor conditions, setting
S38=0 may result in better performance.
Value Rate
0 56K disabled
1 56K autorate
2 28000 bps
3 29333 bps
4 30666 bps
5 32000 bps
6 33333 bps
7 34666 bps
8 36000 bps
9 37333 bps
10 38666 bps
11 40000 bps
12 41333 bps
13 42666 bps
14 44000 bps
15 45333 bps
16 46666 bps
17 48000 bps
18 49333 bps
Register Unit Range Default Description