Multitech MultiModem ZBA Series At Commands Reference Manual page 27

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S37
S38
S42
Multi-Tech Systems, Inc. AT Commands for the MT5634 Family of Products (S000272J)
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Unit Range Default
decimal 0–19 0
decimal 0–255 1
decimal 0–1 1
Description
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
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
19 50666 bps
20 52000 bps
21 53333 bps
22 54666 bps
23 56000 bps
Enables/disables the 56K auto rate. When 56K auto is
disabled, fallback to V.34 is also disabled. 0 = disable; 1 =
enable.
Chapter 2 – S-Registers
27