4 AT Commands,
Register | Unit | Range | Default | Description |
S37 | decimal | 0 | Sets the maximum V.34 “upstream” speed at | |
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| which the modem attempts to connect. |
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 | 1 | Sets the maximum 56K “downstream” speed | |||
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| at which the modem attempts to connect. | |||
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| The default maximum speed is 56K bps. | |||
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| Value | V.90 mode | K56flex mode |
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| 0 | 56K disabled | 56K disabled | |
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| 1 | 56K autorate | 56K autorate | |
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| 2 | 28000 bps | 32000 bps | |
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| 3 | 29333 bps | 34000 bps | |
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| 4 | 30666 bps | 36000 bps | |
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| 5 | 32000 bps | 38000 bps | |
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| 6 | 33333 bps | 40000 bps | |
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| 7 | 34666 bps | 42000 bps | |
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| 8 | 36000 bps | 44000 bps | |
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| 9 | 37333 bps | 46000 bps | |
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| 10 | 38666 bps | 48000 bps | |
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| 11 | 40000 bps | 50000 bps | |
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| 12 | 41333 bps | 52000 bps | |
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| 13 | 42666 bps | 54000 bps | |
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| 14 | 44000 bps | 56000 bps | |
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| 15 | 45333 bps |
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| 16 | 46666 bps |
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| 17 | 48000 bps |
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| 18 | 49333 bps |
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| 19 | 50666 bps |
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| 20 | 52000 bps |
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| 21 | 53333 bps |
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| 22 | 54666 bps |
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| 23 | 56000 bps |
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