Register | Dec. | Function & Description | Default | |
| 0, 2 | Hang up. |
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| 1, 3 | Fall back to an async connection. |
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| 4, 6 | Attempt MNP mode. If MNP fails, hang up. |
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| 5, 7 | Attempt MNP mode. If MNP fails, fallback to async |
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| connection.. |
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S37= |
| Desired DCE speed (line speed). | 000 | |
| 0 | Maximum modem speed. |
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| 2 | Attempt 1200/75 bps connection. |
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| 3 | Attempt a 300 bps connection. |
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| 5 | Attempt a 1200 bps connection. |
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| 6 | Attempt a 2400 bps connection. |
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| 7 | Attempt a 4800 bps connection. |
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| 8 | Attempt a 7200 bps connection. |
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| 9 | Attempt a 9600 bps connection. |
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| 10 | Attempt a 12000 bps connection. |
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| 11 | Attempt a 14400 bps connection. |
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| 12 | Attempt a 16800 bps connection. |
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| 13 | Attempt a 19200 bps connection. |
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| 14 | Attempt a 21600 bps connection. |
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| 15 | Attempt a 24000 bps connection. |
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| 16 | Attempt a 26400 bps connection. |
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| 17 | Attempt a 28800 bps connection. |
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| 18 | Attempt a 31200 bps connection. |
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| 19 | Attempt a 33600 bps connection. |
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S38= |
| 56K Dial Line Rate Options. Set to maximum downstream | 001 | |
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| speed at which the modem attempts to connect. |
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| 0 | 56K disabled. |
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| 1 | 56K enabled. Auto speed selection, max modem speed. |
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| 2 | 32000 bps |
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| 3 | 34000 bps |
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| 4 | 36000 bps |
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| 5 | 38000 bps |
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| 6 | 40000 bps |
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| 7 | 42000 bps |
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| 8 | 44000 bps |
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| 9 | 46000 bps |
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| 10 | 48000 bps |
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| 11 | 50000 bps |
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| 12 | 52000 bps |
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| 13 | 54000 bps |
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| 14 | 56000 bps |
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S48= | 7, 128 | LAPM error control and feature negotiation. |
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| S48=7 | Negotiation enabled |
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| S48=128 | Negotiation disabled. Force |
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| immediate fallback options |
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| specified in S36 |
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| S36=0 or 2, and S48=7 |
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| LAPM or hang up |
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| S36=0 or 2 and S48= 128 |
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