| 摘要 |
A 1200 Bit per Second Fallback Method for use in Mobile Radio In a mobile data communications system, a near-end modem (100) initiates a data connection to a far-end modem (300) at the highest permissible data rate, e.g., at 9600 bits per second (bps). If the communications channel subsequently degrades, either the near-end modem, or the far-end modem, initiates an autorate, or fallback sequence, e.g., to 4800 bps. However, if channel performance is still poor at 4800 bps, then one, or both, of the modems initiate a fallback to 1200 bpsskipping over the data rate of 2400 bps, which is not included within the fallback sequence.
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