1200 bit per second fallback method for use in mobile radio

Details 1200 bit per second fallback method for use in mobile radio 1200 bit per second fallback method for use in mobile radio

H - Electricity

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H04L 29/08 (2006.01) G06F 13/14 (2006.01) H04L 1/20 (2006.01) H04M 11/06 (2006.01) H04L 1/18 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2127766

- 13 - A 1200 Bit per Second Fallback Method for use in Mobile Radio Abstract 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 bps- skipping over the data rate of 2400 bps, which is not included within the fallback sequence.

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