Fallback method to 1200 bits per second for use in mobile radio

Details Fallback method to 1200 bits per second for use in mobile radio Fallback method to 1200 bits per second for use in mobile radio

1993-07-26

1995-09-12

Kuntz, Curtis

Pulse or digital communications

Transceivers

Modems

375377, 379 93, 379 98, 379 59, 348405, 348406, H04L 100

Patent

active

054504384

ABSTRACT:
In a mobile data communications system, a near-end modem initiates a data connection to a far-end modem 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.

REFERENCES:
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patent: 4956851 (1990-09-01), Wolensky et al.
patent: 5007047 (1991-04-01), Sridhar et al.
patent: 5050004 (1991-09-01), Morton, Jr.
patent: 5159465 (1992-10-01), Maemura et al.
patent: 5241565 (1993-08-01), Kloc et al.
patent: 5297186 (1994-03-01), Dong

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