Data transmission with improved message format

Details Data transmission with improved message format Data transmission with improved message format

1987-12-28

1989-12-05

Atkinson, Charles E.

Excavating

371 471, 375106, G08C 2500, G06F 1110

Patent

active

048857491

ABSTRACT:
In a voiceband data multipoint network, each tributary modem transmits, in a trailer which follows the user data, a tributary modem identification, a sequence number which advances for each start-up and a checksum. The observation at the receiver of a gap in the series of sequence numbers in messages determined to have originated from a particular tributary modem is used to accurately compute a missed message rate for that modem.

REFERENCES:
patent: 4377862 (1983-03-01), Koford et al.
patent: 4422171 (1983-12-01), Wortley et al.
patent: 4439859 (1984-03-01), Donnan
patent: 4507782 (1985-03-01), Kunimasa et al.
patent: 4511958 (1985-04-01), Funk
patent: 4691314 (1987-01-01), Bergins et al.

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