Excavating
Patent
1987-12-28
1989-09-19
Fleming, Michael R.
Excavating
371 66, 371 204, G06F 1100
Patent
active
048688240
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: 4238779 (1980-12-01), Dickinson
patent: 4351059 (1982-09-01), Gregoire
patent: 4385384 (1983-05-01), Rosbury
patent: 4390989 (1983-06-01), Pahrson
patent: 4617662 (1986-10-01), Auer
patent: 4710929 (1987-12-01), Kelly
American Telephone and Telegraph Company
AT&T Information Systems Inc.
Fleming Michael R.
Slusky Ronald D.
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