System and equipment for quality checking of a digital connectio

Details System and equipment for quality checking of a digital connectio System and equipment for quality checking of a digital connectio

1977-02-15

1978-06-06

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

1791753R, G08C 2500

Patent

active

040939405

ABSTRACT:
A system for quality checking of a digital connection circuit using a telephone line. Its principle resides in alternately and repetitively transmitting a check message followed by a quality character from one to the other of two similar equipments respectively located at the ends of the circuit. The quality character takes account of the results of the checking effected by the corresponding equipment when it receives the last previously transmitted check message. The latter message further includes a n times repeated synchronization character and a pseudo-random series of p binary signals and is immediately followed by a quality character which is stored and displayed by the receiving equipment which operates at the considered time.

REFERENCES:
patent: B394088 (1975-01-01), Han
patent: 3315228 (1967-04-01), Futerfas et al.
patent: 3491338 (1970-01-01), Malloy
patent: 3496536 (1970-02-01), Wheeler et al.
patent: 3596245 (1971-07-01), Finnie et al.
patent: 3760354 (1973-09-01), Ginn
patent: 3904861 (1975-09-01), McNamara
patent: 4022988 (1977-05-01), Lentz et al.

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