False framing detector

Details False framing detector False framing detector

1977-12-27

1979-02-27

Robinson, Thomas A.

Telegraphy

Systems

Printing

178 691, H04J 306, H04L 700

Patent

active

041420705

ABSTRACT:
A framing circuit for a pulse code modulated, time multiplexed data receiver provides terminal framing by first detecting a predetermined terminal frame bit code and then checking for false framing by utilizing a false framing detector to count the number of times a particular pattern in a signaling frame bit code occurs. The false framing detector is enabled after terminal framing of the receiver has been accomplished. The false framing detector thereby provides a cross-check between the terminal frame code and the signaling frame code to assure that the receiver has not erroneously framed on a 2 khz interference tone. The cross-check occurs during data reception after terminal framing so that the false frame detector does not delay reframing under ordinary circumstances.

REFERENCES:
patent: 3461239 (1969-08-01), Widl
patent: 3742139 (1973-06-01), Boehly et al.
patent: 3909540 (1975-09-01), Maryscuk et al.
patent: 4002845 (1977-01-01), Kaul et al.
patent: 4010325 (1977-03-01), Kline

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