Digital activity loss detector

Details Digital activity loss detector Digital activity loss detector

1988-08-18

1989-12-12

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

371 62, 307443, 307517, 307328, 3072964, 370111, G08B 2100, G06F 1100

Patent

active

048870714

ABSTRACT:
A digital activity detection circuit is provided for monitoring digital input signals such as telecommunications DS1 or DS2 signals, and for generating an alarm when a predetermined input signal loss threshold is reached, such that the input signal loss threshold does not vary with temperature, with component value or with power supply variations. Precise resolution and simplified hardware are achieved in a novel arrangement of counters in the signal activity detector to determine the resolution and signal loss threshold of the detector, all in a digital arrangement without the use of analog devices or retriggerable monostable multivibrators, and in an ASIC fabricable integrated circuit technology such as CMOS.

REFERENCES:
patent: 4017724 (1977-04-01), Finger
patent: 4196362 (1980-04-01), Maehashi
patent: 4455456 (1984-06-01), Cochran
patent: 4566111 (1986-01-01), Tanagawa
patent: 4633194 (1986-12-01), Kikuchi
patent: 4763342 (1988-08-01), Ambrosio
patent: 4839908 (1989-06-01), Takayama

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