Ring trip detection in telecommunications exchanges

Details Ring trip detection in telecommunications exchanges Ring trip detection in telecommunications exchanges

1985-06-07

1988-03-15

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

H04M 306

Patent

active

047318287

ABSTRACT:
To facilitate ring trip detection in a telecommunications exchange the ringing signal applied to a customer line is limited to provide a square wave output. Since when the customers instrument is "on hook" virtually no direct current flows in the line, the square wave output has substantial 50--50 duty cycle and when the customer instrument goes "off hook" the d.c. alters that duty cycle, by sampling the square wave signal and counting up for, say, positive samples and down for, say negative samples, any significant change in the duty cycle causes a counter to exceed a ring-trip threshold fairly rapidly. An algorithm and circuit using the algorithm to facilitate identification of "ring trip" based on the above feature are disclosed herein.

REFERENCES:
patent: 4524245 (1985-06-01), Littlefield
patent: 4540853 (1985-09-01), Albouy

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