Circuit and method for detecting telephone line status and telep

Details Circuit and method for detecting telephone line status and telep Circuit and method for detecting telephone line status and telep

1996-02-07

1998-06-23

Zele, Krista

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

164382, H04M 100

Patent

active

057712859

ABSTRACT:
For use with a telecommunications network, circuit for, and method of, detecting telephone line status and a telephone instrument embodying the same. The circuit includes: (1) a high-impedance amplifier, couplable to the telecommunications network, for providing DC voltage representing a differential line voltage between tip and ring conductors of the telecommunications network and (2) a pulse-generation circuit, coupled to an output of the amplifier, for generating a signal having first and second states, the signal assuming the second state for a period of time inversely proportional to the differential line voltage between the tip and ring conductors.

REFERENCES:
patent: 4028493 (1977-06-01), Brennemann et al.
patent: 4839920 (1989-06-01), Held-Ebert et al.
patent: 4862491 (1989-08-01), LaSalle et al.
patent: 4868873 (1989-09-01), Kamil
patent: 4998276 (1991-03-01), Hasegawa
patent: 5241591 (1993-08-01), Saji
patent: 5388153 (1995-02-01), Burger et al.
patent: 5402009 (1995-03-01), Kiyota

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