Method for recognizing an off-hook condition on a single...

Details Method for recognizing an off-hook condition on a single... Method for recognizing an off-hook condition on a single...

2005-08-23

2005-08-23

Kuntz, Curtis (Department: 2643)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S381000

Reexamination Certificate

active

06934382

ABSTRACT:
The invention is directed to a method for recognizing, in a system having a first terminal device and a second terminal device connected to a two-wire subscriber line, an off-hook condition of the second terminal device (2; 3) at the two-wire subscriber line (4) in a switching center (5) or the like, in which the off-hook condition of a first terminal device (3; 2) working in a different frequency band than the second terminal device at the same two-wire subscriber line is recognized by acquiring a loop d.c. (i) and comparing it to a threshold. For reducing the consumable power to be made available in the switching center (5), the invention provides that the loop d.c. (i) is compared to a second threshold that is higher than the first threshold by the minimally required current level in the operation of the first terminal device (3; 2). All off-hook conditions can thus be dependably recognized in the fundamentally same way without providing additional devices and therefore having to make additional consumable power available.

REFERENCES:
patent: 4712233 (1987-12-01), Kuo
patent: 5398277 (1995-03-01), Martin et al.
patent: 5422939 (1995-06-01), Kramer et al.
patent: 5506891 (1996-04-01), Brown
patent: 6240177 (2001-05-01), Guntzburger et al.
patent: 6426961 (2002-07-01), Nimmagadda
patent: 199 42 691 (2001-03-01), None

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