Method and apparatus for switch hook detection

Details Method and apparatus for switch hook detection Method and apparatus for switch hook detection

2005-03-08

2005-03-08

Mei, Xu (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S399010

Reexamination Certificate

active

06865269

ABSTRACT:
A method and apparatus is provided. The method includes receiving a signal over a connection from a telephonic device, determining if the signal is greater than a first preselected value, and adjusting a transient response time of a host transceiver configured to receive the signal in response to determining that the signal is greater than the first preselected value. The method further includes determining a switch hook state of the telephonic device based on a DC component of the signal. The apparatus includes first logic capable of receiving a signal over a connection from a telephonic device, second logic capable of determining if the signal is greater than a first preselected value, and third logic configured to receive the signal, the third logic being capable of adjusting a transient response of the apparatus configured to receive the signal in response to determining that the signal is greater than the first preselected value. The apparatus further includes fourth logic capable of determining a switch hook state of the telephonic based on a DC component of the signal.

REFERENCES:
patent: 4277648 (1981-07-01), Glassman
patent: 5583934 (1996-12-01), Zhou
patent: 5636273 (1997-06-01), Schopfer et al.

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