Telephonic communications – Reception of calling information at substation in wireline...
Reexamination Certificate
1999-04-30
2001-09-25
Nguyen, Duc (Department: 2643)
Telephonic communications
Reception of calling information at substation in wireline...
C379S142080, C379S142040, C379S399010, C379S399020, C379S413000
Reexamination Certificate
active
06295347
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to telephone caller identification apparatus, and more specifically, to a calling identity delivery on call waiting apparatus using subscriber loop power during off-hook operation.
2. Description of the Related Art
Caller identification systems have been in use for a number of years. Operation of the caller identification apparatus requires detection of tones provided by the telephone service provider.
Call waiting service has also been provided by telephone service providers for a number of years. Alerting signals are provided by the service provider to alert the subscriber's equipment that another call is arriving while the telephone receiver is off-hook.
In order to provide caller identification service during off-hook operation, the caller identification apparatus must detect the Customer Premises Equipment Alerting Signal (CAS). This signal is provided by the Calling Identity on Call Waiting service (CIDCW).
Detectors for the CAS signal consume relatively large amounts of power, as the detection of the CAS tone is not as simple as detecting a ringing or hook reversal condition. The CAS detector must operate while the subscriber loop is in the off-hook condition and consumes power continuously while the user is connected to the service. Therefore, while caller identification apparatus in the present state of the art can be powered by a small battery, operation of caller identification in conjunction with call waiting services however requires more power. In response to the power requirement problem, caller identification apparatus designed for use with call waiting services are powered by a separate power supply connected to the subscriber's AC power service.
This is a cost disadvantage and is also an inconvenience to the subscriber. A power outlet may not be available near the desired location of the caller identification apparatus and a complete system requires an additional power supply and associated packaging, storage and shipping costs.
The present apparatus and method provide a solution to the problem by using the subscriber loop to power the CAS tone detectors while the telephone is off-hook.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide apparatus and methods which power CAS detection circuits for caller identity notification from the subscriber loop while a telephone is off-hook.
It is another object of the present invention to provide control of the off-hook and on-hook state and to alert the central office that caller identification tones for the incoming call can be sent.
It is a further object of the invention to provide automatic disconnection of the CAS detector power from the subscriber line when the subscriber equipment returns to an onhook condition.
The foregoing and other objects, features, and advantages of the invention will be apparent from the following, more particular, description of the preferred embodiment of the invention, as illustrated in the accompanying drawings.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to one aspect of the invention, a caller identification apparatus for connection to a subscriber loop is disclosed. The caller identification apparatus for connection to a subscriber loop comprises: a caller identification data receiver coupled to the subscriber loop for decoding caller identification tones; a CAS tone detector for detecting an alerting signal having at least one tone detector power supply input; a hook switch coupled to the subscriber loop for controlling the hook state of the subscriber loop; a power supply circuit having at least one power supply output and a power source; wherein said at least one power supply output is coupled to said at least one tone detector power supply input; and wherein said power source is coupled to said subscriber loop for supplying power from said subscriber loop to said CAS tone detector.
According to another aspect of the invention, a method for powering a calling identity delivery on call waiting detector from subscriber loop power is disclosed. The method for powering a calling identity delivery on call waiting detector from subscriber loop power comprises the steps of: detecting an off-hook condition; supplying power to a CAS signal detector from the subscriber loop; removing the off-hook condition when a CAS signal is received; restoring the off-hook condition; receiving caller identification tones; and removing the power from the CAS signal detector when an on-hook condition is detected.
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patent: 2340342 (2000-02-01), None
Fan Yuan-Neng
Tung Shih-Ming
Fanstel Systems, LLC
Moy Jeffrey D.
Nguyen Duc
Tran Quoc
Weiss Harry M.
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