Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent
1997-03-27
1998-12-01
Isen, Forester W.
Telephonic communications
Multi-line or key substation system with selective switching...
Line status indication or call alerting
379179, 379202, 379252, H04M 100
Patent
active
058449779
ABSTRACT:
An apparatus for detecting customer premise equipment alerting signals (CAS) in a first telephone having a transmit circuit and a receive circuit and a hybrid line termination for connecting the transmit circuit and the receive circuit to a central office line. The apparatus includes an off-hook detector for producing an off-hook signal identifying whether or not the first telephone is in an off-hook state, an extension-in-use detector for producing an extension-in-use signal identifying whether or not a second telephone connected to the central office line is in an off-hook state, a CAS detector selectively operable to receive the CAS signals directly from the central office line and from the hybrid line termination and a control element for controlling the CAS detector in response to the off-hook signal and the extension-in-use signal. The control element acts to enable the CAS detector to monitor the CAS signals on the central office line directly when the second telephone is in the off-hook state and enable the CAS detector to monitor the CAS signals from the hybrid line termination when the first telephone is in an on-hook state, and the second telephone is in an off-hook state.
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International Applicantion Published Under the Patent Cooperation Treaty (PCT), Publication Number WO 96/25816, Publication Date Aug. 22, 1996. PCT International Application Serial No. PCT/US96/01115 filed Feb. 12, 1996. Title: Caller ID and Call Waiting for Multiple CPEs on a Signal Telephone. Applicant: CIDCO, Incorporated.
International Application Published Under the Patent Cooperation Treaty (PCT), Publication Number WO 96/25825, Publication Date Aug. 22, 1996. PCT International Application Serial No. PCT/US96/01526 filed Feb. 13, 1996. Title: Method and Structure for Detecting a Customer Premises Equipment Alrerting Signal. Applicant: CIDCO, Incorporated.
Kos Stephen
McKinney Brian Clifford
Isen Forester W.
Northern Telecom Limited
Tieu Binh K.
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