Invention Grant
- Patent Title: Fallback function telecommunications device
- Patent Title (中): 后备功能电信设备
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Application No.: US09986333Application Date: 2001-11-08
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Publication No.: US06980643B2Publication Date: 2005-12-27
- Inventor: Su-Yi Chen , Benson Chen
- Applicant: Su-Yi Chen , Benson Chen
- Applicant Address: TW Taiepi
- Assignee: Askey Computer Corp.
- Current Assignee: Askey Computer Corp.
- Current Assignee Address: TW Taiepi
- Agency: Browdy and Neimark, PLLC
- Main IPC: H04M1/253
- IPC: H04M1/253 ; H04M1/82 ; H04M3/12 ; H04M7/00 ; H04M1/00 ; H04M3/00

Abstract:
The invention herein is fallback function communications device comprised of a microprocessor, utilized to perform a predetermined operation and processing of a predetermined input signal and then output a corresponding signal, as well as a minimum of one relay circuit having an amplifier circuit and a relay. The terminal at the first side of the relay is connected to the telephone line tip/ring terminal, while the terminal at the second side of the relay is connected to the Public Services Telephone Network (PSTN) tip/ring terminal of the microprocessor. An off-hook detection circuit is connected to the PSTN tip/ring terminal and also connected to the ring detection terminal of the said microprocessor. A dummy load circuit is connected to the tip terminal and the ring terminal of the PSTN. As such, in the event of Voice Over Internet Protocol (VOIP) system failure, the present invention is capable of automatically switching to the PSTN and thereby maintain telephone system operation.
Public/Granted literature
- US20030086559A1 Fallback function telecommunications device Public/Granted day:2003-05-08
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