Telephone network access device
AssigneesAmbit Microsystems (Shanghai) Ltd., Hon Hai Precision Industry Co., Ltd.
InventorsYu-Chan Nieh, Chien-Sheng Wu, Zhen-Hua Xiong
Life of this patent
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Abstract
A telephone network access device switchable between a VOIP service and a PSTN service includes an RJ-11 port, a voice splitter, a first relay, a second relay, a SLIC chip, a CPU, and a ring detection unit. The ring detection unit outputs a first switch signal in response to detecting a ring signal of a PSTN communication. The second relay connects the telephone to the VOIP network in response to a power on event. The CPU controls the first relay and the second relay to connect the telephone to the PSTN network in response to the CPU receiving the first switch signal, and controls the second relay to reconnect the telephone to the VOIP network when the PSTN communication ends.
Claims6
A telephone network access device comprising:
- an RJ-11 port coupled to a public switched telephone network (PSTN) network;
- a voice splitter coupled to the RJ-11 port;
- a subscriber line interface circuit (SLIC) chip coupled to a voice over Internet protocol (VOIP) network;
- a first relay coupled to the voice splitter;
- a second relay coupled to the first relay, the SLIC chip, and a telephone;
- a ring detection unit coupled between the first relay and the voice splitter, wherein the ring detection unit outputs a first switch signal in response to detecting a ring signal from a PSTN communication;
- and
- a central processing unit (CPU) coupled to the first relay, the second relay, the SLIC chip, and the ring detection unit, and receiving the first switch signal from the ring detection unit;
- wherein the second relay connects the telephone to the VOIP network in response to a power on event, the CPU controls the first relay and the second relay connecting the telephone to the PSTN network in response to the CPU receiving the first switch signal from the ring detection unit, and controls the second relay reconnecting the telephone to the VOIP network in response to an ending of the PSTN communication;
- wherein the ring detection unit comprises:
- a first terminal;
- a second terminal;
- a triode;
- a dual direction coupler comprising a first input terminal coupled to the first terminal, a second input terminal coupled to the second terminal via two zener diodes that connect in series opposing directions, and outputting the first switch signal to the CPU;
- wherein an emitter of the triode is coupled to a ground, a collector of the triode is coupled to the CPU, the first input terminal of the dual direction coupler coupled to the first terminal via a capacitor, the second input terminal of the dual direction coupler coupled to the second terminal via a resistor, and the dual direction coupler outputs a first periodic square-wave signal to the CPU via the collector of the triode in response to the dual direction coupler detecting the ring signal;
- and
- wherein the first switch signal is the same as the first periodic square-wave signal.
Dependencies are inferred from the claim text.