Relay switching circuit
AssigneeHon Hai Precision Industry Co., Ltd.
InventorCHIH-CHENG HUANG
Life of this patent
Estimating the term…
Abstract
A relay switching circuit to route outgoing telephone calls between a VoIP and a landline and with a surge voltage protection includes a first relay, a second relay, a first control circuit, and a second control circuit. The first relay connects with a foreign exchange station (FXS) port and an FXS circuit to control a connection between the FXS port and the FXS circuit. The second relay connects with the first relay and a foreign exchange office (FXO) port to control a connection between the first relay and the FXO port. The first control circuit connects with a controller to control the first relay. The second control circuit connects with the controller to control the second relay.
Claims20
A relay switching circuit comprising:
- a first switching circuit, connecting to an FXS port and an FXS circuit to control a connection between the FXS port and the FXS circuit;
- a second switching circuit, connecting to the first switching circuit and an FXO port to control a connection between the first switching circuit and the FXO port;
- a first control circuit, connecting to a controller to receive an enable signal from the controller to control the first switching circuit;
- and
- a second control circuit, connecting to the controller to receive the enable signal from the controller to control the second switching circuit.
A communication device comprising:
- an FXS port, used to connect to a telephone;
- an FXO port, used to connect to a PSTN (Public Switched Telephone Network);
- an FXS circuit, used to process analog signals;
- an FXO circuit, used to process and transmit signals to the FXO port;
- a relay switching circuit;
- a controller, connected among the FXS circuit, the FXO circuit, and the relay switching circuit to provide an enable signal to the relay switching circuit;
- a net port, used to connect to the PSTN;
- and
- a front-end circuit, connected between the net port and the controller to process network signals;
- wherein the relay switching circuit further comprises:
- a first switching circuit, connecting to the FXS port and the FXS circuit to control a connection between the FXS port and the FXS circuit;
- a second switching circuit, connecting to the first switching circuit and the FXO port to control a connection between the first switching circuit and the FXO port;
- a first control circuit, connecting to the controller to receive the enable signal from the controller to control the first switching circuit;
- and
- a second control circuit, connecting to the controller to receive the enable signal from the controller to control the second switching circuit.
Dependencies are inferred from the claim text.