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US 7,031,464 B2Granted
Ring relay control unit for foreign exchange station
AssigneeLG Electronics Inc.
InventorJong Heon Lee
Life of this patent
Estimating the term…
Abstract
The ring relay control unit of an FXS includes a main control unit for controlling relay interrupt command; a relay control device for generating a relay control signal in accordance with a relay interrupt command transferred from the main control unit, an SLIC for interfacing a call signal to a subscriber's phone, a ring signal generator for generating a ring signal transferred to the subscriber's phone, and transferring a synchronous signal, which generates a relay control signal, to the relay control device, and a relay for selectively transferring the call signal and the ring signal to the subscriber's phone from the SLIC and the ring signal generator.
Claims19
A ring relay control unit of a foreign exchange station for signaling a subscriber telephone, the ring relay control unit comprising:
- a main control unit for generating a relay interrupt command;
- a relay control device connected to the main control unit to generate a ring generation inhibit signal in response to the relay interrupt command to disable generation of a ring signal;
- a ring signal generator connected to the relay control device to generate a ring signal to the subscriber telephone in response to the ring generation inhibit signal and to transmit a synchronous signal to the relay control device,
- wherein the relay control signal is generated in response to the synchronous signal;
- and
- a relay for selectively transferring the ring signal to the subscriber telephone from the ring signal generator in response to the relay control signal,wherein the synchronous signal controls timing of the relay control signal to selectively transfer one of the ring signal or a call signal to the subscriber telephone.
3 more elements
A ring relay control unit of a foreign exchange station for signaling a subscriber telephone, the ring relay control unit comprising:
- a main control unit for generating a relay interrupt command;
- a relay control device connected to the main control unit to generate a relay control signal and a ring generation inhibit signal in response to the relay interrupt command from the main control unit;
- a ring signal generator connected to the relay control device for generating a ring signal to the subscriber telephone in response to the ring generation inhibit signal, and for transmitting a synchronous signal to the relay control device, wherein the relay control device generates the relay control signal in response to the synchronous signal;
- a relay for selectively transferring the ring signal to the subscriber telephone from the ring signal generator in response to the relay control signal;
- a SLIC for interfacing a call signal to the subscriber telephone, wherein the relay selectively transfers the call signal and the ring signal to the subscriber telephone from the SLIC and the ring signal generator,
- wherein the relay control device generates the relay control signal to interface the relay to the SLIC and transmits the ring generation inhibit signal to the ring signal generator if the relay interrupt command is received from the main control unit to interface the call signal to the subscriber telephone.
3 more elements
A ring relay control unit of a foreign exchange station for signaling a subscriber telephone, the ring relay control unit comprising:
- a main control unit for generating a relay interrupt command;
- a relay control device connected to the main control unit to generate a relay control signal and a ring generation inhibit signal in response to the relay interrupt command from the main control unit;
- a ring signal generator connected to the relay control device for generating a ring signal to the subscriber telephone in response to the ring generation inhibit signal, and for transmitting a synchronous signal to the relay control device, wherein the relay control device generates the relay control signal in response to the synchronous signal;
- and
- a relay for selectively transferring the ring signal to the subscriber telephone from the ring signal generator in response to the relay control signal,
- wherein the relay control device comprises a D flip-flop for generating the relay control signal in response to the relay interrupt command from the main control unit and the synchronous signal from the ring control generator.
3 more elements
A method of signaling a subscriber telephone using a ring relay control unit of a foreign exchange station, the method comprising:
- generating a relay interrupt command by a main control unit;
- generating a relay control signal and a ring generation inhibit signal by a ring relay control device in response to the relay interrupt command from the main control unit;
- generating a ring signal by a ring signal generator for the subscriber telephone in response to the ring generation inhibit signal;
- transmitting a synchronous signal to the relay control device, wherein the relay control device generates the relay control signal in response to the synchronous signal;
- and
- selectively transferring the ring signal to the subscriber telephone, in response to the relay control signal, from the ring signal generator initially is set at a low voltage level,
- wherein the low voltage level reduces generated switching noise and protects the relay from large initial voltage levels upon transition to the ring signal generator.
4 more elements
A method of signaling a subscriber telephone using a ring relay control unit of a foreign exchange station, the method comprising:
- generating a relay interrupt command from a main control unit;
- generating a relay control signal and a ring generation inhibit signal from a ring relay control device in response to the relay interrupt command from the main control unit;
- generating a ring signal with a ring signal generator to the subscriber telephone in response to the ring generation inhibit signal;
- and transmitting a synchronous signal to the relay control device, wherein the relay control device generates the relay control signal in response to the synchronous signal;
- and
- selectively transferring the ring signal to the subscriber telephone from the ring signal generator using a relay in response to the relay control signal,
- wherein the relay control device generates the relay control signal to interface the relay to the SLIC and transmits the ring generation inhibit signal to the ring signal generator if the relay interrupt command is received from the main control unit to interface the call signal to the subscriber telephone.
4 more elements
A ring relay control unit of a foreign exchange station for signaling a subscriber telephone, the ring relay control unit comprising:
- a main control unit for generating a relay interrupt command;
- a relay control device connected to the main control unit to generate a relay control signal and a ring generation inhibit signal in response to the relay interrupt command from the main control unit;
- a ring signal generator connected to the relay control device for generating a ring signal to the subscriber telephone in response to the ring generation inhibit signal, and for transmitting a synchronous signal to the relay control device, wherein the relay control device generates the relay control signal in response to the synchronous signal;
- a SLIC for interfacing a call signal to the subscriber telephone;
- and
- a relay for selectively transferring the call signal and the ring signal to the subscriber telephone from the ring signal generator in response to the relay control signal, wherein
- the relay control device comprises a first delay device to generate the relay control signal and a second delay device to generate the ring generation inhibit signal in response to the relay interrupt command from the main control unit and the synchronous signal from the ring control generator.
4 more elements
A ring relay control unit of a foreign exchange station for signaling a subscriber telephone, the ring relay control unit comprising:
- main control means for generating a relay interrupt command;
- relay control means for generating a relay control signal and a ring generation inhibit signal in response to the relay interrupt command from the main control unit;
- ring signal generating means for generating a ring signal to the subscriber telephone in response to the ring generation inhibit signal, and for transmitting a synchronous signal to the relay control means, wherein the relay control means generates the relay control signal in response to the synchronous signal;
- and
- switching means for selectively transferring the ring signal to the subscriber telephone from the ring signal generating means in response to the relay control signal, wherein
- the relay control means comprises a first delay means to generate the relay control signal and a second delay means to generate the ring generation inhibit signal in response to the relay interrupt command and the synchronous signal.
3 more elements
Dependencies are inferred from the claim text.