INTERCOM TRANSCEIVER WITH FIBER OPTIC LINK

• US 20160112130A1
• Filed: 08/19/2015
• Published: 04/21/2016
• Est. Priority Date: 04/26/2012
• Status: Active Grant

• Current Assignee: Grass Valley Canada (Belden Inc.)
• Original Assignee: Miranda Technologies Partnership
• Inventors: Hurwitz, James Bennett, Pelletier, David Charles
• Granted Patent: US 10,050,707 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 10/2575 Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
• CPC Class Codes: H04B 10/25751 Optical arrangements for CATV or video distribution adaptations of television systems for optical transmission H04N7/22
• CPC Class Codes: H04B 10/2589 Bidirectional transmission
• CPC Class Codes: H04J 2203/0001 Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
• CPC Class Codes: H04M 11/025 Door telephones adapted for television H04N7/186

Abstract

A system and method for carrying a downstream optical signal and an upstream optical signal on a fiber optic link is disclosed. The system and method includes a first transceiver unit that receives an input communication signal from at least one external communication device at an electrical input port, a transmitter that converts the input communication signal into an optical signal and transmits the optical signal as an downstream optical signal on a fiber optic link, a receiver at the second transceiver unit that receives the downstream optical signal and converts the downstream optical signal into an electrical communication signal, and a first circuit in the second transceiver unit that determines whether the second transceiver couples the electrical communication signal to a two wire intercom circuit or a four wire intercom circuit.

Claims

1. A system receiving a downstream optical signal at a transceiver unit coupled to an intercom system, the system comprising:

a receiver at a transceiver unit that receives a downstream optical signal and converts the downstream optical signal into an electrical communication signal;

a first circuit in the transceiver unit that determines whether the transceiver unit couples the electrical communication signal to a two wire intercom circuit or a four wire intercom circuit; and

an output port on the transceiver unit that outputs either a two wire intercom signal or a four wire intercom signal to an external communication device based on the first circuit determination.

2. The system of claim 1, wherein the determination of the first circuit is based on a switch position of a first switch of the transceiver unit.

3. The system of claim 1, further comprising:

a second circuit in the transceiver unit that selects a communication protocol for the electrical communication signal based on a switch position of a second switch of the transceiver unit.

4. The system of claim 1, further comprising:

a third circuit in the transceiver unit that determines whether the transceiver unit couples the electrical communication signal to a four wire intercom station circuit or a four wire intercom matrix circuit in the case that the first circuit determines the electrical communication signal is coupled to a four wire intercom circuit based on a switch position of a third switch of the transceiver unit.

5. The system of claim 1, further comprising:

a fourth circuit in the transceiver unit that determines a power source for an external communication device coupled to the electrical communication signal in the case that the first circuit determines the electrical communication signal is coupled to a two wire intercom circuit based on a switch position of a fourth switch of the transceiver unit.

6. The system of claim 1, further comprising a battery contained within the exterior surface of the transceiver unit.

7. The system of claim 1, further comprising an external direct current power supply.

8. The system of claim 1, further comprising an input port coupled to an optical transmitter on the transceiver unit that converts an input electrical communication signal into an upstream optical signal.

9. The system of claim 8, further comprising a wavelength division multiplexer for multiplexing the downstream optical signal and the upstream optical signal to permit bidirectional communication.

10. The system of claim 9, further comprising a wavelength division demultiplexer for separating the downstream optical signal from the upstream optical signal.

12. The method of claim 1, wherein the setting of the first circuit comprises a switch position of a first switch of the transceiver unit.

11. A method of receiving a downstream optical signal at a transceiver unit coupled to an intercom system, the method comprising:

receiving a downstream optical signal at a transceiver unit;

converting the downstream optical signal into an electrical communication signal;

coupling the electrical communication signal to one of a two wire intercom circuit and a four wire intercom circuit, responsive to a setting of a first circuit; and

transmitting the electrical signal to an external communication device as either a two wire intercom signal or a four wire intercom signal, based on the setting of the first circuit.

13. The method of claim 11, further comprising determining a communication protocol for the electrical communication signal, by a second circuit in the transceiver unit, based on a switch position of a second switch of the transceiver unit.

14. The method of claim 11, further comprising determining, by a third circuit in the transceiver unit, whether the transceiver unit couples the electrical communication signal to a four wire intercom station circuit or a four wire intercom matrix circuit in the case that the first circuit determines the electrical communication signal is coupled to a four wire intercom circuit based on a switch position of a third switch of the transceiver unit.

15. The method of claim 11, further comprising selecting, by a fourth circuit in the transceiver unit, a power source for an external communication device coupled to the electrical communication signal in the case that the first circuit determines the electrical communication signal is coupled to a two wire intercom circuit based on a switch position of a fourth switch of the transceiver unit.

16. The method of claim 15, wherein the selected power source comprises a battery contained within the exterior surface of the transceiver unit.

17. The method of claim 15, wherein the selected power source comprises an external direct current power supply.

18. The method of claim 11, further comprising converting an input electrical communication signal into an upstream optical signal, by an input port coupled to an optical transmitter on the transceiver unit.

19. The method of claim 18, further comprising multiplexing the downstream optical signal and the upstream optical signal to permit bidirectional communication, by a wavelength division multiplexer of the transceiver unit.

20. The method of claim 19, further comprising separating the downstream optical signal from the upstream optical signal, by a wavelength division demultiplexer of the transceiver unit.