Distribution and amplification systems that automatically terminate to a matched termination in response to power interruptions and related methods
View Patent ↗Distribution and amplification systems for cable television networks include a tap unit having a first RF tap port and a second RF tap port, a voice-over IP (“VoIP”) RF signal amplifier and a non-VoIP RF signal amplifier. The VoIP RF signal amplifier is connected to the first RF tap port of the tap unit, and includes an amplified signal path and a passive, non-interruptible signal path. The non-VoIP RF signal amplifier is connected to the second RF tap port of the tap unit, and includes an amplified signal path. The VoIP and non-VoIP RF signal amplifiers are each configured to terminate their amplified signal paths to respective matched terminations in response to a power outage.
1. A distribution and amplification system for a cable television network, comprising:
a tap unit having a first RF tap port and a second RF tap port;
a voice-over IP (“VoIP”) RF signal amplifier that is connected to the first RF tap port of the tap unit, the VoIP RF signal amplifier including a first amplified signal path that connects an RF input port of the VoIP RF signal amplifier to a first RF output port of the VoIP RF signal amplifier and a second, passive, non-interruptible signal path that connects the RF input port of the VoIP RF signal amplifier to a second RF output port of the VoIP RF signal amplifier;
a non-VoIP RF signal amplifier that is connected to the second RF tap port of the tap unit, the non-VoIP RF signal amplifier including a first amplified signal path through the non-VoIP RF signal amplifier that connects an RF input port of the non-VoIP RF signal amplifier to a first RF output port of the non-VoIP RF signal amplifier;
wherein the VoIP RF signal amplifier is configured to terminate the first amplified signal path to a first matched termination when an electrical power feed to a power input of the VoIP RF signal amplifier is interrupted; and
wherein the non-VoIP RF signal amplifier is configured to terminate the first amplified signal path of the non-VoIP RF signal amplifier to second matched termination when the electrical power feed to a power input of the non-VoIP RF signal amplifier is interrupted.
2. The distribution and amplification system of claim 1 , wherein the VoIP RF signal amplifier includes a first switching device having an input that is coupled to the RF input port of the VoIP RF signal amplifier, a first output that is coupled to a first power amplifier of the VoIP RF signal amplifier, and a second output that is coupled to the first matched termination, and wherein the non-VoIP RF signal amplifier includes a second switching device having an input that is coupled to the RF input port of the non-VoIP RF signal amplifier, a first output that is coupled to a second power amplifier of the non-VoIP RF signal amplifier, and a second output that is coupled to the second matched termination.
3. The distribution and amplification system of claim 2 , wherein the VoIP RF signal amplifier further comprises a first directional coupler having an input that is coupled to the RF input port of the VoIP RF signal amplifier, a first output that is connected to the input of the first switching device and a second output that is connected to the second RF output port of the VoIP RF signal amplifier via the second passive, non-interruptible communication path.
4. The distribution and amplification system of claim 3 , wherein the VoIP RF signal amplifier further comprises:
a first diplexer that is coupled between the first output of the first switching device and the input of the first power amplifier; and
a second diplexer that is coupled between an output of the first power amplifier and the first RF output port.
5. The distribution and amplification system of claim 4 , wherein the non-VoIP RF signal amplifier further comprises:
a first diplexer that is coupled between the first output of the second switching device and the input of the second power amplifier; and
a second diplexer that is coupled between an output of the second power amplifier and the first RF output port of the non-VoIP RF signal amplifier.
6. The distribution and amplification system of claim 5 , wherein the tap unit includes a tap directional coupler that has a first output that is connected to the first RF tap port and a second output that is connected to the second RF tap port, and wherein the VoIP RF signal amplifier is connected to the first RF tap via a first cable and the non-VoIP RF signal amplifier is connected to the second RF tap via a second cable.
7. The distribution and amplification system of claim 6 , wherein the VoIP RF signal amplifier is connected to a first premise of a first subscriber who receives Internet telephone or lifeline service, and wherein the non-VoIP RF signal amplifier is connected to a second premise of a second subscriber who does not receive Internet telephone or lifeline service.
8. The distribution and amplification system of claim 7 , wherein the first and second premises are both within the same multi-dwelling unit.
9. The distribution and amplification system of claim 7 , wherein the first matched termination comprises a first resistor that is terminated to a ground voltage and wherein the second matched termination comprises a second resistor that is terminated to the ground voltage.
10. The distribution and amplification system of claim 7 , further comprising a first power regulation circuit that receives electrical power from the power input of the VoIP RF signal amplifier and that outputs a first power supply voltage to the first power amplifier and the first switching device, and a second power regulation circuit that receives electrical power from the power input of the non-VoIP RF signal amplifier and that outputs a second power supply voltage to the second power amplifier and the second switching device.
11. The distribution and amplification system of claim 7 , wherein the directional coupler splits an input signal evenly between its first output and its second output.
12. The distribution and amplification system of claim 7 , wherein the first amplified signal path includes a forward path that carries RF signals from the RF input port to the first RF output port, the forward path including the first power amplifier, and a reverse path that carries RF signals from the first RF output port to the RF input port.
13. The distribution and amplification system of claim 12 , further comprising a third power amplifier that is part of the reverse path.
14. A method of providing subscription services to first and second subscriber premise of a multi-dwelling unit over a cable television network, the method comprising:
installing a tap unit that includes a first RF tap port and a second RF tap port on a communications line of the cable television network;
connecting a VoIP RF signal amplifier to the first RF tap port;
connecting a non-VoIP RF signal amplifier to the second RF tap port;
providing a first subscription service to the first subscriber premise through a first amplified signal path through the VoIP RF signal amplifier and providing a second subscription service through a second signal path through the VoIP RF signal amplifier to the first subscriber premise when electrical power is received at a power input of the VoIP RF signal amplifier;
providing a third subscription service to the second subscriber premise through a first amplified signal path through the non-VoIP RF signal amplifier when electrical power is received at a power input of the non-VoIP RF signal amplifier;
automatically terminating the first amplified signal path of the VoIP RF signal amplifier to a first matched termination in response to the electrical power feed to the VoIP RF signal amplifier being interrupted; and
automatically terminating the first amplified signal path of the non-VoIP RF signal amplifier to a second matched termination in response to the electrical power feed to the non-VoIP RF signal amplifier being interrupted.
15. The method of claim 14 , wherein the VoIP RF signal amplifier includes a first switching device that has first input that is coupled to the first RF tap port, a first output that is coupled to a first power amplifier and a second switch output that is coupled to the first matched termination, and wherein automatically terminating the first amplified signal path of the VoIP RF signal amplifier to the first matched termination in response to the electrical power feed to the VoIP RF signal amplifier being interrupted comprises connecting the first input of the first switching device to the second output of the first switching device in response to the electrical power feed to the VoIP RF signal amplifier being interrupted.
16. The method of claim 15 wherein the non-VoIP RF signal amplifier includes a second switching device that has first input that is coupled to the second RF tap port, a first output that is coupled to a second power amplifier and a second switch output that is coupled to the second matched termination, and wherein automatically terminating the first amplified signal path of the non-VoIP RF signal amplifier to the second matched termination in response to the electrical power feed to the non-VoIP RF signal amplifier being interrupted comprises connecting the first input of the second switching device to the second output of the second switching device in response to the electrical power feed to the non-VoIP RF signal amplifier being interrupted.
17. The method of claim 16 , wherein the first matched termination comprises a first resistor that is terminated to a ground voltage and the second matched termination comprises a second resistor that is terminated to the ground voltage.
18. The method of claim 17 , further comprising automatically resetting the first switching device to connect the switch input to the first switch output in response to the electrical power feed to the VoIP RF signal amplifier being restored.
19. The method of claim 18 , further comprising automatically resetting the second switching device to connect the switch input to the first switch output in response to the electrical power feed to the non-VoIP RF signal amplifier being restored.
20. The method of claim 14 , wherein the first subscription service is the same as the third subscription service.