Method and system for providing a return path for signals generated by legacy terminals in an optical network
View Patent ↗A return path system includes inserting RF packets between regular upstream data packets, where the data packets are generated by communication devices such as a computer or interne telephone. The RF packets can be derived from analog RF signals that are produced by legacy video service terminals. In this way, the present invention can provide an RF return path for legacy terminals that shares a return path for regular data packets in an optical network architecture.
1. A return path for RF-modulated video service control signals comprising:
a subscriber optical interface for receiving upstream RF-modulated video service control signals in the electrical domain, the subscriber optical interface comprising an RF diplexer, the RF diplexer comprising a first RF filter for passing the upstream RF-modulated video service control signals in the electrical RF domain and blocking any extraneous RF-modulated signals, the RF diplexer comprising a second filter for passing downstream RF-modulated video signals in the electrical RF domain and blocking any extraneous RF-modulated signals, the first RF filter having an output port coupled to an input port of an A/D converter, the A/D converter for converting the upstream RF-modulated video service control signals to digital signals, the subscriber optical interface modulating an optical carrier with the digital signals for generating optical signals according to a timing dependent protocol and which are sent upstream relative to the subscriber optical interface.
2. The return path of claim 1 , wherein subscriber optical interface receives downstream optical signals and transmits the downstream RF-modulated video service control signals in the electrical domain.
3. The return path of claim 1 , wherein the RF-modulated video service control signals in the electrical domain are propagated according to one of a contention network protocol and a query-response protocol, the contention network protocol and query-response protocol supporting the control signals independently of time.
4. The return path of claim 1 , wherein the video service control signals comprise one or more commands for managing video programming that is displayable on a display device.
5. The return path of claim 2 , further comprising a data service hub for generating the downstream optical signals received by the subscriber optical interface and for transmitting downstream RF-modulated video service control signals modulated in the downstream optical signals.
6. The return path of claim 5 , wherein the data service hub comprises a video service control terminal for generating the downstream RF-modulated video service control signals.
7. The return path of claim 1 , wherein the subscriber optical interface comprises a data scaling unit for reducing data contained within the digital signals.
8. The return path of claim 1 , wherein the digital signals comprise first digital packets, the subscriber optical interface combining the first digital packets with second digital packets in the time domain and according to the timing dependent protocol for upstream transmission of the combined first and second packets.
9. The return path of claim 1 , further comprising one or more optical waveguides connected to the subscriber optical interface, for carrying the upstream optical signals and downstream optical signals.
10. The return path of claim 8 , wherein the second packets comprise data other than the RF-modulated video service control signals.
11. A method for providing a return path for RF-modulated video service signals in an optical network system comprising:
receiving one or more upstream RF-modulated video service control signals with a subscriber optical interface;
receiving one or more downstream RF-modulated video signals with the subscriber optical interface;
filtering the upstream RF-modulated video service control signals in the electrical RF domain with a first analog RF filter;
blocking any extraneous upstream RF-modulated signals with the first analog RF filter;
feeding an output of the RF filter into an input of an A/D converter;
filtering the downstream RF-modulated video signals in the electrical domain with a second analog RF filter;
blocking any extraneous downstream RF-modulated signals with the second analog RF filter;
converting the one or more upstream RF-modulated video service control signals to digital signals with the A/D converter; and
propagating the digital signals upstream with an optical carrier according to a timing dependent protocol.
12. The method of claim 11 , wherein the video service control signals comprise upstream control information that are propagated according to one of a contention network protocol and a query-response protocol, the contention network protocol and query-response protocol supporting the control information independently of time.
13. The method of claim 12 , wherein the video service control signals comprise one or more commands for managing video programming that is displayable on a display device.
14. The method of claim 11 , further comprising converting digital signals to first digital information packets, and receiving a plurality of second digital information packets.
15. The method of claim 14 , further comprising transmitting the first and second digital information packets by inserting the first digital information packet between the second digital information packets during a time interval.
16. The method of claim 11 , further comprising generating downstream optical signals and transmitting the downstream RF-modulated video service control signals to the subscriber optical interface with a data service hub.
17. A method for returning RF signals from a subscriber in an optical network comprising:
receiving modulated upstream RF video service control signals in the electrical domain with a subscriber optical interface;
receiving one or more downstream RF-modulated video signals with the subscriber optical interface;
filtering the modulated upstream RF video service control signals in the electrical RF domain with a first analog RF filter;
blocking any extraneous upstream RF-modulated signals with the first analog RF filter;
filtering the downstream RF-modulated video signals in the electrical domain with a second analog RF filter;
blocking any extraneous downstream RF-modulated signals with the second analog RF filter;
feeding an output of the first analog RF filter into an input of an A/D converter;
converting the upstream RF video service control signals into digitized RF signals with the A/D converter of the subscriber optical interface;
processing the digitized RF signals with the subscriber optical interface;
converting the processed digitized RF signals into one or more packets with the subscriber optical interface; and
propagating the packets towards a data service hub with an optical carrier according to a timing dependent protocol.
18. The method of claim 17 , wherein the upstream RF video service control signals are propagated according to one of a contention network protocol and a query-response protocol, the contention network protocol and query-response protocol supporting the RF video service control signals independently of time.
19. The method of claim 17 , wherein the video service control signals comprise one or more commands for managing video programming that is displayable on a display device.
20. The method of claim 17 , further comprising reducing the amount of data contained in the digitized RF signals with a data scaling unit.