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 internet telephone. The RF packets can be derived from analog RF signals that are produced by legacy video service terminals. In...http://www.google.se/patents/US7986880?utm_source=gb-gplus-sharePatent US7986880 - Method and system for providing a return path for signals generated by legacy terminals in an optical network
