Distribution network comprising coax and optical fiber paths for transmission of television and additional signals
US5499047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Nov 28, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cable television network is supplemented with optical fibers and fiber termination units to communicate additional downstream digital signals and upstream signals. A drop unit for each customer premises is provided in the drop cable. The drop unit demodulates downstream signals and selects for delivery to the customer premises only those downstream signals addressed to the customer premises, modulating the selected signals using binary phase shift keying (BPSK) which provides relative immunity to noise for forwarding the signals to the customer premises. Upstream BPSK signals from the customer premises are demodulated and remodulated in the drop unit to isolate the customer premises wiring from the rest of the network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.