Hybrid fiber-coax system having at least one digital fiber node and increased upstream and downstream bandwidth
US5864748A · kind A · utility
31Cited by
11References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1996 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Sep 18, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/17309
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Noise is reduced and bandwidth may be increased in a CATV transmission system by modulating a portion of subscriber-generated upstream signals to a high frequency band (e.g., 750-100 MHz) and then digitally regenerating such signals. To further reduce noise, the digitally regenerated upstream signals are transmitted by in a baseband digital format to the head end (120) via a digital E/O converter (330). Increased downstream bandwidth is obtained by modulating a portion of the downstream signals to a higher frequency band (e.g., 500-750 MHz) and then digitally regenerating such signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.