Method and system for scanning for a downstream channel in a communication network
US7916744B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 2007 |
| Grant date | Mar 29, 2011 |
| Priority date | — |
| Expiry date | Jul 26, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6168
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A predetermined current frequency is selected for a cable modem or embedded media terminal adapter to evaluate for presence of a CMTS signal. A determination is made whether the current frequency carries signal energy as opposed to just noise. If no signal energy is detected, the current frequency is changed by ½ of a channel width to a new frequency, which becomes the current frequency, and the determination is re-performed. If the determination of the current frequency indicates that signal energy is present, but not CMTS energy, then a new frequency indicates that selected that differs from the current frequency by 1 MHz. If the determination at the current frequency indicates that CMTS signal energy is present, but QAM lock cannot be achieved, then a new frequency is selected by changing from the current frequency by a full channel width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.