Splitterless modem using harmonics reduction
US6456650B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/062
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a splitterless Digital Subscriber Line (DSL) modem 30, a receiver architecture (100) that permits monitoring of harmonics within the upstream channel of a DSL connection. The receiver (100) can detect the harmonics by monitoring the harmonics in some empty tones or specified tones. A threshold can be set to differ the normal noise power and harmonics power in those empty or specified tones. When a POTS device (10) coupled to same wire line pair (20) as the DSL modem (30) goes off-hook, the DSL modem (30) can switch from the normal state to an off-hook state in which the harmonics are reduced to minimum by transmitting only the upper sub-band tones of the upstream transmission channel at reduced power levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.