Load coil device
US6546100B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1998 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Dec 3, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/1708
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A load coil device for a twisted pair telephone line is disclosed. The device is for compensating distributed stray capacitance in telephone lines that are longer the 18,000 feet. Typically, a load coil device would be inserted in the line every 6,000 feet. The device includes two windings, each winding to be connected in series with one of the conductors of the telephone line. The windings flatten the frequency response of the line in the voice frequency (VF) band. The device further has a capacitor connected in parallel across each winding. The values of the capacitors are chosen to provide a low impedance path that bypasses the windings for frequencies in the range of 20 kHz to 1.1 MHz. The device is particularly useful for long telephone lines over which high speed services such as asynchronous digital subscriber line (ADSL) are to be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.