Signaling system
US7536004B2 · kind B2 · utility
3Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2002 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Mar 22, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/6033
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Standard telephone handset ports provide a bias voltage for any attached peripheral devices. The present invention provides bi-directional control signaling where telephone sets vary the bias voltage for detection by peripheral devices and where the peripheral devices provide short, load, and no-load conditions for detection by the telephone sets using the bias voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.