ISDN interface unit with separate ring generator
US5563943A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1995 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Apr 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/36
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An ISDN interface unit interconnects a data processing unit, an ISDN, and an analog telephone and includes a ring sound controller for supplying a control signal to designate a generation of a ring of the analog telephone through a modular jack; a ring signal generator generating a ring sound; a switch selecting one of the ring sounds generated and supplying the ring sound to the analog telephone. Further, the ISDN interface unit comprises communication functions for the digital signal and for the voice band signal, a control channel signal sent from the ISDN line is interpreted, and one of the communication functions can be selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.