Apparatus for interfacing analog telephones and digital data terminals to an
US5305312A · kind A · utility
312Cited by
9References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1992 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Feb 7, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/299
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An interface to an integrated service, digital network (ISDN) line for up to two analog dual tone, multifrequency telephones and up to four personal computers or data terminals. A stored program-controlled processor controls access to the ISDN line for the analog and digital interface circuits. The processor also provides access to switch-controlled ISDN features for the analog telephones (e.g., call waiting, call hold, etc.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.