ISDN terminal adapter for use with external modem and employing software-based serial communication framing for ISDN `D` channel signaling
US5903572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1997 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Sep 4, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/1332
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An ISDN terminal adapter is capable of providing both digital and analog communication connectivity between a customer's data terminal equipment (DTE) and a digital communication link. The adapter includes a digital (ISDN) communication transceiver for transmitting and receiving digital communication signals on the ISDN link. A first digital communication connector is coupled with the DTE. A second digital communication connector is coupled with the customer's modem. An analog communication connector is coupled with an analog port of the modem. An analog/digital communication interface is coupled between the analog communication connector and the digital communication transceiver. A serial communication exchange processor is coupled with the first and second digital communication connectors and the transceiver. For all-digital (ISDN) connectivity, the processor provides a first communication path, exclusive of the modem, between the first digital communication connector and the transceiver, so that digitally formatted communication may take place between the DTE and the ISDN link. For digital-analog connectivity, the processor provides a second communication path that makes use of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.