Synchronous/asynchronous modem
US4700358A · kind A · utility
48Cited by
17References
73Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1985 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Nov 18, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/385
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved modem is described which can selectably operate in a synchronous communications mode, an asynchronous data mode, and an asynchronous command mode. A processor 47 controls the operation of the modem, adds starting and ending flags and frame check sequences to transmitted data, searches for flags and sync characters in received data, adds and deletes start, stop and parity bits required for communications with the asynchronous communications element 18, and performs zero bit insertion and deletion for HDLC/SDLC communications. Processor 47 also controls and monitors the operating parameters of the modem engine 60.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.