Automatic synchronous/asynchronous modem
US4715044A · kind A · utility
15Cited by
7References
12Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Jul 3, 1986 |
| Grant date | Dec 22, 1987 |
| Priority date | — |
| Expiry date | Jul 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
There is disclosed an arrangement which enables a single modem port to be used for either synchronous or asynchronous data transmission, with no manual changes required. The modem determines whether the incoming call is synchronous or asynchronous by detecting the presence (or absence) of SYNC characters in the data stream immediately after handshaking. Once a determination has been made, the modem options itself accordingly for synchronous or asynchronous data handling. This arrangement eliminates the need for separate central office lines for synchronous and asynchronous data applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.