Asynchronous-to-synchronous data concentration system
US4048440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Nov 8, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Asynchronous character-oriented (start-stop) data are transmitted through a synchronous transmission channel at a rate which can exceed the synchronous rate. The excess data rate is accomplished in an input buffer at the transmitter by suppressing occasional stop bits in proportion to the difference between synchronous and asynchronous rates. An output buffer at the receiver detects start bits and thereafter monitors the presence or absence of stop bits. When a stop bit is absent, the output buffer restores it before delivering the character to the data user. Special control signals not organized into characters, such as, all-space signals are also monitored at both transmitter and receiver to insure that stop bits are not spuriously inserted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.