Open loop system for transmitting digital information
US4119804A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Mar 24, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/025
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A plurality of subscriber stations is connected to one or more PCM multiplex lines of a PCM switching network via a unidirectional loop and a transfer station. The subscriber stations are series connected to the loop on which addressed telegrams circulate originating and ending at the transfer station. The subscriber stations receive the telegrams addressed to them and exchange them for transmission to the transfer station. The transfer station transmits a time-slot received on the PCM line as an addressed telegram and vice-versa. For enhancing reliability all subscribers can be connected via a second loop and a second transfer station to one or more further PCM lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.