Data transmission system
US4048446A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1975 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Dec 3, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/025
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A plurality of subscriber stations and a plurality of switching points are connected in series in a loop circuit transmitting signals in one direction, parallel line sections disposed in parallel with the loop circuit are each connected with two switching points and each switching point contains a switch controlled by a failure detector and adapted for switching between a loop circuit section and a parallel line section. The transmission direction of the parallel line sections corresponds to the direction of the loop circuit; an incoming parallel line section which by-passes one or two immediately preceding switching points and an out-going parallel line section which by-passes one or two immediately succeeding switching points are connected to each switching point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.