Loop transmission system
US4500987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Nov 23, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/433
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a loop transmission system in which packet communications are made among a plurality of transmission/reception terminals which are connected in a loop, a higher degree of priority is given to a real time signal packet, while a lower degree of priority is given to a data packet. A communication path in each terminal is controlled according to the degree of priority such that a packet having a higher degree of priority will not be delayed when it passes through the terminal. Further, a transmission request command signal having an intermediate degree of priority is sent for effecting a real time signal transmission as well as full dual communication. In a modified embodiment, a traffic quantity detector is provided for sending out a real time information message. In another modification, an activity control circuit is added for controlling sending out of the voice packet according to a detected traffic quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.