Stand-alone transmission controller
US4855998A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1986 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Nov 21, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/433
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Disclosed is a stand-alone transmission controller equipped in each of many transmission control stations linked to form a looped data transmission system with the intention of implementing reliable data transfer on a stand-alone basis between optional stations. The controller consists of a signal detecting circuit which detects the presence or absence of a line employment permission signal on the transmission line, a transmission control circuit which sends out a line employment permission signal in response to the absence of the line employment permission signal from another station as detected by the signal detecting circuit on condition that the first station has the loop control priority, a transmitting control circuit which responds to the detection of a line employment permission signal from a station having the loop control priority to send out transmission data together with the detected signal on condition that the station has data to be sent, a reception control circuit which receives transmission data sent through the looped data transmission system and destined to the receiving station and sends out reception data with reception acknowledgement to the sending station a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.