Signal generation and synchronizing circuit for a decentralized ring network
US4495617A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Sep 9, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/422
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A circuit for signal generation and synchronization is disclosed for a ring network in which a number of stations communicate with each other. The circuit, which is provided at each station in the ring, includes a phase locked loop which loosely couples the transmit and receive clocks of each station during a repeater mode of operation. During a transmit mode the receive and transmit clocks are de-coupled so that phase delay around the ring does not degrade the transmit clock each time a transmission is initiated. The circuit includes logic gates for detecting the transmission of a token, means for generating a token and means for jam syncing the transmit and receive clocks to detect transistions in the incoming data during the repeater mode and after a token has been generated at the end of the transmit mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.