Method and device for decentralized transmission of data on a transmission line
US5227907A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1990 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Jun 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/28
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Every subscriber node connected to an optical fiber comprises an access unit with a directional coupler which is controlled via an output amplifier, an optoelectric converter being connected subsequent to the directional coupler. Packets run on the fiber. The first bit of the packets indicates whether it is an empty packet (shown by "light" or "bright") or a data packet (shown by "no light" or "dark"). As soon as the node has prepared data for transmission in a buffer storage, a test is effected at each arriving packet as to whether or not it is an empty packet. For this purpose, the light of every first bit is guided to a L/I detector which carries out this test in a "flying" manner, while a no-light bit passes on to the outgoing fiber. If the L/I bit indicates a data packet, the control immediately switches the directional coupler to pass, so that the packet passes the node so as to be unchanged. On the other hand, if the L/I bit indicates an empty packet, the contents of the buffer storage is read into this packet. The node cane accordingly transmit without the slightest time delay occurring in the packet stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.