Collision detection apparatus utilizing tap means connected to each transmitting optical fiber for fiber optic Local Area Networks
US4580872A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1983 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Aug 17, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/44
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A fiber optic Local Area Network containing more than one transmitter-receiver combination capable of transmitting and receiving light energy over optical fibers and being deactivatable during transmission upon receiving a jam signal, a coupler means, a collision detection means for detecting when more than one transmitter is transmitting at the same time, and a plurality of optical fibers connecting the coupler means to said transmitter-receiver combinations and forming transmitting and receiving light paths there between, the collision-detection means comprising a tap means connected to each transmitting optical fiber for diverting a portion of the transmitted light energy; an optical receiver means for each optical fiber containing a tap adapted to detect that portion of an optical signal diverted by said tap means; an optical path between each tap means and a single optical receiver means; a logic means connected to said optical receiver means responsive to and adapted to transmit a predetermined signal when two or more simultaneously co-existing optical signals are detected in two or more optical receiver means; a jam signal means adapted to be activated by the predetermined s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.