Ronja

Ronja may refer to: * Ronia, the Robber's Daughter (Ronja Rövardotter), a children's book by Astrid Lindgren * Reasonable Optical Near Joint Access, an optical point-to-point Free Space Optics data link * Ronja (given name), the name Ronja.

with a cheap loupe lens creates a bright narrow beam that can stream DVD-quality video over neighbourhoods. The red beam is invisible when observed outside of its unobstructed path. RONJA (Reasonable Optical Near Joint Access) is a free-space optical communication system developed in the Czech Republic by Karel Kulhavý of Twibright Labs. Released in 2001¹. It transmits data Wirelessly using beams of light. Ronja can be used to create a 10 Mbit/s full duplex Ethernet point-to-point link. It has been estimated that 1,000 to 2,000 links have been built worldwide. The basic configuration has a range of . The device consists of a receiver and transmitter pipe (optical head) mounted on a sturdy adjustable holder. Two coaxial cables are used to connect the rooftop installation with a protocol translator installed in the house near a computer or switch. By increasing the diameter of the lens and transmitter pipe diameter, the range can be extended to 1.9 km (1.2 mi) . Building instructions, blueprints, and schematics are published under the GNU Free Documentation License, with development using only free software tools. The author calls this approach "User Controlled Technology", emphasising their view on the importance of open-source and user-driven software and innovation Unstrung: Da Doo Ron RONJA Ronja talk at WSFII London 2005 (archive.org) Hack a Day: Ronja Building a Ronja-lightlink: A User Testimonial (web.archive.org) The 3D modeling software BRL-CAD, originally developed by the US Army since 1979, showcases Ronja as a project which uses BRL-CAD Phanumas Khumsat, Noppadol Wattanapisit, Karel Kulhavey, "Low-Cost Laser-Based Wireless Optical Transceiver for 10-Mbps Ethernet Link", Proceedings of IEEE Region 10 Conference (TENCON), Hong Kong, China (2006), which publishes the Ronja design with minor modifications, publishes the Ronja receiver and transmitter schematics virtually unchanged, and features a photograph of a Ronja Twister built on the official Ronja PCB. Phanumas Khumsat, Noppadol Wattanapisit, Karel Kulhavey, "Optical Front-Ends for Low-Cost Laser-Based 10-Mbps Free-Space Optical Transceiver" (full text), Proceeding of IEEE Asia Pacific Conference on Circuits and Systems 2006, 1911–1914 (2006), which publishes the Ronja design with minor modifications, publishes the Ronja receiver and transmitter schematics virtually unchanged, and features a photograph of the official Ronja optical heads and holders. I. Rukovanský, M. Horváth, L. Solárik, P. Cícha: Computer Networks (in Czech), a university lecture textbook, European Polytechnic Institute – a Private University, 2015, pages 66–67 Johan Söderberg: Free software to open hardware: Critical theory on the frontiers of hacking, Doctoral Dissertation, University of Gothenburg, , Sweden, 2011. David Němec: Cableless optical transmission (in Czech), Master diploma thesis, Institute of Telecommunications, Faculty of Electrical Engineering and Communication, Brno, Czech Republic, 2012. Santi Phasuk (สันติ ผาสุข): Design and Implementation of a Data Transceiver via Visible Light Beam (in Thai with English abstract), Master Thesis, Kasetsart University, Bangkok, Thailand, 2011. B. Bakala: Realization of Optical Link, Bachelor project, Department of Telecommunication Engineering, Czech Technical University, Prague, Czech Republic, 2011. Jan Matyáš: FPGA-Based Ronja Twister (full text), Bachelor's Thesis, Department of Computer Systems, Faculty of Information Technology, Brno University of Technology, Czech Republic, 2011. Bc. Lukáš Chobot: Wireless data transfer via optical modules (in Czech), Diploma Thesis, Faculty of Applied Computer Science, Tomas Bata University, Zlín, Czech Republic, 2011. Bc. Filip Němec: Optical Cableless Transmission (in Czech), Master's Thesis, Department of Telecommunications, Faculty of Electrical Engineering and Communication, Brno University of Technology, Czech Republic, 2010. T. Szabo: Design and realization of wireless optical connection RONJA (mentioned in annual report), Master thesis, Department of Telecommunications, Faculty of Electrical Engineering and Information, Slovak University Of Technology in Bratislava, Slovakia, 2007. Bc. Ľubomír Adámek: Wireless Data Transmission (in Czech), Diploma Thesis, Faculty of Applied Computer Science, Tomas Bata University, Zlín, Czech Republic, 2006. Libor Štěpán: Wireless Optical Link for LAN Ethernet (in Czech), Bachelor Thesis, Faculty of Applied Computer Science, Tomas Bata University, Zlín, Czech Republic, 2006. M. A. Chancey: Short Range Underwater Optical Communication Links (full text), Master Thesis, North Carolina State University, USA, 2005. RONJA Adaptation for Underwater British council project – Promotion of ronja in community networks in UK 2004

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