ronja optical datalink - lugs · 2005. 6. 29. · 1998: experiments with ir 115.2kbaud 2004: –...
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RONJA
Optical datalink
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● 1998: Experiments with IR 115.2kBaud
● 2004:– 10Mbps– Full duplex– 1.4km range
● User Controlled Technology (UCT)
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Prehistory: Heliograph
● 405 B.C. Ancient Greeks● 1910● -1960
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Aldis Lamp
● Late 19th century – 1997
● Naval radio silence, early ATC
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Simple encoding
● ½ sec. Light, ½ sec. Dark -> logical 0● ½ sec. Dark, ½ sec. Light -> logical 1● Speed up 10,000x : 10Base ethernet
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Transmitter
● LED + 13cm lens, 17mW of light● Unconditionally eye safe● 10MBaud, 100% depth● 14' divergence● 4m spot @ 1km
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Advantages
● No interference● No spectrum regulation● No electrosmog● Difficult eavesdropping● Smooth throughput● Full duplex● BER 109
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Disadvantages
● Dropouts on fog● Mount requirements● PtP topology only● Range limited by extinction● Mechanics: 1020kg
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Range
● Rain OK● Visibility = 17dB attenuation of light● Divergence 4mrad FWHM● 1.4km range @4km visibility● Stable, given by white noise from Sun
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● Reliability● Throughput● Special SW requirements
– Immediate dropout detection
Ronja + WiFi backup
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Mechanical mounting
● Holder with fine and rough alignment● 5 types of console
– Chimney– Parallel– Perpendicular– Mast– Corner
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Manufacture
● DIY● PCB in a factory● Manual population● Drilling, cutting, painting etc.● Various operations can be ordered
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Installations
● 96 registered installations● 54 km total length● 9 countries
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Nearest Installation
Lausanne300m, since 2003
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Installatios by country
Czech 70
Slovakia 11
Romania 4Hungary 2Switzerland 1Russia 1Brazil 1Croatia 1Spain 1Latvia 1Poland 1
96 total
Czech
Slovakia
Romania
Hungary
Switzerland
Russia
Brazil
Croatia
Spain
Latvia
Poland
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Top 4 cities
Prague, CZ 29
Pardubice, CZ 18
Bratislava, SK 5
Buzau, RO 4
Cities with largest installation counts
Prague, CZ
Pardubice, CZ
Bratislava, SK
Buzau, RO
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BRL-CAD
● Devel since 1979 by U. S. Army● Since Dec 2004 continues as free SW
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CSG modelling
● OR, AND, SUB on solid bodies● Cylinder, box, sphere, torus, cone,...● Weight etc. natively calculated
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2D Drafting
● QCAD free SW● Swiss● DXF format● Sketches: Sodipodi
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Schematics
● gEDA gschem● Free SW● ASCII file format● Guile scripting
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PCB design
● Free SW “PCB”● ASCII file● Up to 8 layers● Soldermask● Silkscreen● Gerber RS274-X●
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Scientific data visualisation
● Eye safety data● Range & gain● Oscilloscope waveforms● Packetloss benchmarks● gnuplot● GNU R
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Web
● Apache● PHP● Rsync
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Infrastructure
● GNU Make● Perl scripts● GNU Arch
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End