RONJA

Optical datalink

1998: Experiments with IR 115.2kBaud

2004:

10Mbps

Full duplex

1.4km range

User Controlled Technology (UCT)

Prehistory: Heliograph

405 B.C. Ancient Greeks

1910

-1960

Aldis Lamp

Late 19th century – 1997

Naval radio silence, early ATC

Simple encoding

½ sec. Light, ½ sec. Dark -> logical 0

½ sec. Dark, ½ sec. Light -> logical 1

Speed up 10,000x : 10Base ethernet

Transmitter

LED + 13cm lens, 17mW of light

Unconditionally eye safe

10MBaud, 100% depth

14' divergence

4m spot @ 1km

Advantages

No interference

No spectrum regulation

No electrosmog

Difficult eavesdropping

Smooth throughput

Full duplex

BER 10-9

Disadvantages

Dropouts on fog

Mount requirements

PtP topology only

Range limited by extinction

Mechanics: 10-20kg

Range

Rain OK

Visibility = 17dB attenuation of light

Divergence 4mrad FWHM

1.4km range @4km visibility

Stable, given by white noise from Sun

Reliability

Throughput

Special SW requirements

Immediate dropout detection

Ronja + WiFi backup

Mechanical mounting

Holder with fine and rough alignment

5 types of console

Chimney

Parallel

Perpendicular

Mast

Corner

Manufacture

DIY

PCB in a factory

Manual population

Drilling, cutting, painting etc.

Various operations can be ordered

Installations

96 registered installations

54 km total length

9 countries

Nearest Installation

Lausanne

300m, since 2003

Installatios by country

Top 4 cities

BRL-CAD

Devel since 1979 by U. S. Army

Since Dec 2004 continues as free SW

CSG modelling

OR, AND, SUB on solid bodies

Cylinder, box, sphere, torus, cone,...

Weight etc. natively calculated

2D Drafting

QCAD free SW

Swiss

DXF format

Sketches: Sodipodi

Schematics

gEDA gschem

Free SW

ASCII file format

Guile scripting

PCB design

Free SW “PCB”

ASCII file

Up to 8 layers

Soldermask

Silkscreen

Gerber RS274-X

Scientific data visualisation

Eye safety data

Range & gain

Oscilloscope waveforms

Packetloss benchmarks

gnuplot

GNU R

Web

Apache

PHP

Rsync

Infrastructure

GNU Make

Perl scripts

GNU Arch

End

Ronja Optical Datalink

2005-06-04T16:40:55