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text_fgcolour=0,255,0
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title_font=/usr/share/fonts/truetype/ttf-bitstream-vera/VeraBd.ttf
code_font=/usr/share/fonts/truetype/ttf-bitstream-vera/VeraMono.ttf
---
!IMG|Green_and_white_machine.jpg|Child Per One Laptop
---
=One Laptop Per Child
-saw call for help
-hmm, rural radio testing
-plan written and submitted
-plan accepted
-stuff arrived
---
=A-Test
-bare boards
-no keyboard, use USB
-no touchpad, use USB
-no display, use VGA
-no battery, use 12V DC
-no canning
-can run netrek
---
!IMG|Reva_infineon_highlight_small.jpg|A-Test
---
=A-Test Results
-<installed new builds fine
-<migration from supplied BIOS to LinuxBIOS
-<migration to OpenFirmware
-<nominal wireless results, 20m indoors
-<assisted with RAM cycle time testing
---
=B-Test-1
-<complete units
-<intentionally lacking in some areas
-<assisted with battery management
-<assisted with radio range testing
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!IMG|/home/james/james/pix/in/2007-01-10-14-23-21/s08-285x.jpg
---
=Range Test 1 Configuration
-<only one unit
-<access point on ladder
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!IMG|/home/james/james/pix/in/2006-12-12-19-51-46/s08-265x.jpg
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!IMG|/home/james/james/pix/in/2006-12-12-19-52-51/s08-269x.jpg
---
ladder fell down in wind
-unit carried on 3km walk
-GPS distance measurement
-in managed mode
---
!IMG|/home/james/james/pix/in/2006-12-12-19-51-46/s08-267x.jpg
---
=Range Test 1 Results
-400m fine
-700m dodgy
-1.5km quite dodgy
-terrain obstruction obvious
---
=Range Test 2 Configuration
-access point under eaves
-tester and scribe
-each of three units
-specific test locations
-GPS distance measurement
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=Range Test 2 Results
-<mostly consistent across three units
-<some variability which persisted
-<ears down hindered coverage
-<but didn't break it
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!IMG|/home/james/james/pix/in/2007-01-13-17-46-31/s08-317x.jpg
---
=Range Test 3 Configuration
-<two units in ad-hoc mode
-<one unit on top of car, 1.5m above ground
-<one unit walked down range
-<streaming audio in WAV format
-<8000 Hz and 44100 Hz over SSH
-<ping ten times per second
-<record iwconfig signal and noise level
---
=Range Test 3 Results
-<600m fine with gentle undulation
-<1.3km fine with good line of sight
-<range not yet tested beyond 1.3km
---
=Next Tests
-longer range
-mesh mode
-hidden node
-more netrek
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=Never Endings
-<how many ways are there to
-<position five units?
-<how many ways are there to
-<obstruct paths between nodes?
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!IMG|/home/james/james/pix/in/2006-09-07-17-22-56/s08-059x.jpg|Outback Mesh Network
---
=Questions?
See laptop.org