[Olpc-open] How to? School server implementation

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[Olpc-open] How to? School server implementation

Postby sulochan acharya » Fri Jan 18, 2008 5:07 am

Hello everyone,
I have some general questions regarding school server implementation. I was hoping someone with development experience or someone with pilot experience might have some knowledge on this matter. I am working to implement the OLPC pilot program in Nepal, and would really appreciate some feedback on these questions

1. What is the best way to publish/collaborate/save etc with school server? Meaning what is the best way for kids to save, retrieve, and share files through a school server? I know moodle is an option , but is there anything else? Has anyone tried a different way to do so? something like web folders maybe ?

2. Is the active antenna the same as any wireless router working as an access point? I should be able to use the same networking features if i use a wireless router right?

3. What is the range of the antenna by itself? (discarding the fact that the XO's can relay)

best,
-sulo
sulochan acharya
 

[Olpc-open] How to? School server implementation

Postby Edward Cherlin » Sat Jan 19, 2008 12:33 am

On Jan 18, 2008 2:50 AM, James Cameron <quozl@laptop.org> wrote:
G'day,

I've tested the XO and the active antenna devices in the desert in
Australia.

Good on you.

On Fri, Jan 18, 2008 at 02:51:57PM +0545, sulochan acharya wrote:
2. Is the active antenna the same as any wireless router working as
an access point?

No. A typical access point consists of a radio and a small computer
which runs an embedded operating system from flash memory. Such
wireless routers will lack the mesh interoperability. Without a mesh
gateway, the mesh will not work ... an XO that is outside the access
point range will not be able to get to the internet through other XOs.

3. What is the range of the antenna by itself? (discarding the fact
that the XO's can relay)

The prototype active antenna that I've tested (2007-11-10) easily
achieved 1km between each when held at 3m above ground. Range is
decreased as height is reduced, or when obstructions are in a path, or
when other 2.4GHz radio traffic is nearby.

Many of us have been waiting to hear of a replication of the previous
50-unit test, this time over 50 km rather than 10,000 ft (3 km). In
some suitably flat and barren desert or dry lake bed. Then, of course,
we need tests in cities, rain forest, savannah, hills, high mountains,
and tundra. Are any of these planned?

It is very difficult to predict how a location will operate. I would
expect a range of about 200m in an area with moderate building density,
if the antenna is mounted above the buildings. Plan for ranges between
50m and 500m.

(Those with more knowledge please correct me.)

--
James Cameron mailto:quozl@us.netrek.org http://quozl.netrek.org/
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--
Edward Cherlin
End Poverty at a Profit by teaching children business
http://www.EarthTreasury.org/
"The best way to predict the future is to invent it."--Alan Kay
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[Olpc-open] How to? School server implementation

Postby Ivan Krstić » Sat Jan 19, 2008 6:35 am

On Jan 19, 2008, at 1:09 AM, John Watlington wrote:
The correct way to do this is to work with the Journal to treat the
laptop as a cache of a larger Journal datastore located on the
Schoolserver (and beyond, "in the cloud"). Perhaps Ivan can detail
his vision and we can get other people to help implement it.


The current datastore codebase is hopeless and being scrapped. The new
DS which supports this mode of operation natively was designed during
this week's DS summit (spec to follow for public discussion in the
next 2-3 weeks), and is currently planned to land in joyride as soon
as update.2 is out, targeting full system integration in the update.3
cycle.

--
Ivan Krstić <krstic@solarsail.hcs.harvard.edu> | http://radian.org

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