<div dir="ltr"><br><div class="gmail_extra"><div class="gmail_quote">On Sat, Aug 17, 2013 at 6:27 AM, Tony Anderson <span dir="ltr"><<a href="mailto:tony_anderson@usa.net" target="_blank">tony_anderson@usa.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi,<br>
<br>
I assume this situation is also solar-powered. What is the range over which the school server has to be accessible? Do you wire the APs back to the central location or provide solar power directly to each?<br>
<br></blockquote><div><br></div><div>Well, in Bhagmalpur, we plan to install solar backup someday; currently it's backed up via a UPS. In our case, there are 2 ubiqity picostation access points, one connected directly to the server and getting it's power from the same system. The other AP is in repeater mode and has it's own backup/supply. I'm not saying this will be the case everywhere, just giving my example :-)</div>
<div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
I fully agree that the school server needs its own power in a solar environment. At the first school in Lesotho, the solar installation provides more than enough power so that the server did not require additional panels. However, additional panels were installed to enable the server to be located nearer to the 'computer room' when it was expected all computer classes would be conducted in that room.<br>
<br></blockquote><div><br></div><div>+1</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
At the second school, the laptops are charged from individual panels so that the school server needs a dedicated solar panel and set of batteries. <br></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Even in the community server situation, I would expect it would be on say from 0700-1100 and shut down overnight.<br>
<br></blockquote><div><br></div><div>Do you mean 7am-11pm or 11am? I definitely see the server being powered for more than 4 hrs in many cases.</div><div><br></div><div>Also, looking a little beyond the examples you and me cited, this is an interesting problem to think about. </div>
<div><br></div><div>* In some situations, say small villages, it might be conceivable to provide the School Server's wifi network in the entire (or a major chunk of the village). I'm typically looking at 4-6 picostations per village, serving about a 100-150 users. This is more like a "Village-wide School Server" :-)</div>
<div><br></div><div>* In other scenarios, this is not going to work well AT ALL. When kids often have to travel (walk!) a few kilometers to get to school, you can't really give them wifi access when they're at home. Thus, here the XS plays exactly the part it's called, "a School Server" :-)</div>
<div><br></div><div>In any case, the constraints of power, and solar backup will be present, and we can assume the Server is powered on atleast 6-14 hours a day.</div><div> </div><div>Best,</div><div>Anish</div><div><br>
</div>
<div>P.S. This is what Bhagmalpur looks like from a satellite: <a href="http://tinyurl.com/bhagmalpur">tinyurl.com/bhagmalpur</a></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Tony<br>
<br>
<br>
On 08/17/2013 02:35 PM, Anish Mangal wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
I think this may be the case in a few other places as well. For example<br>
in Bhagmalpur, the school server isnt deployed at a school but a<br>
somewhat central location in the village and the children can access the<br>
server anytime, not just during school hours.<br>
<br>
Also one might think that the XS consumes negligible power when compared<br>
with 50 xo laptops but keep in mind that the server needs to come across<br>
as an 'always on' appliance, including all the wireless APs. Thus while<br>
the laptops might be used for, say 2-3 hours a day. An XS must be kept<br>
on always, along with the hard disks, and along with all the wireless<br>
APs. In such a scenario I would say the the XS preferably have its own<br>
power supply and backup system.<br>
<br>
</blockquote>
<br>
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</blockquote></div><br></div></div>