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Archive for the ‘wireless’ Category

Wireless workshop, Nepal, Pokhara, 14-24 September

Wednesday, September 9th, 2009

A workshop on (not only) wireless networking in Pokhara, Sept 14-24, organized by

brings together about 30 participants from a.o. the Nepal Wireless villages, the Nepal NREN, ISOC Nepal, supporters and activists.

The first 5 days will be classroom/lab training, followed by deployments in 2-3 villages.

The workshop aims at

  • preparing the next phases of the Nepal Wireless network extension
  • empowering villagers to run and maintian their own networks
  • establishing a series of upcoming training events, by training future trainers and assembling a training hardware kit.

The workshop agenda (changes possible) is at

https://ws.edu.isoc.org/trac/wirelessu/wiki/PokharaWorkshopCurriculum

“war”cycling nostalgy

Tuesday, July 21st, 2009

on the occasion of presenting the rebike in malmö, and talking about gps data collection etc, we came across this almost pre-historic gps wireless mapping, taken circa 2003 or 2004 in Malmö.

at the time, people used the term “wardriving” for this mapping of networks. we always preferred “peace-cycling”.

malmo_wlan_01_quickshot03

re:bike at hacknight malmö

Thursday, July 16th, 2009

Thanks to everybody at Forskningsavdelingen for a really good event.

We presented both the rebike work and and overview of international user driven  network inititatives, with focus on african projects.

We hope to involve those interested in future hacking work.

rebike_talk_malmoe, 11 july 2009

rebike_talk_malmoe, 11 july 2009

reboot11: action in africa

Tuesday, June 30th, 2009

slides from a talk given at reboot11, on 26 june 2009.

topics: action, (user owned) networks, new technology & new business models in africa.

(PDF, 3.2 MB)

reboot11_-_action_in_africa_-_compressed

riding the re:bike

Friday, June 26th, 2009

after day 1 did not go so well – we had troubles with hardware, a dead router – the terrific group work on day 2 made it possible to finish the re:boot:cycle or re:bike.

the re:bike - solar panel, bullet & basket, cams, ..

the re:bike - solar panel, bullet & basket, cams, ..

it now provides

  • an internet uplink via 3G
  • a local wifi cloud via a Ubiquiti Bullet

all run fully autonomous from solar power (55 W panel, 35 Ah battery, for now)

next steps:

  • all kinds of apps over usb – video, gps to openstreetmap, power stats
  • a version with flexible solar panels … wrap it in light

we will make all technical info and a gallery available here, soon – for now we will ride the bike to the reboot afterparty.

thanks to everybody who was part of this (and to those we have forgotten, pls add your comments or write to us at wire_at_less_dk):

  • catherine miller (reinvented – the wonderful basket)
  • luisa carbonelli (the wonderful basket)
  • morgan roderick
  • olle jonsson
  • peter madsen mygdal
  • reboot at large
  • siert wijnia (reprap)
  • thomas madsen mygdal
  • tilmannn singer
  • torben oleander

we are tomas antvorskov krag and sebastian buettrich, wire.less.dk .

next plans and how to get involved:

check out the project wiki and/or send us a mail: wire atandsoforthyouknow  less dot dk

here is Vilhelm’s first ride on the bike:

re:boot:cycle: work day one

Friday, June 26th, 2009

re:boot:cycle: a solar/human powered wifi gps bike

the powering is finished and working nicely.

batteries filled with daylight power.

work on bike

work on bike

a waterproof basket is being made out of scrap metal.

we have issues with the 3G router though – it ceased to function and needs to be replaced.

25062009013

we d be grateful for helping hands and brains.

re:boot:cycle: a solar/human powered wifi gps bike

Wednesday, June 24th, 2009

for the june 25/25 reboot in copenhagen, we are building a solar/human powered wifi network bicycle.

where to find it/us:

  • outside the Kedelhallen reboot venue, all day, 25/26 June.
  • you are very welcome to drop by and help / get involved. we will build solely on location. so there will be work :)

what does it do?

  • provide uplink via a  3G (mobile data) connection
  • redistribute access to a local wifi cloud / mesh network
  • record  GPS and send real time data to the openstreetmap project

applications:

  • ad-hoc networks for (urban) interventions
  • GPS mapping
  • video mapping
nihola transport bike / c nihola.info

nihola transport bike / c nihola.info

solarland slp 50, c solarland

solarland slp 50, c solarland

material / gear:

  • a nihola transport bike
  • power: 55 watts solar panel
  • power: 35-80 Ah battery
  • power: 12 volts bike dynamo, optional
  • networking gear / uplink:
    Huawei 3G router running factory firmwar e/ Linksys NSLU2 running OpenWRT or debian, with a Huawei E220 3G modem hanging off i
  • networking gear / wifi cloud:
    various Ubiqiti (e.g. Bullet), open-mesh, Linksys routers
  • data collection: GPS
  • data colection: video cam, optional

related projects:

the dawn of community owned fiber

Friday, June 19th, 2009

Last week, 12 June 2009, a regional workshop in Dar es Salaam brought together 28 participants from Tanzania, Kenya, Uganda, Burundi and Rwanda.

The theme: Community Fiber.

So far, community networking has mostly been associated with wireless and other low cost technologies. Fiber most definitely was not one of them.

(

As a side comment -

it is pretty unclear what we mean when saying “community networking”. Just try google for a definition. Or look at this long discussion thread on the community informatics researcher list. But for now we will leave that aside and assume a community network to be a network owned and controlled by its users, in some way, directly or indirectly.

)

However, we are beginning to see community networking leaving the wireless domain, and moving to fiber. Why is that so, and why now?

Let s look at two regions very different from one another, Eastern Africa and Scandinavia, and question the notion of fiber being expensive.

True, when a scandinavian company or household seeks to buy fiber to the house or office, this will cost a few thousand USD, even if it s only a few meters of fiber.

Reliable statistics about fiber deployment cost in urban areas in the USA and Europe are hard to come by, but most experts and deployers end up with estimates around (several) 10,000 USD per kilometer.

Regardless, there is a long and successful history of user owned (fiber) networks in Scandinavia – often linked to social entities like housing cooperations (e.g. the danish Andelsforeninger), these networks typically integrate internet, phine and TV and often connect 100s and 1000s of households. Their size makes them accepted negotiation partners of the ISPs ad providers – they have accumulated critical market mass.

Doing research on fiber deployment cost in Eastern Africa, you find costs of only about USD 1000 per kilometer, sometimes significantly lower.

While part of the cost is driven by technology that is artificially kept expensive, most of it obviously is cost of labour – and this opens a window of opportunity for countries where labour is comparatively cheap.

(

A norwegian company recently demonstrated how much money there is to save for deployers by letting the customer dig their own trench: USD 400 off your bill.

)

With deployment cost under USD 1000 / km, fiber begins to compete with wireless links: a reliable, carrier grade kilometer on 802.11 will cost you at least in the same order of magnitude, some 100s of dollars.

While wireless clearly is attractive and often the only option for the first mile (the mile from the user/customer to her ISP or communtiy infrastructure), it runs into bandwidth limits when used as infrastructure.

And with the new network tiger states putting the benchmark at “Gigabytes to the home if you want to be competitive”, future oriented network initiatives need to look at that. In this context, the undeniable success of mobile data in large parts of sub-saharan africa is not only insufficient, but even a dangerous dead end – when it is mistaken for a infrastructure solution rather than a first mile commodity.

And why does fiber become even more exciting right now, especially in southern and eastern africa?

african undersea cables / @ manypossibilities.net
african undersea cables / @ manypossibilities.net

Because of the arrival of the fat undersea cables. Three independent new cables are starting operations these days: SEACOM, EASSy and TEAMS. Read more about it on this excellent update page at manypossibilities.net

The SEACOM cable reportedly has started operations, though discussions on the relevant mailing lists (e.g. http://groups.yahoo.com/group/eThinkTankTz/ )are lively, regarding whether it just has been “officially” or “really” opened. The discussion is interesting, because of an underlying question:

Who is or will be ready to fill the fiber with light? Who is or will be ready to become customer to the agencies offering bandwidth? Will it – once again – only be privileged (global) corporate customers, or will communities, NGOs, small businesses be able to connect?

seacom arriving in kenya / c the conomist

seacom arriving in kenya / c the conomist

In Tanzania for example, there are many existing islands of fiber deployment – once connected upstream, these could open for a new era of connectivity in the country – if, and only if, there are infrastructures ready to interconnect and pass on the light.

Not to forget in this context: the existing and upstarting RENs (Research and Education Networks), university campus networks, and so forth.

It is about the ability of working together in communities across sectors, the importance of accumulating market power and building scaling critical mass, as has been demonstrated by the – admittedly very different – scandinavian Andelsnetworks.

Sengerema Shared Mesh Network – Tanzania’s first of a kind

Friday, March 13th, 2009

This project is already a bit older – it was implemented in October 2008.

But on the occasion of presenting it at the ICTP Wireless School, and because i feel honoured to have been able to be part of it -

here s a presentation of it -

pictures mostly, but with many links for further reading.

And in case you are interested, or would like a higher resolution version of this file, just mail me at sebastian_at_wire.less.dk.

sengerema_mesh_network_ictp_2009_compressed

Here’s a few more links for further reading:

In one of the URLs cited, Miep Lenoir (IICD) writes:

Tanzania Telecentre Network (TTN) builds a wireless internet network in Sengerema. It is the first wireless community network in Tanzania, making internet available and affordable to a large number of people living in rural areas.


In the first phase, the wireless network connects six community organisations to the internet. In phase 2 and 3, it aims to connect all wards in Sengerema District. The community network will be officially launched on the 26 October at Sengerema Telecentre Mwanza Tanzania.

The first phase of the wireless network is built during a workshop from 20th – 25th October, 2008 at Sengerema Telecentre  Mwanza Tanzania. The Workshop is being organized by TTN with support from IICD (International Institute for Communication and Development).  The Tanzania Telecentre Network was established in 2007 by several telecentre managers for the purpose of creating a platform that facilitates knowledge sharing and capacity building on relevant content, technical skills and sustainability of telecentres. An important variable in a sustainable business model for telecentres are the costs for internet connectivity. For this purpose TTN had decided to pilot with a business model in which the costs for internet connectivity are shared with several stakeholders in the community by a wireless network.”

OpenWRT on the Ubiquiti Bullet2

Friday, February 20th, 2009

Reporting from the ICTP Wireless School 2009.

The Ubiquiti Bullet2 in many ways is a dream come true:

small, powerful, outdoor ready,
low power (4W max says datasheet),
running an open GNU/Linux based firmware.

ubiquiti bullet

The Ubiquiti firmware (AirOS) is fine,

and we have built a nice mixed 2.4/5 GHz network,

using NS2/5 and Bullet 2/5.

However we also wanna try meshing with this device,
using OpenWRT with OLSR and maybe B.A.T.M.A.N.

So, can this be done?

The Bullet2 essentially is a NanoStation2 in a different shape,
apart from a slight difference in the processor.

The NanoStation uses an Atheros AR2315, whereas the bullet has

• Processor Specs: Atheros AR2317 SOC, MIPS 4 KC, 180MHz
• Memory Information: 16MB SDRAM, 4MB Flash
• RF Connector: Integrated N-type Male Jack (connects directly to antenna)
• Power Method: Passive Power over Ethernet (pairs 4,5+; 7,8 return)
Recommended DC voltage range is 10V to 24V.
Power consumption < 4 W

We know that OpenWRT on Nanostation works fine.

Openwrt announcement of release 8.09 states support for

* Atheros AR531x/231x based routers

so that should be fine.

As a side note on the atheros AR2317,
The work for the Mesh Potato settled on the Atheros AR2317 chip as a likely candidate for the Mesh Potato.

So, it would make a lot of sense to focus on Atheros AR2317 chips.

Several posts on openwrt and ubnt forums report success, so we would not have to be first and burn our fingers:

http://www.mail-archive.com/openwrt-devel@lists.openwrt.org/msg02637.html

http://zoobab.wikidot.com/ubiquity-bullet

http://forum.openwrt.org/viewtopic.php?id=17425

The right firmware seems to be this:

http://downloads.openwrt.org/kamikaze/8.09_RC2/atheros/openwrt-atheros-ubnt2-squashfs.bin

(URL at that time – might change as kamikaze releases progress! May 2010 URL is http://downloads.openwrt.org/kamikaze/8.09.2/atheros/ )

a quote from forum above states:

“I could flash the Bullet2 directly with the “firmware update” form and file http://downloads.openwrt.org/kamikaze/8 … uashfs.bin”

Concluding, it seems like we can do it, without risk, and even the easy way, through the web GUI update firmware form.
(should that fail, we can still use the tftp way).

First attempt via the web GUI works just fine.

This was almost too easy.

Next step is looking at internals, performance, trying batman, and building a little Bullet mesh at the

ICTP Wireless School 2009.


Power consumption:

We did some quick measurements – Bullet running OpenWRT and under full operations – power uptake was about 2.2 – 2.3 Watts. Very nice.

Need to measure more detailed though.


Before we continue, we check whether the we can flash back the Bullets to their original firmware, AirOS.

Short answer, flashing back is no problem -
the procedure is the same as for the LiteStation, described by Ubiquiti here:
http://www.ubnt.com/downloads/LS-Recovery.txt

  1. Connect the bullet to your computer via ethernet cable.
  2. Set your computer to be 192.168.1.x, but not 192.168.1.20.
  3. Power down the Bullet.
  4. Power it back up, while at the same time holding the reset button, for about 10 seconds. By now, the second LED should be flashing green, and the device be pingable on 192.168.1.20
  5. The device is now waiting for a tftp transfer.
sb@sb-laptop:~$ tftp
tftp> connect 192.168.1.20
tftp> binary
tftp> put NS2.ar2316.v3.3.1.4227.090128.1828.bin
Sent 2989541 bytes in 13.2 seconds

Remember to be patient – give the process at least 7 minutes.
Dont interrupt it.

If everything worked out, you are now back with the original firmware.



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