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Fon

Die Vorteile von DSL Telefonie

Januar 18, 2008 von Harald Puhl

Immer mehr Haushalte setzen auf einen schnellen DSL Anschluss. Und dies nicht nur, um im in rasanter DSL Geschwindigkeit von einer Internetseite zur anderen zu gelangen, sondern auch, weil über den Datenanschluss telefoniert werden kann. DSL Telefonie heißt das Zaubewort.  

DSL Telefonie ist inzwischen eine probate Alternative zur herkömmlichen Festnetztelefonie geworden. Der Unterschied zwischen den beiden Technologien ist kaum bemerkbar – die Sprachqualität ist auch bei DSL Telefonie hervorragend. Und auch wer sein „altes“ Telefon weiterhin verwenden möchte, kann dies problemlos tun. 
Die Grundlagen der IP-Telefonie finden Sie unter nachfolgenden Link.

Zudem hat DSL Telefonie über einen DSL Anschluss einen entscheidenden Vorteil gegenüber der alten Variante: In punkto Kosten kommen DSL Telefonie Kunden deutlich besser davon. Zum einen deshalb, weil die fixen Anschlusspreise geringer sind. Und zum anderen, weil eine DSL Telefon Flatrate hilft, die monatlichen Kosten für Telefongespräche auf ein Minimum zu reduzieren – zumindest, was die DSL Telefonie ins deutsche Festnetz angeht. Denn ähnlich wie eine DSL Flatrate die monatlichen Ausgaben für das Surfen im Internet pauschal abdeckt, hält man seine Telefonkosten Monat für Monat stabil.

Mittlerweile bekommt man DSL Telefonie bei vielen der zahlreichen DSL Anbieter. Grund: Immer mehr DSL Provider operieren nicht mehr über das Netz des Telekom, sondern haben eine eigene, rein auf DSL basierende Infrastruktur. Über diese laufen die DSL Angebote, zu denen immer auch DSL Telefonie beauftragt werden kann. Die Telefon Flat kann immer gleich mit hinzugebucht werden – sofern sie nicht schon als fixe Paketkomponente automatisch in einem gewünschten DSL Package mit dabei ist – und kostet selten mehr als 10 Euro im Monat. Bedeutet: Schon bei durchschnittlichem Telefonaufkommen lohnt sich die Inanspruchnahme einer DSL Telefon Flatrate.

Wird auf DSL Telefonie gesetzt, ist eine entsprechend ausgerüstete DSL Hardware vonnöten. Bei den meisten der DSL Telefonie Provider bekommt man sie zu einem günstigen Preis oder gar kostenlos in Verbindung mit einem DSL Paket gleich mitgeliefert. In der Regel ist dies ein WLAN Router, in dem ein DSL Modem bereits integriert ist.

Fondoo, a Fon-friendly ISP, censored…by Fon

Mai 2, 2007 von Harald Puhl

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Weirdness happens in the most strange places, and the Fon forums are an endless source of fun. Their moderator, known as moderfon, throws his wrath around like a dragon, censoring posts that are not convenient to Fon’s image. Those who complain or even link to external stories that deal with topics such as replacing the Fonera’s firmware, or problems and bugs such as the overheating routers, are ruthlessly censored, and the posters threatened with being banned.

I have moderated public forums for almost 10 years now, and there is a very delicate balance between keeping things on topic, abusive users, and the community. You simply cannot have a forum about a topic, and then arbitrarily decide when and how its members can or cannot talk about the topic. If the topic of Fon’s forums is Fon, then users should be allowed to say anything related to Fon, be it good, bad or even how to hack the routers. People should be allowed to complain about a company on the company’s own forum, else, it is basically a propaganda tool, or something one must have for public image. “Sure, we like our community, we have a blog and a forum!”. Keeping a company forum on topic does not mean keeping it on the topic the company would like to see, but making sure there is no spam, users don’t become abusive, flame wars are tamed, and people get a feeling that they are contributing to something. Censoring uncomfortable topics is not the way to go.

In this particular case, a UK ISP known as Fondoo.net, who define themselves as “the UK’s first FON Friendly ISP.”, has had its name censored from Fon’s forums. Any mention of the word ‘fondoo’ will be shown on posts as *xxxx*, as can be seen on this thread (scroll down a bit to the first post by euronerd). Seems like a very fast way to lose friends, and shows how to not build a community. As this thread will probably be censored (there was a thread about censorship that itself got censored!), I took a screenshot of the relevant bit:

fondoo

Update: I found a link to this Wikipedia entry (I tend not to link to Wikipedia as a general rule, but I’ve reviewed this article and it seems just fine), which is a great introduction and explanation of what it means to moderate a forum (wink wink, moderfon). Thanks to Kyros for posting the link on AustinTX’s blog, it will come in handy more than once methinks!

Fonera overheating – are we cooking yet?

März 17, 2007 von Franz Hieber

You probably have seen the video on YouTube about a molten Fonera, apparently due to overheating, which shows the plastic case completely deformed. Gizmodo (also in spanish) and other sites are also reporting on this. As usual, Fon has censored the post on their forums that broke the story, but alas, thanks to their partners at Google, here is a cached version. Even Martin Varsavsky seems worried about this. It seems the damage is obviously from heat, but could it have come from the Fonera itself?

I, and others, have our doubts about wether this video is a fake stunt, or a true story. It is true that the Fonera overheats, much more than would be expected from a consumer-electronics product, but to the point of causing physical damage to the plastic case?

The heat problem

Heat in electronics mostly comes from dropping voltage by converting current into it, in our case, the voltage regulator in the Fonera drops 5V to 3.3V at 500mA, resulting in the dissipation of 850mW. That’s right, we are dumping 850mW right into the atmosphere in the form of heat. This brings the operating conditions very close to the maximum ratings for this regulator, which has a maximum rated thermal resistance of 90ºC/W, my calculations put the operating conditions at 88ºC/W. Additionally, the wireless section of the Fonera is also converting a lot of energy into heat.

The measurements

After I finished my tests, I got a comment from Pobletewireless, regarding his own measurements of the heat problem, which are shown in very cool thermographs (no pun intended!) – much nicer than my rather rudimentary method.

I measured the temperature of the Fonera using a thermocouple connected to a Fluke 123 Scopemeter via an 80TK thermocouple module. The thermocouple was placed in between the heatsink and RF shield, the case closed, and the Fonera powered, as can be seen in this picture:

Thermal probe in the Fonera

After 10 minutes operating normally, the temperature had risen to an average of 72ºC, with a peak of 80ºC.

The average temperature of the Fonera

The second batch of measurements were performed drilling four small holes to allow the thermocouple into the casing, the locations are shown in the following picture:

Probe holes

Maximum temperature at one corner was 43ºC. Next, an attempt was made to melt the white lid of the Fonera, by exposing it to a high temperature airflow from a paint-stripping gun, and at the same time, applying slight pressure from below. The thermocouple was used to measure at which point the plastic became maleable, and deformation started. At around 100ºC, the plastic was soft enough that a solid object could change its shape – this is in line with ABS plastic thermal properties, which state a deflection temperature around 100ºC, depending on specific material composition.

As the deflection point test resulted as expected, the lid was then exposed to an airflow at 280ºC for two minutes. The result of this exposure is shown in the pictures below:

Fonera lidFonera lid 2

It’s obvious that some deformation has taken place, with discoloration and charring on the point where heat was directly applied. However, the front side of the lid had mostly retained its shape.

Conclusions

The Fonera does indeed run very hot, much hotter than it should, if anything, for the good of the internal parts. Electronic components are sensitive to heat, with maximum ratings given by each manufacturer in terms of storage and operating conditions. The higher the temperature, the lower the service life of any given component. Some are affected more than others, most notably, electrolytic capacitors have a high sensitivity to heat, as it can evaporate the electrolyte quicker, causing it to fail. The capacitors in the Fonera are made by Taicon, a taiwanese manufacturer, and are max-rated for 105ºC. From the datasheet [PDF], at this temperature, the capacitor will fail after some 2000 hours, around 83 days. Following Arrhenius’ Law, and since the area around the capacitors was found to be at around 52ºC, their expected life would be 7800 hours, or about 325 days – what a coincidence, almost a full year, after which your warranty has expired. Comparing the Fonera to a Meraki Mini, one realises that there is a serious design flaw, as apart from the Mini having a switched-mode regulator, the wireless section shares exactly the same design as the Fonera. The temperature measured outside the casing of the wireless section indicates that the junction temperature of the components inside has to be ridiculously high. So, one conclusion is that the Foneras will eventually fail due to overheating, and it will probably happen sooner than later.

On the deformation / melting video – in my opinion, it’s not real. At least, it couldn’t have happened without the Fonera reaching temperatures around the whole casing that would have caused some components to blow up (for example, the capacitors). The Fonera could not have undergone such an extreme temperature, and still function as shown on the video. The temperature gradient between the heatsink and one corner of the case is almost 2:1, thus, to reach a deformation temperature of say 200ºC at the corner, the heatsink must have been running at 400ºC! A final bit of evidence – the sticker. If you look closely at the video, the sticker on the bottom of the Fonera looks almost unscathed. Here is a picture of what it looks like after applying a 250ºC airflow for 30 seconds, which causes the plastic to deform:

Fonera bottom

Obviously, a more prolongued exposure would have damaged it even more. In all honesty, I would love to get more details from the guy who made the video, as it stands right now, I’d call it a hoax.

New Fon routers with LAN and USB ports, but not by Fon

Februar 26, 2007 von Harald Puhl

I got a tip today that Fon is looking at launching a new router with a LAN port, apart from the WAN port found in the current Fonera (they seem to privately admit not having a LAN passthrough was a rather big mistake).

With the current Fonera, you cannot access devices on the wired side of the network (such as a SAN drive or printer) from the wireless side, be it using the public or private SSID, you are effectively NATted from your own network. A LAN port would solve this the same way as it is done in higher quality devices such as the Linksys WRT54 series.

Fon Liberator?

What really surprised me was to see that these routers have already been shown by Accton, the OEM that manufactures the Fonera on their website for a few weeks. Check out these links, datasheets in PDF available, for a white-label Fonera, a Fonera with LAN passthrough, and what looks to be the Fon Liberator, having a USB port and BitTorrent client built-in! Martin Varsavsky recently put the release date of the Liberator back a few months, originally scheduled for Christmas 2006, citing technical difficulties.

Now, either Accton wants to score a goal taking advantage of the publicity offered by Fon, or Fon didn’t pay an exclusivity fee for the design of these routers, or both. One million routers by 2010 is nothing by asian manufacturer standards, but they do allow buyers to secure exclusive designs. Copies could still be found, but not as prominently and by the same manufacturer making their own.

I wasn’t sure that Accton was the designer behind the Fonera, and gave Fon the benefit of the doubt of actually having developed something themselves in the electronics field, but now it seems clear that Accton is the designer of the hardware platfom, so there wasn’t that much development by Fon after all (the firmware was created by the hackers behind DD-WRT and OpenWRT).

FON, ranked the worst company by readers of El Mundo, Spain’s top online newspaper

Dezember 29, 2006 von Harald Puhl

It will not surprise some people, but after the online newspaper El Mundo, the most read online news source in Spain, ran a poll to rank the best and worst  companies of 2006, FON came as the winner in the ‘worst’ category (scroll down a bit, about half way down). With comments such as ‘a project with no future’ and ‘hot air’, readers gave enough bad marks to put FON in the spot. The poll was open, so people could vote for any company they wanted, there was no shortlist or closed options.
I have been very critic with FON in the past, and I have also been accused of all sorts of things in relation to the criticism, but I know there are a lot of people out there upset with the way things have been running. They have had many chances to fix their problems, it’s not that hard to implement a decent customer service, or to fulfill orders in reasonable time, it just takes good management and a competent team. I am sure there are many very competent people at FON, who work really hard every day to make things happen, but their efforts have sadly not transpired.
As for the picture, I hope it doesn’t offend anyone, but since there was no response by Martin to my comments on his blog after his acid post, or after reporting the vulnerability in their maps service, I don’t have any moral issue about making fun of FON (no pun intended…well…sort of).

The Fonera, hacked to run OpenWRT

Dezember 27, 2006 von Harald Puhl

It was only a matter of time until the developers of open-source firmware OpenWRT and DD-WRT managed to port the OS to the Fonera, which is based on an Atheros chipset. As described in this thread of the DD-WRT forums, there is a firmware package available for download, which can be flashed onto the Fonera, thus replacing FON’s original firmware and functionality. I think it will be a matter of time until we see reflashed Foneras on eBay, just like we saw Linksys once upon a time.

The hack is not for the faint-hearted, and so you risk bricking your router if the flashing fails – there is still a way to de-brick using the serial port, but in any case, don’t try this at home unless you know what you are doing. We are on the cutting edge of the development, which eventually trickles down into easier-to-follow HOWTOs and step-by-step guides.

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