Thread: N9 not charging via provided USB data Cable
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hw9xx is offline hw9xx
2013-01-26 , 10:01
Posts: 101 | Thanked: 62 times | Joined on Apr 2012
#21
Thank you for the good summary of the technical side. I fully understand that, however:

Originally Posted by rainisto View Post
Sorry to disappoint you, all Nokia branded cables conforms to USB standard,
...
In summary, all the usb cables are standard, and each manufacturer has its own proprietary trickery to determinate charging mode.
Could you please explain the contradiction between these two statements or at the very least point me to the section in USB-docs where those "trickeries" are regulated as being part of that standard?

Originally Posted by rainisto View Post
there is _no_ difference between CA-101 vs CA-101D cables, other than that D is much sorter, so you get more mA's through it.
...
So basicly if you charge with a long standard usb cable from laptop then N9 can in some cases only see 50mA-200mA and refuse to charge at all. With shorter cable it sees 300-500mA and can trigger charge mode on.
So firstly you're saying that even Nokia cabling that is explicitly labeled as "data-cable" is not even compliant with USB standards?!

Seconly: I'm no engineer but I do have a multimeter and know how to use it. If such an (relatively small) extra length of cable would cause such a rise in electrical resistance that it would result in a drop in current in the 100's of mA I'd have to consider Nokia cabling to me made of unsuitable materials. I cannot even think of any conductor material normally used in cables that would even remotely allow for such a loss of power over an extra meter or so!!! What is Nokia using? Straw?

Thirdly: DID YOU EVER READ WHAT I WROTE IN THE BUG REPORT: "Could it be the N9 is extremely picky when it comes to input voltage?" OK so I wrote about voltage but basically now you're agreeing with my wild guess that power-level is the issue of the problem!!!


Now, since IMHO you're still missing the POINT:

The problem is not the "trickery", the length of the cabling OR the USB standard each by itself. The problem is THAT THE N9 IS THE ONLY PHONE THAT IN THE SUM OF THESE FACTORS IS NOT WORKING AS EXPECTED. It does not charge where any other phones with USB-charging start to charge right away. In other words NOKIA FAILED TO MAKE THE N9 WORK WITH IT'S OWN MIX OF "TRICKERY". And that, with all respect to your arguments, must be considered a BUG.

I mean there is enough problems with interoperability in general. Now if Nokia fails interoperability even with it's own products (see bug report) then I don't see why I should continue buying any of their products ...