[maemo-developers] [maemo-developers] Can a USB modem be attached to N800?

From: Kate Alhola kate.alhola at nokia.com
Date: Mon Feb 12 12:04:38 EET 2007
ext Andrew J. Barr wrote:
> On Sun, 2007-02-11 at 14:18 +0530, mayank jain wrote:
>> On 2/11/07, Andrew J. Barr <andrew.james.barr at gmail.com> wrote:
>>> On Sun, 2007-02-11 at 00:27 +0530, mayank jain wrote:
>>>> Hi guys,
>>>> I recently found that an ISP - Reliance Telecom here provides a USB
>>>> modem, which uses CDMA technology for establishing a dial-up
>>>> connection. This modem works perfectly with a Linux based machine.
>>>> Device details at
>>>> http://www.reliancecommunications.co.in/Communications/Netconnect/netconnect_hotnew.html
>>>> Look for "Reliance Netconnect USB Modem".
>>>> Is it possible that this modem can be attached to N800 & used for
>>>> internet? Because if this is so, internet would be available to my
>>>> device from almost anywhere - Wifi or no Wifi.
>>> You would want to find some kind of Bluetooth device for this. This
>>> works fine with the Nokia tablets.
>>> The 770 had limited support for USB host mode but AFAIK the N800 doesn't
>>> seem to have this feature. No one has tried it yet, at least ;)
>> Oh,
>> I just saw the thread mentioning 'injecting power into USB" - & this
>> modem needs 5V/500ma, from USB - So i dont think this would be
>> possible...
> It would be horribly unwieldy, you'd need a power injector device as
> well as a USB hub (or at least some kind of adapter). It would defeat
> the "portable" aspect of the Nokia tablets.
It just needs a some kind of hack that injects little bit +5v to
770/N800 USB
connector so that it detects USB device present there. It does not need
power suplied by this way.

I have personally used two kind of hacks for this. Simpler is just to use
USB HUB that has +5V input from power supply. These units has one
schotky diode preventing them in normal operation feeding power back
to host. With 770/N800 usage, just replace this diode with wire that
feeds +5V back because it is behavior that we need.

I have done same hack for some self-powered USB devices, so then no hub
needed al all. Anyhow, all of these hacks needs to have external +5V
power supply
becausse 770/N800 is not suplying power to them.

The other problem is that 770/N800 is having only minimun USB driver set
in kernel and if your device is not matching small number of
manufacturer/device ID, you need to have also kernel driver.

> This is why Bluetooth is ideal for this kind of situation; you'd have
> your cell phone in your pocket, your tablet in hand...pervasive Internet
> access almost anywhere. This is what I do, at least.
I also recommend bluetooth until you have very good reason to use
other methods. I personally used USB to connect embedded realtime
data accusation/real time control device.

> What you describe I believe was at least possible on the 770, however.
>> Right Andrew?
>> :)
>> Makuchaku
>> http://www.makuchaku.info/blog
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