Verizon V620 wireless card

[Volker]

John,

On 02/06/07 04:35, John Nielsen wrote:
> On Monday 05 February 2007 17:57, Volker wrote:
>>> ucom0: Novatel Wireless Inc. Novatel Wireless Merlin CDMA, rev
>>> 1.10/0.00, addr 2
>>> ucom0: ubsa_request: STALLED
>>> ucom0: ubsa_request: STALLED
>>> ...
>>> (lots more STALLED messages)
>> John,
>>
>> just added myself to mobile@ (thanks for cross-posting this to usb@
>> so I got notice of this discussion).
>>
>> If you're using the V620 (or any other (W-)CDMA) card with ppp, you
>> should make sure you're using:
>>
>> set cd 30! (note the exclamation mark at the end)
>>
>> I've seen _a lot_ of problem reports (not just with FreeBSD) where
>> ppp does not recognize a connection loss when using W-CDMA cards.
>> The exclamation mark forces ppp into waiting for a carrier and
>> following that CD signal.
> 
> I'll play around with that, thanks.
> 
>> I suspect your problems might come from a bad signal. I don't know
>> much about the V620 (just that it's only used in nothern america)
>> but if it's a high-speed card (transfer rate > 56k, 3G mode?) you
>> should force your card into GPRS or 3G mode.
> 
> I'll experiment with that too. One thing I'm not sure I mentioned in my 
> first post is that the STALLED messages only show up when the device is 
> opened and closed. If I use ppp in manual mode I get about six of them when 
> I first start ppp but none while I issue any AT commands or while the link 
> is active. Then I get about six more when I close the link.

You may even try to open the device with a speed setting of 1200
baud. I've played with userland ppp and found that when using speeds
above 115kbit ppp might behave oddly. For any tty device which is
not associated with a real UART chip the speed should not matter.
Even in the driver the speed setting function is a dummy function
which does nothing but ppp takes care of the speed.

I suggest to use a lower speed setting with ppp and try again. You
should have no throughput impact when using 38400 baud with ppp. At
least this is what I was experiencing using 3G hardware.

Please try that (plus the 'set cd xx!' setting) and see if the
stalled messages are gone.

> Thanks for the link. More documentation is almost always better. :)

If you have any good docs for the V620 with the differences to the
U630 I'll put them up also if you can give me pointers. I'm trying
to assemble as much 3G infos as possible as this is a really
interesting infrastructure (I like the idea to have the internet to go).

> I was a little surprised when I first plugged it in under Windows and a USB 
> hub popped up. But hey, I didn't design the card or even choose to buy it 
> (it's part of the lucky ball-and-chain package I get from work when I'm on 
> call).

Most current 3G cards do have an interface like that. I think
Qualcomm designed that and most manufacturers took that. Just the
newer Option Globetrotter cards (3G Max, 3G +) do have a different
interface.

Greetings,

Volker