On 2007-12-02, Grant <[EMAIL PROTECTED]> wrote:
>> Yes. My Verizon LG VX4400 works fine as a modem. When plugged
>> into a USB port, it shows up as /dev/ttyUSBn. You can dial up
>> any landline modem you like using "AT" commands, or you can
>> dial up Verizon's internal ISP number. The connection looks
>> exactly like any other PPP connection via a serial modem.
>> Verizon provides low-speed (14.4Kbps) internet access for
>> "free" (doesn't cost you anything but normall calling
>> minutes). The free low-speed access isn't officially
>> supported: you won't find it listed in your contract. But,
>> it's always worked for me when I've needed it (I haven't tried
>> it for a few months, so YMMV). Higher speed access requires a
>> data plan.
>
> Nice, I'm very glad to hear it works so well. I guess
> something like that would work even over an analog connection.
On a true analog (800MHz AMPS service) cell phone, I've had
pretty decent success using MNP5 modems up to about 2400 baud.
The standard CCITT error dectection/correction schemes used on
landline modems isn't resilient enough for RF links. Good luck
finding MNP5 analog modems. ;) Multitech in St. Paul was the
last vendor I knew about that sold them, and that was 10+ years
ago.
If you're talking about an analog connection to a digital
phone, it just won't work. The Codecs that digital phones use
are optimized for human speech and won't pass QPSK (or even
FSK) modem signals in a usable manner.
>> AFAIK, most of the Verizon phones can work as modems. At least
>> that was true back when I was reading up on the subject (about
>> 4-5 years ago). AFAICT, all the other US carriers required you
>> to pay for a data plan if you want to use your phone for
>> tethered internet access.
>
> Unless you just dial another ISP right?
I don't think so. According to what information I could
gather, I don't think the other carriers provide data
connections to dial-up landline numbers without a data plan.
I'm not sure they even provide that _with_ a data plan. If you
find out otherwise, post a followup. I'd be particularly
interested in Sprint and QWest (which uses Sprint's network).
The problem is that you can't send modem carrier over a digital
cell phone. The phone implements "AT" commands in order to
pretend it's a modem for the convenience of user software.
It's not, however, a modem at all.
It's just passing on digital data that's carried by the
wireless protocol in use (GSM/TDMA or 1xRTT/CDMA). When you
"dial up a landline" with a digital cell phone, the wireless
carrier actually has to connect a modem to a landline at the
carriers switch and dial the number. The digital data from the
cellphone is then routed to that modem.
If you're using the wireless carrier as the ISP, then there are
no modems involved at all: the digital data from the modem is
simply routed onto the Internet.
--
Grant Edwards grante Yow! My Aunt MAUREEN was
at a military advisor to IKE &
visi.com TINA TURNER!!
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