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