I don't have a working phone to play with, so I'm trying to piece together how this all works
from reading what I can find on the web...especially what does/does not work with Linux
(it seems most stuff should work with linux).
I'd like somebody to confirm my understanding -- when a phone as a GPRS modem for a laptop,
the phone basically runs a PPP server over some kind of serial emulation (IrCOMM/IrDA, or
serial emulation over bluetooth, or USBserial, or some older phones actually do have a serial
port). But I *assume* that GPRS/EDGE actually ship IP datagrams to the APN under some
specific network encapsulation -- and not PPP frames?
So it looks like this
[PC/Laptop] IP packet
^
| IP/PPP/IrComm
|
v
[Phone ]
^
| IP pkt sent as GPRS data to APN
.
.
.
|
v
[APN] IP pkt forwarded to I/net
^
|
(Internet)
I'm also curious to gain a better understanding of how GPRS/EDGE do timeslot
reservation? Does a GPRS mobile station ask for timeslots and get granted them
*but* can have them taken away at any time when network load dictates?
I live in a smallish place -- but would like to try GPRS before I buy...somebody loaned
me an LG C1100, which does GPRS & I have WAP working on Vodacom prepaid. But,
I can't find a serial cable for that phone, and I don't even know if the serial port on
the phone would support GPRS data? (Do all phones that support GPRS data also
act as GPRS modems?).
I also have a concern that even when using WAP or the microbrowser on that thing
that it can take ages to establish a GPRS connection...and about half the time says
that it can't. I am hoping to use GPRS to replace dialup at home...I'd be happy with
30K speeds, but it needs to be reasonably reliable.
If it works -- I'd probably get a Nokia 6320 on contract as it would save me money over
my current exhorbitant dialup charges (about 60 hours/month, mostly callmore time).
The 6320 looks like the best EDGE handset(???). I wonder how long it will be before
EDGE upgrades will make it to a small place like mine (Mtunzini -- about 1400 people,
40km from Empangeni)?
Too many questions, I know...