wvdial works but disconnects with carrier left active

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Greetings,
I am a Linux and Ubuntu newbie attempting to donate
40+ surplus computers to disadvantaged students and
their families at our school here in West Texas. I am
setting them up with Edubuntu 7.04 because of the Open
Office and educational software. These families cannot
afford cable or DSL connections (these computers all
have working eth0 connections) so I am attempting to
install modems for (possibly affordable) Internet
access.
 
wvdial has been installed and dials out, however when
it connects and I am supposed to get a TTY display (or
something) to type into, I never get one. I'm guessing
here, I am not familiar with how modem protocols work.


Gnome-ppp shows the disconnect message, but fails to
hang up, leaving the line and carrier active until the
provider times out. This continues until reboot.

After the disconnect message below, the modem
/dev/ttySL0 disappears and cannot be found. The
computer must be rebooted, after which everything
works again up to the point shown.

ALSO: I cannot figure out how to get a full set of
debug messages turned on or saved from wvdial and
other utilities like pppd and gnome-ppp.
 
Below are the texts from Gnome-ppp dialout, wvdialconf
output, wvdial.txt, and /etc/wvdial.conf.
Thanks for all you do! 
Bob Terrell, Lubbock, Texas
 
-----------------
Gnome-ppp dialout text

--> Ignoring malformed input line: ";Do NOT edit this
file by hand!"
--> WvDial: Internet dialer version 1.56
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATM1L3DT6875000
--> Waiting for carrier.
ATM1L3DT6875000
--> Disconnecting at Fri Nov  2 11:37:30 2007

-------------------------
wvdialconf debug scripts

user1@user1-desktop:~$ sudo wvdialconf
/etc/wvdial.conf > wvdial.txt
Password:
ttyS0<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next
try: 9600 baud
ttyS0<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next
try: 115200 baud
ttyS0<*1>: ATQ0 V1 E1 -- and failed too at
user1@user1-desktop:~$ cat /etc/wvdial.conf
 
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Phone = 6875000
Modem = /dev/ttySL0
Username = acooper
Carrier check = yes
Password = acooper
Baud = 460800
115200, giving up.
ttyS1<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next
try: 9600 baud
ttyS1<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next
try: 115200 baud
ttyS1<*1>: ATQ0 V1 E1 -- and failed too at 115200,
giving up.
Modem Port Scan<*1>: S2   S3  
WvModem<*1>: Cannot get information for serial port.
ttySL0<*1>: ATQ0 V1 E1 -- OK
ttySL0<*1>: ATQ0 V1 E1 Z -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttySL0<*1>: Modem Identifier: ATI -- SmartLink Soft
Modem
ttySL0<*1>: Speed 4800: AT -- OK
ttySL0<*1>: Speed 9600: AT -- OK
ttySL0<*1>: Speed 19200: AT -- OK
ttySL0<*1>: Speed 38400: AT -- OK
ttySL0<*1>: Speed 57600: AT -- OK
ttySL0<*1>: Speed 115200: AT -- OK
ttySL0<*1>: Speed 230400: AT -- OK
ttySL0<*1>: Speed 460800: AT -- OK
ttySL0<*1>: Max speed is 460800; that should be safe.
ttySL0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttySL0<Info>: Speed 460800; init "ATQ0 V1 E1 S0=0 &C1
&D2 +FCLASS=0"
 
----------------------------------------------------
user1@user1-desktop:~$ cat wvdial.txt

Editing `/etc/wvdial.conf'.
 
Scanning your serial ports for a modem.
 

Found a modem on /dev/ttySL0.
Modem configuration written to /etc/wvdial.conf.
 
--------------------------------------------------------
user1@user1-desktop:~$ cat /etc/wvdial.conf
 
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Phone = 6875000
Modem = /dev/ttySL0
Username = acooper
Carrier check = yes
Password = ERASED
Baud = 460800
 
 
 
Bob Terrell, Lubbock Cooper ISD, Lubbock, Tx



Bob Terrell
  Lubbock, Texas
bob_terrell_texas@xxxxxxxxx



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