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no carrier error with Linux dialup

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Original Message
Name: James_hao
Date: May 6, 2005 at 08:06:45 Pacific
Subject: no carrier error with Linux dialup
OS: Redhat Linux 9.0
CPU/Ram: 128
Comment:

Hi,

I recently installed a US Robotics/3Com 56K FaxModem Model 5610 on my Linux box (Redhat 9.0) and am trying to make connection to the ISP provided through my workplace. I tried different ways but all failed though the Modem works perfectly with Windows system.

The following is the related info from to my most recent try. I appreciate any insight provided about the problem.

Thanks so much,
James


[root@jameslocal root]# lspci -v

...

01:08.0 Serial controller: US Robotics/3Com 56K FaxModem Model 5610 (rev 01) (prog-if 02 [16550])
Subsystem: US Robotics/3Com USR 56k Internal FAX Modem (Model 5610)
Flags: medium devsel, IRQ 3
I/O ports at 1840 [size=8]
Capabilities: [dc] Power Management version 2

...

[root@jameslocal root]# cat /etc/ppp/options
lock
crtscts
defaultroute
asyncmap 0
noauth
noipdefault

[root@jameslocal root]# cat /etc/resolv.conf
nameserver 128.231.128.251
nameserver 128.231.64.1

[root@jameslocal root]# /usr/sbin/pppd /dev/ttyS4 57600 debug connect "/usr/sbin/chat -v '' AT OK ATDxxxxxxxxx CONNECT '' ogin:xxxxxx assword:xxxxxx "
Connect script failed

[root@jameslocal root]# cat /var/log/ppp

May 4 12:38:24 jameslocal pppd[1226]: pppd 2.4.1 started by root, uid 0
May 4 12:38:25 jameslocal chat[1227]: send (AT^M)
May 4 12:38:25 jameslocal chat[1227]: expect (OK)
May 4 12:38:25 jameslocal chat[1227]: AT^M^M
May 4 12:38:25 jameslocal chat[1227]: OK
May 4 12:38:25 jameslocal chat[1227]: -- got it
May 4 12:38:25 jameslocal chat[1227]: send (ATDxxxxxxxxx^M)
May 4 12:38:25 jameslocal chat[1227]: expect (CONNECT)
May 4 12:38:25 jameslocal chat[1227]: ^M
May 4 12:38:50 jameslocal chat[1227]: ATDxxxxxxxxx^M^M
May 4 12:38:50 jameslocal chat[1227]: CONNECT
May 4 12:38:50 jameslocal chat[1227]: -- got it
May 4 12:38:50 jameslocal chat[1227]: send (^M)
May 4 12:38:50 jameslocal chat[1227]: expect (ogin:xxxxxx)
May 4 12:38:50 jameslocal chat[1227]: 48000/ARQ/V90/LAPM/V42BIS^M
May 4 12:38:56 jameslocal chat[1227]: ~^?}#@!}!X} }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4w?}'}"}(}"}3^L~~^?}#@!}!Y} }<}!}$}%]}"
May 4 12:38:58 jameslocal chat[1227]: }&} }*} } }#}$@#}%}&&4w?}'}"}(}"[^~~^?}#@!}!Z} }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4w
May 4 12:39:02 jameslocal chat[1227]: ?}'}"}(}"^C(~~^?}#@!}![} }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4w?}'}"}(}"Kz~~^?}#@!}!\}
May 4 12:39:04 jameslocal chat[1227]: }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4w?}'}"}(}""M~~^?}#@!}!]} }<}!}$}%]}"}&} }*} } }#
May 4 12:39:06 jameslocal chat[1227]: }$@#}%}&&4w?}'}"}(}"j^_~~^?}#@!}!^} }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4w?}'}"}(}"2i~
May 4 12:39:10 jameslocal chat[1227]: ~^?}#@!}!_} }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4w?}'}"}(}"z;~~^?}#@!}!`} }<}!}$}%]}"}
May 4 12:39:12 jameslocal chat[1227]: &} }*} } }#}$@#}%}&&4w?}'}"}(}"}.};~~^?}#@!}!a} }<}!}$}%]}"}&} }*} } }#}$@#}%}&&4
May 4 12:39:14 jameslocal chat[1227]: w?}'}"}(}"FI~^M
May 4 12:39:14 jameslocal chat[1227]: NO CARRIER^M
May 4 12:39:35 jameslocal chat[1227]: alarm
May 4 12:39:35 jameslocal chat[1227]: Failed
May 4 12:39:35 jameslocal pppd[1226]: Connect script failed
May 4 12:39:36 jameslocal pppd[1226]: Exit.


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Response Number 1
Name: 3Dave
Date: May 6, 2005 at 12:49:36 Pacific
Subject: no carrier error with Linux dialup
Reply: (edit)

It looks as though everything is working due to the fact that you are trying to login. I had a similar problem with an ISP in the UK called Demon. I had to dial a different phone number in order to perform a scripted login. Give your ISP a bell, don't say that you are running linux as they will probably just hang up on you. Get through to a proper techie and explain that you are trying to connect either manually with something like hyperterminal (like minicom but for windoze) or via a script.

You should be able to connect manually with either minicom (linux) or hyperterminal (windoze) along the following lines.

Connect directly to the com port and type the following commands:
ATZ
(this resets the modem)
ATDT 5551234
(this dials your ISPs number, in this case 555-1234....you will obviously have to change this to match your ISPs number)
After dialling it should present you with a login prompt....enter your username and you should then be presented with a password prompt. Enter your password....press return at the next prompt and you should now be connected.


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Response Number 2
Name: James_hao
Date: May 6, 2005 at 13:13:35 Pacific
Subject: no carrier error with Linux dialup
Reply: (edit)

Thanks very much for the reply. Your suggestion is good one. With this number however I tried to make the connection with minicom exactly the same way that you described. ATDT xxxxx returned a garbage line and back to prompt without any thing displayed.

I will definitely try a different phone number if it is available.

Thanks,
James



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Response Number 3
Name: Dlonra
Date: May 6, 2005 at 18:30:21 Pacific
Subject: no carrier error with Linux dialup
Reply: (edit)

could be a parity and/or 7/8 bits per character issue


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Response Number 4
Name: 3Dave
Date: May 9, 2005 at 04:38:14 Pacific
Subject: no carrier error with Linux dialup
Reply: (edit)

What country are you dialling from? If it is from the UK you can try dialling demon's purple romp which does support scripting just to see if you can get a username prompt. The number is 0845 2121 666.

FYI http://www.demon.net/helpdesk/technicallibrary/turnpike/scripting/


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