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Old 07-26-2005, 09:23 PM   #1
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Registered: Feb 2005
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External serial modem suddenly not connecting anymore

Alright, so I have a external serial modem, it has worked fine up until now. Last night, there was a thunderstorm and we had two power outages in pretty quick succession. I restart my computer, did a quick fsck, and everything seems fine.

Except one thing.

My modem won't connect anymore. It's attached to ttyS0, and when I run pon it just sits there. plog shows that it's sitting there waiting for OK and never getting it. Twice. it looks like this (paraphrased):

send ATZ:
expect (OK)
send AT
expect (OK)
script ip-up failed.

I am assuming that alarm means time-out, since it only appears after aboiut a minute of waiting, and that ATZ and AT are different initialization strings for the modem.

I know that the phone cable going to the modem is fine, because I plugged a phone into it and got a dial tone. I assume that the serial port is fine because otherwise it wouldn't be able to even get that far in the ip-up script, right? I don't happen to have anything else I could use to verify that the serial port is fine (unless there's some command line test I could do to knowledge of the huge repository of command line tools is far from complete.)

I am running Ubuntu Warty.

So any ideas?
Old 07-26-2005, 10:53 PM   #2
Registered: Jul 2005
Location: Washington
Distribution: fedora core3 soon ubuntu
Posts: 50

Rep: Reputation: 15
Its possible you fried it. I have seen it happen before.

try the modem on a different machine and see if it connects.
Old 07-26-2005, 11:07 PM   #3
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Registered: Feb 2005
Posts: 19

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Yeah, that's what I feared....


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