Re: Out of Band Connectivity Via Modems

If it helps anyone, the ati11 command on most modems will return some
signal information - though sometimes it's only for the last connected call
(which is a bit of a catch-22 when nothing connects in the first place).
 What the different AT commands mean is loosely the same, but there is a
lot of variance depending on the modem you're talking about.

On Mon, Sep 1, 2014 at 11:33 AM, Alexei Monastyrnyi <alexeim73_at_gmail.com>
wrote:

> Nice to hear we still have modems around :-)
> It was so cool back then to distinguish by ear handshakes for different
> speeds :-)
> A.
>
>
> On 9/1/2014 4:07 AM, mdb1986 wrote:
>
> Thank-you. As always seems to happen, the solution presents itself shortly
> after I email this list. It appears to be more a function of the last mile
> cabling to the affected modems. The horribly intermittent nature of the
> problem and variance in the level of diagnostics available with AT command
> set on the different modem chipsets make it hard too.
>
> Appreciate your insights.
>
>
> On Fri, Aug 29, 2014 at 2:12 PM, Andrey Tarasov <andyvt_at_gmail.com> <andyvt_at_gmail.com> wrote:
>
>
> Have you tried setting calling modem to 2400 baud and see if that helps?
> If call is routed via VoIP infrastructure at any point you are most likely
> out of luck getting anything higher. Usual disclaimers about different
> codecs, ymmv, etc.
>
> Regards,
> Andrey.
>
>
> On 8/29/2014 12:55 PM, mdb1986 wrote:
>
>
> Hello Experts:
>
> Does anyone here have a good way to debug a modem handshake? We are
> seeing
> a chronic problem of one modem dialing another modem, we see call "RING"
> on
> the remote modem, but it never connects. Calls seem to be processed out
> our infrastructure fine. Carrier says they are routing as expected. I
> suspect there are some parameters that are not being agreed upon between
> the two devices, but the level of troubleshooting I'm able to do seems
> extremely limited.
>
> A few AT commands which will show you the stats, signal quality, etc., of
> a
> call that connects, but nothing that shows what's occurring as the modems
> are attempting to agree with one another, prior to call connecting.
>
> Thanks in advance.
>
>
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Received on Tue Sep 02 2014 - 15:26:30 ART