[ntp:questions] ACTS / PTB modem refclock

Heiko Gerstung heiko.removethistext.gerstung at meinberg.de
Wed Apr 25 07:58:25 UTC 2007

Uwe Klein schrieb:
> Danny Mayer wrote:
>> Heiko is trying to do this from Germany so it would need an additional
>> international dialing code, with possible pauses required for modem
>> synchronization. Who knows what else is going on.
>>> Heiko Gerstung wrote:
>>>> Hi!
>>>> I am currently trying to setup a box which uses the ACTS refclock 
>>>> driver to use the PTB modem service as a time source.
> I thinks "B1 : US answer tone" is the culprit.
> uwe
> <from refclock_acts.c>
> /*
>  * Modem setup strings. These may have to be changed for some modems.
>  *
>  * AT   command prefix
>  * B1   US answer tone
>  * &C0  disable carrier detect
>  * &D2  hang up and return to command mode on DTR transition
>  * E0   modem command echo disabled
>  * l1   set modem speaker volume to low level
>  * M1   speaker enabled until carrier detect
>  * Q0   return result codes
>  * V1   return result codes as English words
>  */
> #define MODEM_SETUP     "ATB1&C0&D2E0L1M1Q0V1\r" /* modem setup */
> #define MODEM_HANGUP    "ATH\r" /* modem disconnect */

I ran into that problem before I was even able to try to dial out.

The hardcoded init string did not work at all (setup error), therefore I 
changed that to "ATZ" (which is what I use when I tried it with cu).

It does not work. I am checking it with -d now ...

Best Regards,

More information about the questions mailing list