[ntp:questions] ACTS / PTB modem refclock

mills at udel.edu mills at udel.edu
Wed Apr 25 15:33:00 UTC 2007


The phone string is copied verbatim to the modem as per Hayes command 
set. You can test by sending the same string to the modem using a 
terminal program. You can also test using the NTP filegen facility and 
flag 4 set on the fudge command. The modem protocol and command 
responses are written to the clockstats file.


Heiko Gerstung wrote:
> Dave,
> thank you for your fast reply. I tried exactly that configuration, but 
> used the PTB phone number (which works in a test with cu, as described).
> When I first did not include the atdt string, ntpd said "no answer" in 
> the syslog. When I include the "atdt" I can see no modem activity at all 
> and I get zero log entries (reach stays at 0).
> I will try again tomorrow morning when I am back in the office and keep 
> you posted.
> Cheers,
>  Heiko
> mills at udel.edu schrieb:
>> Heiko,
>> server minpoll 12 maxpoll 17
>> phone atdt913034944774 atdt917195676742
>> The driver first tries NIST Boulder and if that fails USNO Boulder. 
>> Note from my office it first dials 9 for an outside line, then 1 for 
>> long distance.
>> Dave
>> 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.
>>> Unfortunately the documentation regarding this driver is not that 
>>> detailed and I am therefore looking out for any working example 
>>> configurations of such a driver.
>>> Every time I restart ntpd, it tries to dial out but fails and says 
>>> "no answer", but when I use cu with the very same phone number, it 
>>> works flawlessy.
>>> Any hints?
>>> Regards,
>>> Heiko

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