[time-nuts] Re: dial-up time source for NTP

[Todd Smith]

Richard,

I would respectfully disagree with the last statement, "If you are doing
this for an reason other than 'because I can" fun, you're probably doing it
wrong."  IMHO, the time community should diversify as many sources as
possible that don't rely on GPS or the Internet.

I think that we should be using as many sources as possible so that NTP has
as much data as possible to select the "goodchimer" from.  Yes, using a
modem for PTP or 1PPS might not be the best option but modems and LFR are
still good diverse options.

Thank you for your thoughts
Todd

On Tue, Sep 13, 2022 at 1:53 PM Richard Laager via time-nuts <
time-nuts at lists.febo.com> wrote:

> On 8/9/22 22:16, halmurray at sonic.net (Hal Murray) wrote:
> > I haven't heard any mention of that in ages.  NTPsec dropped that driver
> (and
> > many others).
>
> I believe Hal is incorrect. NTPsec has not removed this driver. It's the
> "modem" driver.
>
> If you're using Debian, it is not compiled into the ntpsec package (per
> my choice, as I'm the maintainer). But it does work if you build from
> source. Or at least it did the last time I played with it, a couple
> years ago:
> https://lists.ntpsec.org/pipermail/devel/2020-September/009537.html
>
> The most relevant git commit was to add this example config snippet:
>
> refclock modem mode 1 minpoll 12 maxpoll 17
> phone ATDT13034944774 # NIST
>
> I hope that helps.
>
> If you're doing this for any reason other than "because I can" fun,
> you're probably doing it wrong. Use GPS or the Internet for production
> stuff. But have fun!
>
> --
> Richard
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