[Asterisk-Dev] Using linux RTC with ztdummy

Mark Spencer markster at digium.com
Fri May 2 12:44:45 MST 2003


At 1024 Hz, you're going to experience very frequent slips since it's off
by 24000 ppm.  By comparision most oscillators are in the 25-50 ppm.
range.  The USB is a much much better source if you have it, although I
suppose *something* is better than *nothing*.

Mark

On 2 May 2003, Klaus-Peter Junghanns wrote:

> hi guys,
>
> attached you will find a ztdummy replacement that was
> hacked together from the rtc.c in the linux kernel.
> it keeps all the rtc features and adds zaptel timing
> if you set the irq frequency to 1024Hz. see the Makefile...
>
> basically:
> make load
> does the job
>
> regards
> kapejod
>
> --
> Klaus-Peter Junghanns
>
> CEO,CTO
> Junghanns.NET Internet-Services & Software-Development GmbH
> Breite Strasse 13 - 12167 Berlin - Germany
> fon:	+49 30 79705392
> fax:	+49 30 79705391
> mobile:	+49 160 7503372
> email:	kpj at junghanns.net
>
> Am Fre, 2003-05-02 um 16.50 schrieb Brancaleoni Matteo:
> > I was wondering if is possible
> > to use linux RTC to generate timings
> > for zaptel , so switching ztdummy from
> > usb-uhci as timing source to RTC.
> >
> > That could allow us to be free from that
> > usb-uhci thing, and not to have to enable
> > usb only for that. (ideal condition
> > for pure VoIP asterisk installations)
> >
> > Matteo.
> >
> > --
> > Brancaleoni Matteo <mbrancaleoni at espia.it>
> > Espia - Emmgi Srl
> >
> > _______________________________________________
> > Asterisk-Dev mailing list
> > Asterisk-Dev at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-dev
>
>




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