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[vdr] Re: Time jumps
Sergei Haller wrote:
>does someone have more information on the transmitted time stamp?
>
Do you mean
- PDC? ()
(transmit hours, minutes seconds)
(ETSI EN 300 231 V01.03.01)
- Teletext - E.14 Real-time clock Page Header Packets
(transmit hours, minutes seconds)
(ETSI EN 300 706 V01.02.01)
- SI TDT UTC Time (Page 23 ff)
(ETSI EN 300 468 V01.04.01)
> - which format does the time stamp have? does it include microseconds (I
> doubt it makes sense to transmit them because of the different lengths
> between the sat and the dish depending on the geographic location, but
> who knows?
>
As for the above standards , no microsecs.
> - how accurate is the time stamp within one transponder?
> does it jump back and forward?
>
>
It should not, but how knows?
Someone with more knowledge should answere this.
Maybe mod dvbsak and monitor some Transponder?!
>one possibility would be to do the following:
> if the system clock is off by at least XX seconds (what is a good
> value? 2? 10? 20?), then set the clock, causing a time jump on the
> system clock.
> if the diff is less than XX seconds, use adjtime.
>
>with that, if one uses always the same transponder for time synching and
>the transmitted time is not jumping, after some while the system time
>should get more and more correct (like with ntp)
>
>c ya
> Sergei
>
>
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