If you have a DVB card in your system, an alternative to the NTP protocol is to use the time signal delivered over the DVB signal. If you have a Linux PVR set up, then I strongly advise using the DVB time signal instead of NTP to ensure you are synchronised with your DTV providers time, to help ensure you dont drop any bits at the beginning or end of the recording. These DVB time signals are usually synchronised with an atomic clock (depending on DTV provider) so are highly accurate.
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