-------- In message <[email protected]>, Mike Cook writes:
>> I'm using a soekris net4501 that I hacked according to >> http://www.febo.com/time-freq/ntp/soekris/ >> Recenlty I felt the need to add hardware sawtooth correction. For the net4501 that is probably a bad idea. When you do the sawtooth correction in software, the hw-component acts as a jitter to smooth out the net4501's ~120nsec timestamping window. Without this jitter, you will have the timestamps sit in the same window for long periods of a time and then suddenly switch to to the neighboring window rather rapidly. With the jitter the switch gets "smeared" out over a longer period of time, which is a more sensible input to a PLL. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
