Hi,
Does anybody have experiences -- positive or negative --
using CentOS 2.6.32 with a refclock that generates a PPS signal?
TIA,
Paul
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I'm setting up an NTP stratum-1 server with a Meinberg C51 timecode
receiver.
The problem is that NTP doesn't seem to be accepting data from the
refclock driver.
After running overnight, ntpq -c associations says:
ind assid status conf reach auth condition last_event cnt
Martin,
Many thanks for your invaluable help/vielen Dank fuer Ihre sehr
wertvolle Hilfe!
I was unaware of cu, but I was able to use to to verify that /dev/
ttyS0 was in fact
showing the correct ASCII strings. From there it was relatively easy
to get
everything up running.
Now there are two
On Jan 25, 6:04 pm, unruh un...@invalid.ca wrote:
- The OS (CentOS, which is a close relative of RedHat) deletes
everything in /dev
each time it is booted. Is there some recommended way of setting up
the link
/dev/refclock-0 - /dev/ttyS0?
Put in a new rule into udev to tell it
Hallo Miguel,
Yes -- if TRAIM is configured in a particular way, the PPS
pulse [is] active only when Time RAIM algorithm confirms
time solution error is within the user defined alarm limit.
Can you poll the current TRAIM setup and status
with an @@En command and post the output?
Paul
I installed NTP v4.2.7p244 on my Sun SPARC + Solaris 9 system a couple
of days ago,
and now I have a message in the NTP log file that I've never seen
before:
30 Dec 05:48:51 xntpd[23840]: ts_min 1325220531.588564214 ts_prev
1325220531.588563380 ts 1325220531.588711963
30 Dec 05:48:51
Harlan and Dave,
Many thanks for your explanations.
On the morning of last Monday, 2011-12-27,
I compiled and installed NTP on two Sun/Solaris systems
(each with its own GCC compiler: 3.4.6 and 3.4.2 respectively).
System 'B' logged the 'fuzz' message
at 2011-12-28 18:45:39A
and again at
At risk of stirring up a hornets' nest:
The RFC unequivocally states that A primary server is
synchronized to a reference clock directly traceable to
UTC.
IMO, that is not a necessary condition. If I have a
hierarchy of NTP servers and clients with no external
connection to the Internet and I
Why bother with varicaps and pots when a DS3231 chip will probably do
what you want
straight out of the box? Or are you thinking that you might have to
trim out a
constant frequency offset?
Paul
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Has anybody noticed the first word in cnoyes2's subject line:
Quick ?
NTP can take hours to settle, and is better suited to configurations
where
the computers run 24*7.
How quickly do you need to achieve sync? How often are the PCs
switched off
and cold-started?
Paul
Jean,
It's already been said (and others may say it again) that an NTP
configuration with
two servers is generally considered bad. That's true in the sense that
a
two-server setup won't give you better time than a single-server
setup,
and may indeed give you slightly worse time; you would have to
FWIW, it's possible that the antenna/receiver modules are manufactured
by this company:
http://www.hkw-elektronik.de/
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You could try combining these two Meinberg modules:
http://www.meinberg.de/english/products/gps170.htm
http://www.meinberg.de/english/products/sim77p.htm
Paul
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Another possibility would be to use the output from your Linux box
as input to a Meinberg GEN77, then feed the output of the
GEN77, i.e. the DCF77 code bits, into a SIM77P.
Paul
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Pete,
When you write ...device that can output a
DCF-77 signal to a number of clocks do you mean
the coded bitstream (aka 'telegram') or the modulated
77.5kHz RF signal?
Paul
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Many of us use a GPS-disciplined oscillator, namely a computer's
system clock, as the basis for NTP operation. So hopefully this
paper is not too far off-topic for interested techies:
http://www.analog.com/static/imported-files/application_notes/AN-1002.pdf
@Poul-Henning Kamp: Are you following this thread?
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