128 3776.066 -0.228 0.660
*GPS_NMEA(0) .PPS.0 l2 64 3770.000 -0.001 0.001
I'm fairly sure that there should be a lower case o to the left of GPS_NMEA,
and there is not.
Am I right to be worried?
Thanks again!
Paul.--
This message (and any attachments
Please note, I have not done any recompiling of the kernel at this stage
- just using the GENERIC kernel, because after reading the comments from
Per Hederland in the System software customisation section of the above
web page, it seemed unnecessary. Comments?
Thanks for your help!
Paul.
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Paul Sobey wrote:
Our internal testing to this point is that a stock ntpd pointed against
a stratum 1 clock on a low contention gigabit ethernet (stratum 1 source
and client less than 1ms apart) reports its own accuracy at approx 200
microseconds. Further tuning the ntp config by adding
the remaining
offset was no longer a good measure. The offset on a locked up system should
be several times larger than the RMS error in the actual system time.
Understood, at least in part. I have a nice Christmas reading list of man
pages and white papers!
Cheers,
Paul
, and praying that the hosts have a serial port
connection!
Well that's the rub - some of them don't :) If nothing else it might
inform new hardware purchases though. Some of these sites vary in their
willingness to allow GPS antenas on roofs as well, joy.
Cheers,
Paul
On Friday 23 December 2011 03:25:18 Dave Hart wrote:
On Thu, Dec 22, 2011 at 19:11, Paul Sobey bud...@the-annexe.net wrote:
- can ntpd's own reported offset (ntpq -p or loopstats) be trusted
(assuming high priority means it gets scheduled as desired)? I've
quoted
our apparent numbers
got my first CD drive (a Mitsumi) in the
early 90's onto an i386sx running at 20MHz with about 4MB of RAM (in
SIP modules).
Thanks for all your help so far,
Paul.
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On Tue, 2011-12-06 at 19:31 +, unruh wrote:
On 2011-12-05, Duncan, Paul A. p...@noc.ac.uk wrote:
Hello,
I am trying to set up an NTP server using the Garmin GPS-18 as the
reference clock. I think I'm most of the way there, but I have a couple of
questions.
Firstly, here
think this *may* be because I have not added the ATOM driver during
the configure, so that is what I will try now.
Thanks for all your help so far.
Best Regards,
Paul.
On Wed, 2011-12-07 at 21:25 +, Harlan Stenn wrote:
Paul wrote:
somebody wrote
my questions:
1) Is ntpd getting the PPS information?
2) Should I put the ldattach 18 /dev/ttyS0 command in rc.local - currently
I'm running it manually after each boot.
Thanks!
Paul.--
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the software. I think I just used --
enable-NMEA. Should I have done something else?
Thanks!
Paul.
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Hello Miguel,
On 6 Dec 2011, at 16:00, Miguel Gonçalves wrote:
Beware: long e-mail ahead!
LOL! Wasn't that long :-)
On 6 December 2011 14:49, Paul Duncan p...@noc.ac.uk wrote:
Hi Miguel,
Thanks very much for getting back to me.
No problem. I've been helped before so I'll do my best
2009/10/17 Dave Hart daveh...@gmail.com:
On Mon, Sep 14, 2009 at 11:23 AM, Paul Fleischer p...@xpg.dk wrote:
I would like to see ntpd support unprivileged operation for testing
purposes, including using a local port 1024. The approach I have
been considering is adding a port option
functionality. I am using ntp-dev-4.2.5p82, and apply the patch
attached listed below to change the network port. Can anyone help me
solve this problem?
Cheers,
Paul
diff -urN unmod/ntp-dev-4.2.5p82/include/ntp.h ntp-dev-4.2.5p82/include/ntp.h
--- unmod/ntp-dev-4.2.5p82/include/ntp.h2007-10
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On Jul 26, 12:30 am, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
paul wrote:
[]
Thanks, but I mean something which do not rely on the output of
ntpq.exe.
My NTP Monitor uses NTP network calls to determine the offset of the PCs -
it doesn't use
Although you might be able to drive a real (non-USB) parallel port, from
application code, with fairly low latency the results would only be
meaningful for a very unloaded machine, as, on a loaded machine, you
wouldn't really know where you where in the system tick interval, when
you read the
On Jul 21, 1:55 pm, David J Taylor david-tay...@blueyonder.not-this-
part.nor-this.co.uk.invalid wrote:
paul wrote:
[]
10 Windows boxes with offset no greater than 5 ms from abs time is
fair enough for me. I will try a local stratum-1 NTP server.
Cheers,
Paul
Paul,
Just
On Jul 25, 11:38 pm, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
paul wrote:
[]
Hi David, I am wondering is there any other means to profile NTP
performance, like some kind of hardware setup to measure time offset
of two machine?
I wrote some
Hi All, I'm new to NTP, glad to meet you here.
I did some experiments to test NTP performance on WINNT. In an
isolated network, two machines are inter connnected with a switcher.
Machine A is configure as a stratum 12 NTP server, using lcl as
reference clock; machine B is sychronized to machine
On Jul 20, 8:38 pm, T g41...@motorola.com wrote:
Greetings:
We have about 50 Linux/Solaris/Windows boxes running ntpd at several
different sites. Some of the systems from time to time go out of sync.
My question is there a way to test ntpd machines are all in sync with
the master
server?
On Jul 20, 10:36 pm, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
paul wrote:
Hi All, I'm new to NTP, glad to meet you here.
I did some experiments to test NTP performance on WINNT. In an
isolated network, two machines are inter connnected
On Jul 20, 11:45 pm, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
paul wrote:
[]
Thank you, David.
In my situation, no GPS is availiable. So can I expect better
performance when GPS is used as reference clock, or when a stratum-1
NTP server
Joseph,
If you're not willing to get the source code for NTP and compile it,
you can download a binary from http://www.sunfreeware.com/.
It's probably configured with a 'standard' set of
refclock drivers and, as a consequence, may be larger
than a custom-configured version.
Paul
configured with a 'standard' set of
refclock drivers and, as a consequence, may be larger
than a custom-configured version.
Paul
How important is size in today's Sun's systems, or even ones a few years
old? The ntpd file I see is less than 0.5MB (admittedly Windows
version), and occupies
reception improves.
Paul
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Goran,
Under normal running conditions, NTP exchanges a pair of 90-byte
packets every 1024 seconds.
That's traffic over the wire amounting to about 1.4 bits per second.
Is that acceptable, or are you really insisting that the traffic must
be
zero bps?
Paul
See also:
http://support.ntp.org/bin/view/Support/QuickStartIndex
Paul
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For Switzerland:
http://www.metas.ch/metasweb/Fachbereiche/Zeit_Frequenz
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It's also possible to buy NTP appliances, some of which are basically
just what you describe: a GPS coupled to an SBC.
See for example http://www.meinberg.de/english/products/lantime-m300-gps.htm.
Paul
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See http://www.eecis.udel.edu/~mills/leap.html.
That would seem to be the authoritative source.
Paul
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seconds.
In the TAI time scale, the minute, hour, day, week are of
constant duration.
Paul
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Folkert,
Take a look at http://www.cnssys.com/cnsclock/CNSClockII.html.
Paul
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?
Are you using the PPS signal?
It might be useful if you could post the ntp.conf file
and the output of ntpq on the stratum-1 server that
has the GPS refclock.
Paul
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work just fine, if that's where you want to put your config
file.
Paul
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once per second and use this information to synchronize your
server's system clock. For more details, see Dave Mill's
excellent pages at
http://www.eecis.udel.edu/~mills/database/brief/overview/overview.ppt
etc.
Paul
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to configure
and compile the source files in order to include support for your
refclock.
If you ask us specific questions, we can help you better.
Paul
On Jan 30, 8:16 am, noosh [EMAIL PROTECTED] wrote:
Hi
I Have a GPS and NTP Server. is it possible for NTP server to get time
from GPS if i
To allay suspicions that this newsgroup might be biased pro-Meinberg,
I'll just add that PCI cards are also available from Hopf: http://ww.hopf.com/.
Paul
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/show_bug.cgi?id=893 for
details.
Paul
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://tycho.usno.navy.mil/gps_datafiles.html.
Paul
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NTP.
Paul
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to poll all its servers more-or-less simultaneously,
causing
bursty network traffic. See
http://www.eecis.udel.edu/~mills/ntp/html/ntpd.html#op: In order to
protect the network from bunching, the initial poll interval for each
server is delayed an interval randomized over a few seconds.
Paul
Jussi,
If you have two requirements:
1. You want to use NTP (or some derivative of NTP),
2. You want tight control over the timing of the polling,
then I would suggest that these two requirements are mutually
incompatible.
Paul
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