It looks very much same as a Conrad module.
On NetBSD I use radioclkd2 with the shm driver.
From here DCF77 was not very reliable and faded. I replaced
xtal and aerial with 60kHz versions.
David
Thanks, David. Useful though that may be, I don't think it applies to the
Windows port.
The Windows port of ntpd is not currently built with support for
drivers 8 or 44, but it does have support for drivers 38 and 39. To
determine for yourself is not trivial but can be done following the
trail of crumbs in the source code. First look at refclock_conf.c to
map the driver number to
Even when completely idle, ntpd wakes up every second and does quite a
lot (updating timers, scanning the peer hash table, etc). I'd say that
starting ntpd two times per day will take much less resources than
running it continuosly.
--
Miroslav Lichvar
Have you ever measured the resources used
For notebook users running ntpd only as an NTP client the extra wakeup
per second may make a measurable difference in battery life.
I was just pointing out it will take more resources than ntpd -q run
twice a day. Of course, the accuracy will be orders of magnitude
worse than continuosly running
How much CPU it has used right after start? Is it more than fifth of
the 0.484 (which would be spent in 0.5 days)?
I don't know. On another, less powerful, single-core PC, it's used 3.5s
total CPU since December 24.
Here, ntpd -q takes 14 milliseconds of CPU, including system time.
Note
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnij2ign.o9d.un...@wormhole.physics.ubc.ca...
[]
Is the start of the nmea sentect coming more than one second after the
PPS signal? Or is it just ending at the one second mark?
The start of the NMEA sentence can be /after/ the
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnij3r1n.a4g.un...@wormhole.physics.ubc.ca...
[]
Your referent is somewhat unclear.
If you are saying that your unit is out of spec, then return it.
When operated with earlier firmware, the unit is in spec, but may be out
of spec
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnij3r8s.a4g.un...@wormhole.physics.ubc.ca...
[]
So you are separating the PPS from the nmea, and wondering how to get
them together again? The best way is for the same program to look at the
PPS and the nmea so it can associate them.
Folks,
You may recall that I had a problem with a Garmin GPS18x LVC after
firmware upgrades, where the offset between the leading edge of the PPS
signal and the end of the NMEA serial data exceeded one second. With some
help from Hal Murray who knows more of NTP than I do, we have worked
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnij14l6.qns.un...@wormhole.physics.ubc.ca...
[]
Well 17ms would get you under the 1.0 sec cutoff.
It seems that with ntpd there is no 1.0 sec cut-off - fortunately.
Cheers,
David
___
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnij219b.cr7.un...@wormhole.physics.ubc.ca...
[]
The shmslp driver does something similar. It uses some other source to
get the seconds right and then hands over to the PPS to get the
nanoseconds right. But it uses only the PPS pulse,
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnij1g6n.mnc.un...@wormhole.physics.ubc.ca...
[]
??? There is a program which takes the PPS signal and takes the nmea
sentence and tells ntpd how much out the computer clock is from the true
time. If you are not using gpsd, you are
In fact I've heard of *nobody* except you, me, Danny, and Terje building
ntpd on Windows ;-)
[]
Regards,
Martin
Martin,
I did attempt to do this with considerable help from the folk here, and I
think I even got as far as set of executables once, but as I'm not a C/C++
person, the effort
Hm, I recently found that at least under Windows Server 2008 x64 the
QueryPerformanceCounter (QPC) call is obviously emulated when running 32
bit applications on this 64 bit system.
My wclkres program (32 bit binary)
http://www.meinberg.de.www/download/utils/windows/wclkres-1.4.zip
reports a QPC
[]
I believe so, to the extent you can load the driver at all: Most new
Windows installations are x64, and Microsoft makes it enough of a pain
to use unsigned drivers on 64-bit versions of Windows that I suspect
it's impractical for unattended use. I believe unsigned drivers are
still allowed
Rob nom...@example.com wrote in message
news:slrnihlurn.9vm.nom...@xs8.xs4all.nl...
[]
Technically, the timestamps in the NMEA messages are the time of fix,
not the current time. So a receiver can rightfully keep a calculated
fix in memory and send it at some later time, with the timestamp of
Q @.. wrote in message
news:4d18cb5a$0$12172$fa0fc...@news.zen.co.uk...
I wonder if someone would be kind enough to help me out a little here. I
have done lots of googleing and found nothing that helps me out with the
issues I'm seeing.
I am trying to reduce the PPS offset delay (Which
David Lord sn...@lordynet.org wrote in message
news:6utou7-ut8@p4x2400c.home.lordynet.org...
[]
I think it's dependent on the ntpd version as to best
settings. I was using fudge 127.127.20.0 time1 0.650
and checking stats to make sure NMEA offset remained
low. That was with ntpd 4.2.4p6-o.
ntpd timestamps the CR/LF at the end of each NMEA sentence. According
to this thread:
http://www.febo.com/pipermail/time-nuts/2010-December/052859.html
the latest (3.50) firmware for the Garmin GPS 18x LVC shifts the NMEA
generation even later in the second. You might want to try reverting
to
Folks,
Following my previous message, I can confirm that the NMEA output from the
GPS18x LVC with the firmware 3.50 upgrade is coming out something like a
second after the PPS signal, and worse, it's very variable so sometimes
just before the PPS leading edge, and sometimes after. No wonder
Brolin Empey bro...@brolin.be wrote in message
news:nssmo.1329$317.1...@newsfe20.iad...
[]
My RTC already runs in UTC, but my RTC is approximately 2 minutes behind
because I have no way of writing the Windows NT system time to the
hardware clock (RTC) after using an NTP client to synchronise
Rob nom...@example.com wrote in message
[]
Why would you want to use a NTPv4 reference implementation on a
Microsoft
system?
1 - so that all systems interwork correctly with other servers and
networking kit.
2 - so that your management tools are consistent throughout the
organisation,
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:ide3nn$6j...@news.eternal-september.org...
[]
To a large extent I would agree with you, but the net effect of this is
to say if you work for a marketing led company (probably true of most
of the Fortune 500), do not use NTP as
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:idefp2$se...@news.eternal-september.org...
David J Taylor wrote:
of the application. Many of the electronics designers used UNIX
systems
That makes you unusual for a modern Western company. Most are in
financial services
Folks, I have received this notification:
Notice of Interruption to MSF 60 kHz Time and Frequency Signal
The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio
Station will be shut down over the period:
9 December 2010: from
Okay, but surely the version isn't causing this problem?
Cheers,
Stephen
I don't know, Stephen, but a lot has been fixed in over four years of
development.
(Thanks for the pointers to the version dates.)
Cheers,
David
___
questions mailing
Connectivity is fine to the ntp servers, if I restart ntpd it starts
syncing with an external clock immediately. This article could be the
fix:
http://www.novell.com/coolsolutions/feature/15345.html
Cheers,
Stephen
Thanks, Stephen. I don't like that solution, as it imposes more load than
E-Mail Sent to this address will be added to the BlackLists
n...@blacklist.anitech-systems.invalid wrote in message
news:iav1nt$re...@news.eternal-september.org...
David J Taylor wrote:
David Woolley wrote:
As to Linux, I would guess most users of ntpd are using Linux.
Any figures to back
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:iasmhg$52...@news.eternal-september.org...
[]
As to Linux, I would guess most users of ntpd are using Linux.
Any figures to back that up? Within my community of several hundred
users, almost all are Windows, but behind
Kevin Oberman ober...@es.net wrote in message
news:20101030210512.4c7bd1c...@ptavv.es.net...
[]
- no drift file appears to be specified (although it is mentioned) - I
had:
driftfile /var/db/ntp.drift
That is because FreeBSD does this in the /etc/defaults/rc.conf file
(with the ability to
This is a FreeBSD documentation and FreeBSD comes with a pretty good
default ntp.conf, much like several of you have suggested.
You can find it
at:http://www.freebsd.org/cgi/cvsweb.cgi/src/etc/ntp.conf?rev=1.2.2.1.4.1;content-type=text%2Fx-cvsweb-markup
It has mostly comments with just a set of
David Lord sn...@lordynet.org wrote in message
news:t06tp7-n0b@p4x2400c.home.lordynet.org...
[]
You've hit on why it's difficult to have a generic ntp.conf.
It's not just ntpd version specific but operating system version
specific.
I swapped my NetBSD systems to FreeBSD after NetBSD-1.6x
Because it's not a bug. There are different ways of controlling clock
adjustments (Phase Locked Loop vs Frequency Locked Loop), and the
FreeBSD kernel will switch between them depending on how often adjtime()
is being invoked. The only real issue is that logging about it can be
annoying, but
I had much better luck with the ntp documentation that comes with
FreeBSD:
http://www.freebsd.org/cgi/man.cgi?query=ntp.confsektion=5
[]
--
Florin Andrei
http://florin.myip.org/
Thanks for the pointer, Florin. I'll bookmark that! It looks very
comprehensive, and yet not a single example
Richard B. Gilbert rgilber...@comcast.net wrote in message
news:odwdnzry_vhmblfrnz2dnuvz_h-dn...@giganews.com...
[]
The trouble with a working example file is that too many people will
simply copy it. The likely result would be to overload every server
named in the example file. Also, the
Miroslav Lichvar mlich...@redhat.com wrote in message
news:20101025164632.ga1...@localhost...
On Fri, Oct 22, 2010 at 11:39:47AM +0100, David J Taylor wrote:
Thanks, Dave. I may be missing something here, but it seems to me
that 4.2.7p58 still takes a number of hours to reach the accuracy
Dave Hart daveh...@gmail.com wrote in message
news:aanlktik1pda81pqmx2jntgv9ays6h7haht3+zelf+...@mail.gmail.com...
[]
No new settings required. You might have a hard time picking out the
difference using 5-minute samples of mrtg and the hardcoded Y axis.
Looking at loopstats graphs, I would
Evandro Menezes evan...@mailinator.com wrote in message
news:f13f950a-3168-4a11-ba09-f4d225e7b...@t13g2000yqm.googlegroups.com...
On Oct 22, 10:23 am, David J Taylor david-
tay...@blueyonder.co.uk.invalid wrote:
That could explain why I see higher NTP jitter on a Windows system
running
a USB
Dave Hart h...@ntp.org wrote in message
news:aanlktim62cnx2at=n9s8fqjqe0+-qahsr00hamxnp...@mail.gmail.com...
[]
It may be the (64 bit) qualifier is key. I know 32-bit ntpd runs on
x64 Windows, but I have no experience to know how it compares to
running on 32-bit Windows. I wouldn't expect
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:i9omts$7s...@news.eternal-september.org...
Richard B. Gilbert wrote:
Also note that Windows' clock ticks every 17 milliseconds.
Only when not running ntpd. ntpd forces the use of multimedia timers.
.. and not when running
Joseph Gwinn joegw...@comcast.net wrote in message
news:joegwinn-da4b7b.23340420102...@news.giganews.com...
In article i9mqek$tr...@news.eternal-september.org,
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
I have a small network of Windows XP (64 bit) running simulations
E-Mail Sent to this address will be added to the BlackLists
n...@blacklist.anitech-systems.invalid wrote in message
news:i9nkk1$oe...@news.eternal-september.org...
By default, the timer resolution 15.625 ms (1/64 second),
... increase the timer resolution.
Current PCs' HPET timer is in the
4.2.7p52, p53, and p54 each had initial convergence improvements from
Dr. Mills. I encourage you to play with 4.2.7p54 or later and see for
yourself. ntpd now eliminates the majority of the startup offset in 5
minutes (with a drift file) or 10 minutes (without). During the
startup period, the
The platforms in question are running Windows XP, not Vista or Windows
7. How does this change the answer?
NTP will switch on the multi-media timers in Windows XP and achieve the
best performance I have seen on Windows systems. Temperature (or perhaps
CPU load causing temperature change in
Dave Hart h...@ntp.org wrote in message
news:aanlktik573dg1o5+rqzgyyxi3-9kjnautawgcolfq...@mail.gmail.com...
[]
4.2.7p52, p53, and p54 each had initial convergence improvements from
Dr. Mills. I encourage you to play with 4.2.7p54 or later and see for
yourself. ntpd now eliminates the
I have a small network of Windows XP (64 bit) running simulations, with
NTPv4 running on all the boxes and using a GPS-based timeserver on the
company network. The ping time to the server is 2 milliseconds from my
desk, but I'm seeing random time errors of order plus/minus 5 to 10
milliseconds,
Kasper Pedersen n...@taur.dk wrote in message
news:4c9a2c12.5010...@taur.dk...
(Initially posted to LinuxPPS. Dave Hart suggested some denizens of
questions@ may be interested too.)
[]
/Kasper Pedersen
Yes, thanks for posting. For a device specified as one microsecond
(IIRC) it does well.
Daniel Havey dha...@yahoo.com wrote in message
[]
So, you think that a PC clock will drift 20-50ms in 5 seconds? Seems
like a lot, but whatever. Let me see if I've got this right, you tell
me I might get say synchronization of ~10ms with ntpd running on a lan
with everybody on the same
The offsets on that graph are the sorts of value you would get using
ntpdate, although ntpdate will be worse, as its pre-filter is done over
a very short time, so will be more likely to be sensitive to time
corellated errors.
The actual time for ntpd should be considerably more accurate.
The
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:i72065$4a...@news.eternal-september.org...
David J Taylor wrote:
Please check the scales. I very much doubt that ntpdate would achieve
the 5-10 microsecond accuracy shown by PC Pixie:
http://www.satsignal.eu/mrtg
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:i72tr6$4s...@news.eternal-september.org...
[]
I think you miss the point.
Quite possibly, it des get a bit esoteric at times!
ntpd does better because the disciplined clock time is about an order of
magnitude more accurate
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrni7o9im.7k3.un...@wormhole.physics.ubc.ca...
[]
Yes, in the case of chrony, much better all around. (speed,
accuracy,stability)
Does chrony work on Windows?
___
questions mailing list
'ntpdc -c monlist' is your friend, it will list the last 600-700
clients.
If you have a lot more clients than this, then you'll have to either
install a new/dev ntpd version or insert WireShark or a similar sniffer
on a mirror of the server switch port.
Terje
Terje,
I just tried this on
On Wed, Aug 25, 2010 at 3:52 PM, David J Taylor
david-tay...@blueyonder.co.uk.invalid wrote:
'ntpdc -c monlist' is your friend, it will list the last 600-700
clients.
If you have a lot more clients than this, then you'll have to either
install a new/dev ntpd version or insert WireShark
I have received the following:
__
Notice of Interruption to MSF 60 kHz Time and Frequency Signal
The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio
Station will be shut down over the period:
9 September 2010
from 10:00 BST
No, this was the replacement to the TS2000. Completely different
cpu/os/codebase. And it came out in 1996 which just goes to show how
old that TS2000 is.
Sorry I couldn't help.
Cheers,
David
___
questions mailing list
questions@lists.ntp.org
Danny Mayer ma...@ntp.org wrote in message
news:4c5e353f.5000...@ntp.org...
[]
Which Dave Hart and I have. We did most of the work here but I seem to
remember someone else did some too and it may not have been tested
properly at least on Windows.
[]
Danny
I've worked with Dave Hart on quite
Niki Kovacs mic...@mouse.com wrote in message
news:4c567a3d$0$24091$426a7...@news.free.fr...
[]
1) I'm trying to impress my girlfriend by typing loads of unnecessary
restrict statements in my ntp.conf.
2) I'm desperately trying to get rid of a compulsive obsessional
disorder, and I thought
Rob nom...@example.com wrote in message
news:slrni5d1ia.d49.nom...@xs8.xs4all.nl...
[]
I would not recommend to use the pool, but either try to find the money
required for a local clock receiver (which I can understand could be
very difficult in a bank), or else configure a couple of fixed
Ryan Malayter malay...@gmail.com wrote in message
news:aanlktinst0mnpjepsnfj+e_zd4qpy7yane91tjt5u...@mail.gmail.com...
On Mon, Aug 2, 2010 at 6:18 AM, David J Taylor
david-tay...@blueyonder.co.uk.invalid wrote:
On the other hand, I
don't have any untrustworthy users on that LAN either.
Oh
Richard B. Gilbert rgilber...@comcast.net wrote in message
news:ioednxh_-zfymsjrnz2dnuvz_hsdn...@giganews.com...
[]
Be prepared to wait as long as ten or twelve hours to get really close
synchronization. NTP was never intended for systems running only eight
hours a day. You can be close in
Richard B. Gilbert rgilber...@comcast.net wrote in message
news:opidnyn0gy9xksjrnz2dnuvz_usdn...@giganews.com...
[]
If your definition of close is used, you hardly need NTP. My PC
running Windows/XP SP3 is within a few milliseconds running nothing more
than W32TIME.
What accuracy is
Rob Neal hun...@comcast.net wrote in message
news:20100726231053.ga78...@coyote.localhost.org...
[]
The 'trap' configuration file command may provide something useful.
It's not an API, but it notifies a listener of various ntpd events.
Sounds like one for SNMP .
David
Terje Mathisen terje.mathisen at tmsw.no wrote in message
news:kmluh7-5ea@ntp.tmsw.no...
David J Taylor wrote:
[]
Interestingly, on my own FreeBSD system I have no time offset fudge:
server 127.127.20.1 mode 0 minpoll 4 maxpoll 4 prefer
fudge 127.127.20.1 flag1 1 flag3 1 refid PPS
My
Terje Mathisen terje.mathisen at tmsw.no wrote in message
news:5dbth7-6k8@ntp.tmsw.no...
[]
55401 183.702 127.127.20.0
$GPGGA,000303,5955.1025,N,01038.4599,E,2,06,2.0,33.1,M,39.8,M,,*77
Yes, that is the location of the metal bracket on the east end of my
roof. :-)
Terje
59.918375N
Laurent Archambault archi.laur...@gmail.com wrote in message
news:aanlktimrncond6x5r1_ikz7w4mz7-ezdu52kb51kc...@mail.gmail.com...
Thanks a lot,
I known your workaround for NTP, and same in the mailing list NTP, and
your
are in my documentation too.
Utils links : -- Divers programmes de «
Rhys u...@mailinator.org wrote in message
news:mpg.26b2ab4834c891f2989...@news.optusnet.com.au...
[]
Just noticed sync_uhf_radio as well, no radio service here in Aus :)
What frequency band do you imagine GPS works in? Why, the UHF band
(300MHz-3GHz) of course!
David
ARCHI archi.laur...@gmail.com wrote in message
news:0e10346c-cc33-4a10-8f36-8c88403dd...@k19g2000yqc.googlegroups.com...
Sorry all in French language...sorry
NTPGraffe rassemble 3 scripts en Perl, et une interface WEB pour
visualiser différents graphiques (RRDTool) liées à des serveurs NTP,
Rhys u...@mailinator.org wrote in message
news:mpg.26b01082c6206af6989...@news.optusnet.com.au...
[]
I'm amazed it quickly converges, using separate NMEA and PPS on mine,
with the correct offset, and correct drift file, its an hour or 2 before
it finishes going 500ppm/step/500ppm/step.
With a
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote in message
news:i23pmn$d3...@news.eternal-september.org...
Rhys u...@mailinator.org wrote in message
news:mpg.26b01082c6206af6989...@news.optusnet.com.au...
[]
I'm amazed it quickly converges, using separate NMEA and PPS on mine
Rhys u...@mailinator.org wrote in message
news:mpg.26b018b8126a17a1989...@news.optusnet.com.au...
[]
Sorry I should have said, GPS18x. Now that its stabilised its still 20-
80ms positive out in ntpq, so either my offset didn't actually change,
or in the wrong direction.
For NMEA alone, no
Rhys u...@mailinator.org wrote in message
news:mpg.26b04c33cb5a4ecb989...@news.optusnet.com.au...
[]
Using both 20 MMEA and 22 PPS references. PPS turned off on the NMEA,
Kernel mode on the PPS. They seem to operate almost independantly. PPS
has zero reach, with no 'when' time, for about 1/2
ESA announcement:
_
A fascinating new experiment that will expand the range of research on the
International Space Station was given the green light last Friday with the
signature of the ACES atomic clock contract.
Read more and watch a video:
jimmyterrence jimmyterre...@gmail.com wrote in message
news:a8402956-55da-4990-bf95-42a7a2641...@c10g2000yqi.googlegroups.com...
[]
I'm in the process of compiling 2.6.34.1 on a Debian Lenny system that
I had as a spare. I want to see if my problems carry over to a
different machine. If it
Is there a maximum fudge value above which the NMEA refclock throws
away input? Both my 18xLVC GPS receivers output serial data about 550
ms after the PPS signal. That works fine with gpsd, but I've been
trying to set up the NMEA driver with pps compiled in the 2.6.34
kernel and it doesn't seem
jimmyterrence jimmyterre...@gmail.com wrote in message
news:1c01938f-d43e-4dea-a143-45e096d31...@j8g2000yqd.googlegroups.com...
[]
If it was triggering on the wrong edge of the pps signal, wouldn't it
be off of the rest of the servers by the length of the pulse? I think
that it's triggering
This time from a paper notification from the NPL, not an e-mail
MSF Anthorn will be off the air:
Monday July 26 - 08:00 BST to 20:00 BST
Tuesday July 27 - 08:00 BST to 20:00 BST
to allow maintenance work to be carried out in safety.
Cheers,
David
No, currently it's Linux only. Someone would have to add Windows
versions of all required system calls. Also, ntpd might need some
patching if the Windows version uses tricks like getting time with the
rdtsc instruction instead of making a system call.
--
Miroslav Lichvar
Thanks, Miroslav.
Miroslav Lichvar mlich...@redhat.com wrote in message
news:20100628083857.gc21...@localhost...
I've been working on a simulator that I think might be useful for NTP
developers and advanced users looking for optimal configurations.
http://fedorapeople.org/~mlichvar/clknetsim/
clknetsim is a
Steve Kostecke koste...@ntp.org wrote in message
news:slrni1tbbt.fk7.koste...@stasis.kostecke.net...
On 2010-06-18, David J Taylor david-tay...@blueyonder.co.uk wrote:
I would welcome SNMP in NTP and have said so on a number of occasions.
There is an ./ntpsnmpd directory in ntp-dev and ntp
Steve Kostecke koste...@ntp.org wrote in message
news:slrni1ukvt.vh7.koste...@stasis.kostecke.net...
[]
You could file an enhancement request in our BTS (at
http://bugs.ntp.org) to let our developers know that you'd like to
have this feature added. But, unless people step up to the plate and
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:hvgor5$8h...@news.eternal-september.org...
[]
The reference version was available for the Windows NT family long
before W32Time. It was available for versions of NT that never had
W32Time.
Interesting, David. The earliest
Rob nom...@example.com wrote in message
news:slrni1p277.kei.nom...@xs8.xs4all.nl...
[]
Windows NT had a time service, but at that time it was still called
TIMESERV. It had its config in TIMESERV.INI instead of in the registry.
I guess it was a left-over from the times before the registry.
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:hvi540$s8...@news.eternal-september.org...
Rob wrote:
Windows NT had a time service, but at that time it was still called
TIMESERV. It had its config in TIMESERV.INI instead of in the
registry.
It also wasn't based on NTP
Rob nom...@example.com wrote in message
news:slrni1p6rl.m7v.nom...@xs8.xs4all.nl...
David J Taylor david-tay...@blueyonder.co.uk.invalid wrote:
David Woolley da...@ex.djwhome.demon.invalid wrote in message
news:hvi540$s8...@news.eternal-september.org...
Rob wrote:
Windows NT had a time
Marcelo Pimenta marcelopiment...@gmail.com wrote in message
news:aanlktilffevh94cief43-ewqbc2dtqev4dbbpfs1d...@mail.gmail.com...
[]
Yes, I agree. But we were talking about NTP using Ethernet, so... that's
impossible
Even with Ethernet, temperature variations at the client will have a
Richard B. Gilbert rgilber...@comcast.net wrote in message
news:fcgdnxzbxfvy7ifrnz2dnuvz_sadn...@giganews.com...
[]
If you have a GPS timing receiver (different from navigation receiver),
with a PPS output, one edge of that pulse should be accurate to within
50 nanoseconds. A serial output
NTP can deliver a time accuracy of 1nsec?? I my point of view, NTP
includes
methods to estimate the round-trip path delay between the server and
client
but the performance is limited by SO stack latency, it is an Application
Layer protocol.
Marcelo, here's what /my/ NTP achieves:
David,
CONGRATULATIONS!!! Very good tests and presentations!! Very very good!!!
You
gave me real results and all your reports are consistent and show that
it's
impossible to have usec and nsec precision using NTP though Ethernet.
You
have SO stack latency and it's a Layer 7 protocol!!!
One
Steve Kostecke koste...@ntp.org wrote in message
news:slrni0fhv7.86k.koste...@stasis.kostecke.net...
[]
You wouldn't have seen the announcements if the list submission address
was not working.
Tried twice.
And both messages are in the hack...@lists.ntp.org archives:
David Lord sn...@lordynet.org wrote in message
news:852fvpf4p...@mid.individual.net...
[]
Alas bear.zoo.bt.co.uk is no
longer available and BT corporate seem to be getting time
from my servers :-)
David
I hope you can charge them for the privilege!
Could buy a few GPS pucks or radio clocks
Laurent Archambault archi.laur...@gmail.com wrote in message
news:x2w692f4d2f1005112120nb08f2f41m93b97084bdf25...@mail.gmail.com...
Hello all,
After many search, i has not find my answer, whay do it mean the status
XFAC (?).
I has find this Extra Fast Attack Crafts, and i am very happy for
Jaap Winius wrote in message
news:4be85b0e$0$6761$e4fe5...@dreader14.news.xs4all.nl...
[]
Okay, I think this answers my question. I've been running a Garmin GPS
18
LVC for a few years now...
http://www.rjsystems.nl/en/2100-ntpd-garmin-gps-18-lvc-gpsd.php
What this page does not say is
unruh un...@wormhole.physics.ubc.ca wrote in message
news:slrnhuf5b9.168.un...@wormhole.physics.ubc.ca...
[]
You can actually use a modified ntpd to feed any of the ntpd reference
sources to chrony.
If there were a suitably modified NTP available, you wouldn't need chrony
in the first place!
[]
However, what is the recommended minimum number for systems that only
work with local time sources, such as GPS devices and time signal radio
receivers, that each supply their own timing information as well? Is one
always enough, or are there still advantages other than redundancy in
having
Richard B. Gilbert rgilber...@comcast.net wrote in message
news:nzsdnw01doawx3jwnz2dnuvz_tqdn...@giganews.com...
[]
Of course they will not go into the distribution version. At least it
won't go into Dave Mills' distribution.
IF you can make it work across the full spectrum of NTPD usage it
Mr Dave Baxter g8...@uko2.co.uk wrote in message
[]
Indeed, but is GPGGA the correct sentence for NTPD to use? Mine is set
for GPRMC works just fine.
pip pip
Dave B.
It depends on the NTP version, Dave. I believe that newer versions allow
more sentences. Like you, I've used the
Try it!
Previous experience with serial streams has been that it is very hard to
time them much more precisely than the time of a single char, but if
your hardware/firmware/os does support this, then go for it!
Terje
.. and one character is less than 20 microseconds at the advertised 57600
David Woolley wrote in message
news:hql5kh$2m...@news.eternal-september.org...
[]
The FIFO can be turned off (is off by default) on 16550s. The basic
UART algorithm is:
Sample at 16 times baud rate.
On detecting a space, resample in 8 (maybe 7) clocks. If still space,
start assembling
John Hasler wrote in message
news:87zl10gw35.fsf...@thumper.dhh.gt.org...
This might be of some interest to some here:
http://www.cutedigi.com/product_info.php?products_id=4289osCsid=9ae21b081e2ab66b39df0a026ff471a8
I don't know anything about it other than what I have read on the site.
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