's campus -- but given what I wanted the modem refclock for,
it's OK. Thanks for suggesting that I fiddle with time1 some more.
Rich Wales
ri...@richw.org
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dev/acts0 -s 1200).
As for "the modem connects to my ISP just fine but was really slow" --
remember, I'm not trying to use this TrendNet modem to connect to an
ISP -- I'm only trying to use it to connect to the NIST ACTS.
Rich Wales
ri...@richw.org
matters, I'm using a TrendNet TFM-561U USB modem.
Any ideas why the modem refclock is so far off? Is there anything I can do
about it?
Rich Wales
ri...@richw.org
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e bits should
be fine -- probably use zero (default if no mode is set) for 19200, and
1-6 for the others.
Unless at least one of the known modem time services supports or requires
a very high baud rate, BTW, I'm unconvinced that supporting anything higher
than 9600 is really necessary for t
t;).
I changed B19200 to B1200 in the ACTS driver, and the resulting ntpd was able
to connect and get valid time info from NIST. But I'd prefer a solution, if
at all possible, that doesn't require changing the source code. Any thoughts?
R
e to set flag1 in an ACTS refclock (in order to schedule an
immediate dialup attempt). I know how to do this with ntpdc, but I haven't
been able to find the corresponding command in ntpq.
Rich Wales
ri...@richw.org
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s a lost cause, what current
Linux-compatible modem hardware would people suggest? It would be nice
if a new modem could handle fax (so that I can use it for more than just
occasional time service calls).
Rich Wales
ri...@richw.org
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6.542 2.864
+213.222.200.99 .PPS.1 u 18 64 377 191.1924.890 8.968
==
Any thoughts?
Rich Wales
ri...@richw.org
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f it
could be specified for a peer or server, which currently it cannot.
Again, I'm running version 4.2.6p5 right now.
Rich Wales
ri...@richw.org
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ul if someone could tell me exactly where to
look.
Rich Wales
ri...@richw.org
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able modem infrastructure.
The asymmetry does not appear to be traffic-dependent; I see pretty
much the same offset (between 2 and 3 msec) at any time, day or night.
I'm running NTP version 4.2.6p5@1.2349-o.
Rich Wales
ri...@richw.org
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out "gpsd" and "cgps" should really be directed to the
gpsd-users list (gpsd-us...@lists.berlios.de), so if this answer
isn't sufficient, you should ask again on that list.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/
my firewall (currently a Linux box) and fudge the
NTP packets going between my stratum-1 server and the outside? (Yes,
I agree this could easily end up being a messy kludge, but . . . .)
Rich Wales / ri...@richw.org
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er, but not another peer/server. That's why I wanted to be
able to fudge an association.
Rich Wales / ri...@richw.org
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network latency asymmetries -- the NTP protocol assumes
that traffic "comes" and "goes" with equal speed, and it has no way
to detect situations in which this is not true.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/U
or (non-refclock)
"server" configuration command? If not, can this be considered as
an enhancement? Or am I missing some very good reason why this is a
Really Bad Idea that should (and will) never be implemented?
Rich Wales / ri...@richw.org
e mysterious 8- to 10-msec discrepancy between my GPS clock
and Stanford's campus NTP infrastructure, it turns out that Stanford's
existing TrueTime GPS clock is old and is being phased out. My clock
agrees very closely with a new Meinberg GPS clock which will become
the new campus refclo
epped the problem by arranging for a static
IP address (which my ISP gave me at no extra charge) -- but not
everyone may be able to do this.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:Richwales
Facebook: http://www.facebook.com/richwales
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> Correct; the interleaved modes, both symmetric and broadcast,
> are in the development version now.
OK, thanks for clearing that up.
Am I correct in understanding that interleaved symmetric mode would
be useful if peers are on opposite sides of a cable or DSL modem
infrastructure?
--
eeding to fudge the asymmetry explicitly -- and
that the end result would be good as long as I wasn't expecting to get
super-accurate, sub-microsecond sync (for which I admittedly would
need special network cards with hardware timestamp capabilities).
Am I mistaken here?
--
Rich Wales / ri.
I don't need the separate PPS refclock anyway --
the GPS_NMEA driver deals with the PPS just fine all by itself -- so
I took it out a couple of days ago.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:Richwales
Facebook: http://www
-1 servers were at home
-- sitting next to each other on the same table and plugged into the
same 100baseT switch -- so there shouldn't have been any network
delays to speak of between them -- and they still appeared to differ
by several milliseconds.
--
Rich Wales / ri...@richw.org / ri.
tellites. So I would assume
my GPS unit is working properly -- except for the above evidence that
seems to suggest its time is off.
Any thoughts or suggestions welcomed.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/
4.7.89 3 u 14 16 3769.099 -6.797 8.415
I still seem to be several milliseconds different from the Stanford campus
time source; this is going to require further investigation.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki
0, clock=ce1f0d53.390640e8 Sat, Aug 1 2009 11:52:03.222,
state=4, offset=-1.871, frequency=91.237, jitter=1.968, noise=1.791,
stability=0.000, tai=0
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:Richwales
Facebook: http://www.facebo
1 u 678 1024 377 21.6879.502 0.177
+clock.isc.org .GPS.1 u 688 1024 3774.7062.829 0.131
You might remember I brought up the issue, some time ago, of how the
University of Washington's server (bigben) appears to be way off.
--
Rich Wales / ri...@richw
ror band as wide as the jitter, before comparing the Stanford
> offsets with the PPS.
OK, I'll wait and see what it's looking like in the next day or two.
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:Richwales
Facebook: http:/
,-32.4,M,,*45
$GPRMC,013258,A,3726.2063,N,12210.8019,W,000.0,000.0,010809,015.0,E*6A
$GPGGA,013258,3726.2063,N,12210.8019,W,2,08,0.9,38.0,M,-32.4,M,,*4B
$GPRMC,013259,A,3726.2063,N,12210.8019,W,000.0,000.0,010809,015.0,E*6B
$GPGGA,013259,3726.2063,N,12210.8019,W,2,08,0.9,38.0,M,-32.4,M,,*4A
Any
gt; to 'dev/console'. It is not a good idea to stop the log
> outputs by directing things to '/dec/null'. You might want
> to read some of them.
And just for the benefit of those who might not know enough about
Unixoid systems to catch the typos, those path names sh
owa.edu/dave/ntptemp.php
https://lists.ntp.org/pipermail/hackers/2009-March/004046.html
http://www.ijs.si/time/temp-compensation/
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:Richwales
Facebook: http://www.facebook.c
rt of simply
shunning pools entirely, even as a backup strategy?
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:Richwales
Facebook: http://www.facebook.com/richwales
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Is it possible to use a "TomTom ONE" portable GPS unit as a time
reference with ntpd (without breaking the unit, voiding its warranty,
etc., etc.)?
The unit can connect to a PC via a USB cable, but I have no idea
regarding the capabilities or limitations of its software interface.
--
er, I would need to know where that server is
and which locality's DST rules it is following.
In my view, it makes far more sense for NTP to keep hands off the
whole DST question and confine itself to time-zone-independent
issues (such as UTC, leap seconds, and TAI offset).
--
Rich Wal
I talk to servers
(but it might be a reason for me to encourage my campus timekeepers to
adopt 4.2.6 as soon as it comes out, and have them encourage THEIR peers
to do the same).
--
Rich Wales / ri...@richw.org / ri...@stanford.edu
Wikipedia: http://en.wikipedia.org/wiki/User:R
=171.64.7.89,
reftime=cde250e7.f1698f15 Tue, Jun 16 2009 10:12:07.943, poll=10,
clock=cde251cb.ada3d08e Tue, Jun 16 2009 10:15:55.678, state=4,
offset=3.065, frequency=-18.528, jitter=0.159, noise=2.047,
stability=0.000, tai=0
so it doesn't seem to me that I would be suffering from asymmetric
oes suggest that even servers randomly picked from my own
country's pool (*.us.pool.ntp.org) might not be good choices.
When 4.2.6 comes out, will the "pool" command with the "preempt"
option do a better job of weeding out pool servers that are far
away, and thus possibly o
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