Eric,
As many others have mentioned, Meinberg has an excellent Windows port
of NTPD that replaces the (horrible) default SNTP client. Linux & Mac
should both have the standard NTPD distributions available.
Since you mentioned internet outages (without mentioning frequency or
duration), adding in
Thank you Didier.
Some of us are serious time nuts that means our measurements exceed 24 hours.
When GPS is involved 48 hours is a minimum. Unless you have a Cs fountain
sooner or later you go back to GPS. Between Juerg and me we have at any time 4
PC based computers running. Some tests go
Didier,
This looks very useful. Is there a specific DB9 to USB-C cable that you
would recommend, or would you use a USB-A (female) to USB-C adapter with a
standatrd USB-A to DB9 cable?
On Sat, Oct 19, 2019 at 10:04 PM Didier Juges wrote:
> To be more specific, the app is a serial data logger
Hello Mark. Thanks for that explanation. I GUESS my gobble-fu was working
better than I have credit. I was not sure how closely connected your web
site was to what is posted by texaspyro on EEBlog.
I will continue to use your V6.14 source code, and eagerly await V6.30.
Once I can fork from
I have been quite puzzled about the asymmetric nature of my home Cable
Modem connection to the Internet in regard with the offset discrepancy
I observe. The "last mile" asymmetric nature of Cable Modem (Comcast
in my case) is not very high compared the delta I see between my
stratum-1 servers at
I got in one of these... alas, the GPS module does not seem to work. It never
locks to GPS. Alas, there is no status information to tell what is going on.
These units only output a time code (in one of 4 different formats). All
configuration is done via DIP switches. They do not output any
Hello Time-Nuts,
Well, my trusty Austron 2110 has developed an intermittent that I am
pretty sure is on the uP PCB (throws Illegal SWI3 Occurrence error).
Anyone have a unit that is parts that they would like to get rid of?
If so, please contact me off list.
Yes, there is a uP PCB on eBay, but
You can't test a server for smearieness. It wouldn't surprise me if some
of them turn out to be getting time from google servers or something
similar.
The last time I checked over 50 of the NTP pool stratum 2 servers used
Google, based on the Reference ID. The NTP pool folks are aware of the
CATV plant in inherently asymmetric in delays. Referring to the DOCSIS (data
over cable service interface specification) specs for North America:
Downstream to the customer:
6 MHz channels with 64- or 256-level QAM modulation. If 256-QAM is used, the
raw usable bandwidth is about 38
The interface from the FA2 is USB, so there is no need (and no way) to go
through a DB9. I recommend using an adapter to go from your tablet
(typically micro-USB or USB-C) to a USB-A socket, then use a standard USB-A
male to USB-B male cable going to the FA2.
One issue: once the tablet is
Hi
Once you dig into all the sources of delay, the asymmetry is much more likely
to be
dimensioned in miliseconds than in microseconds. There are a lot of things that
contribute
to the total.
Bob
> On Oct 20, 2019, at 7:31 PM, Hal Murray wrote:
>
>
> f...@cattaneo.us said:
>> Maybe I
f...@cattaneo.us said:
> Maybe I should double check the routing from both ends again and make sure
> they are really symmetric.. I can also ask my coworkers in the networking
> group and hear what they think about it.
We need a cable TV geek.
It wouldn't surprise me if the upstream
themadbea...@gmail.com said:
> In reference to using the NTP Pool, someone mentioned they don't trust them
> and the possibility of a "rogue" server. The NTP Pool has a monitor that is
> constantly querying every server in the pool, if the time drifts too far it
> is removed from the DNS
Replies to several messages collected here to reduce traffic.
artgod...@gmail.com said:
> Off-the-wall thought : could you discipline a well-insulated raspberry pi
> to NTP using heaters or workload to modify its temperature ?
Yes.
https://blog.ntpsec.org/2017/03/21/More_Heat.html
The
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