Magnus Danielson wrote:
On 17/03/14 09:48, Martin Burnicki wrote:
You'd need hardware (FPGA?) which can be clocked at 1 GHz, and even in
the hardware signal processing you'd need to account for a number of
signal propagation delays which you can eventually ignore at lower clock
rates.
So of cou
Paul wrote:
On Mon, Mar 17, 2014 at 8:50 AM, Joe Gwinn wrote:
Yes. My question is basically a query about the current state of the
art.
Some NTP offsets (output may look funny if formatted) clock1 looking at
clock2 and clock3 (a Raspberry Pi). This suggests it can be as good as
your IRIG
Paul wrote:
On Mon, Mar 17, 2014 at 8:07 PM, Joe Gwinn wrote:
People are also lusting after sub-microsecond sync.
Sure but not optimally in comp.protocols.ntp/questions@lists.ntp.org.
With some help NTP can be quite good but the intent really isn't nanosecond
accuracy.
We have mades some
Joe Gwinn wrote:
I've used IRIG-B004 DCLS before, for cables two meters long within a
cabinet. Worked well. How well do they handle 100 meter cables, in
areas where the concept of "ground" can be elusive?
You could use fiber optics to transfer an IRIG DCLS signal.
However, if you want highe
On Tue, Mar 18, 2014 at 5:14 AM, Martin Burnicki <
martin.burni...@meinberg.de> wrote:
> But without additional measurements you still don't know for sure if this
> is the true time offset, or if there is an additional systematic time
> offset (e.g. to an asymmetric network connection) which can't
On 2014-03-18, Martin Burnicki wrote:
> Magnus Danielson wrote:
>> On 17/03/14 09:48, Martin Burnicki wrote:
>>> You'd need hardware (FPGA?) which can be clocked at 1 GHz, and even in
>>> the hardware signal processing you'd need to account for a number of
>>> signal propagation delays which you c
On 2014-03-18 02:59, Martin Burnicki wrote:
All depends on how accurate and precise you can get your timestamps, and this
is probably easier with network packet timestampers at both sides of a cable
than with a wireless time transfer method like GPS which usually suffers from
delays which can't
On 2014-03-18 02:59, Martin Burnicki wrote:
All depends on how accurate and precise you can get your timestamps, and this
is probably easier with network packet timestampers at both sides of a cable
than with a wireless time transfer method like GPS which usually suffers from
delays which can't
On 18/03/14 01:36, Joe Gwinn wrote:
In article <5327757e.5040...@rubidium.dyndns.org>, Magnus Danielson
wrote:
Joe,
On 16/03/14 23:16, Joe Gwinn wrote:
I recall seeing something from Dr. Mills saying that a formal proof had
been found showing that no packet-exchange protocol (like NTP) could
On 18/03/14 01:24, Joe Gwinn wrote:
In article <532778bf.50...@rubidium.dyndns.org>, Magnus Danielson
wrote:
On 17/03/14 13:50, Joe Gwinn wrote:
In article , William Unruh
wrote:
On 2014-03-16, Joe Gwinn wrote:
I keep seeing claims that Precision Time Protocol (IEEE 1588-2008) can
achiev
On 18/03/14 02:45, Paul wrote:
On Mon, Mar 17, 2014 at 9:33 PM, Joseph Gwinn wrote:
Will it do 100 meters or more, in bad neighborhoods?
I'm not the right person to ask but since it is expected to maintain
between 2.5 and 100 nanosecond sync with CPE nodes (cable modems) I assume
it requir
On 18/03/14 09:59, Martin Burnicki wrote:
Magnus Danielson wrote:
On 17/03/14 09:48, Martin Burnicki wrote:
You'd need hardware (FPGA?) which can be clocked at 1 GHz, and even in
the hardware signal processing you'd need to account for a number of
signal propagation delays which you can eventua
On 18/03/14 10:17, Martin Burnicki wrote:
Paul wrote:
On Mon, Mar 17, 2014 at 8:07 PM, Joe Gwinn wrote:
People are also lusting after sub-microsecond sync.
Sure but not optimally in comp.protocols.ntp/questions@lists.ntp.org.
With some help NTP can be quite good but the intent really isn't
On 18/03/14 10:26, Martin Burnicki wrote:
Joe Gwinn wrote:
I've used IRIG-B004 DCLS before, for cables two meters long within a
cabinet. Worked well. How well do they handle 100 meter cables, in
areas where the concept of "ground" can be elusive?
You could use fiber optics to transfer an IR
Magnus Danielson wrote:> Martin Burnicki wrote:
>> We have mades some tests and found that NTP can yield the
>> same accuracy as NTP if also hardware timestamping of NTP
>> packets is supported on all nodes, similar as for PTP.
>>
>> In fact this isn't surprising, is it?
>
> No, it's not. NTP is
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