Quoting Julien Goodwin :
Show my anything short of a classic SONET transmission system (or
perhaps sync-E) where you actually have something with jitter that
low [tens of microseconds].
Since you asked, here you go: http://i.imgur.com/DvMJd5y.png
Two EndRun Unison GPS NTP servers, one in New
> So what, that sends IP packets, are you using to *measure* it. I can
Agilent if we need unidir. Normal run-of-the-mill 10GE SP router will give you
low single digit microsecond jitter when not congested. (You can run 99.99% no
problem, as long as you don't try >100% (i.e. >1 interface sending))
On 04/04/14 21:48, Saku Ytti wrote:
> On (2014-04-04 20:37 +1100), Julien Goodwin wrote:
>
>>> Meinberg[0] pegs rubidium at ±8ms per year, if you need NTP to do say single
>>> direction backbone SLA measurement you want to have microsecond precision.
>>
>> Those two statements don't go together.
>
On (2014-04-04 20:37 +1100), Julien Goodwin wrote:
> > Meinberg[0] pegs rubidium at ±8ms per year, if you need NTP to do say single
> > direction backbone SLA measurement you want to have microsecond precision.
>
> Those two statements don't go together.
Point I was making is that free-running r
On Thu, 3 Apr 2014, David Hubbard wrote:
Anyone have recommendations on NTP appliances; i.e. make, model, gps vs
cell, etc.? Roof/outdoor/window access not available. Would ideally
need to be able to handle bursts of up to a few thousand simultaneous
queries. Needs IPv6 support.
For some di
On 04/04/14 10:16, Majdi S. Abbas wrote:
> On Thu, Apr 03, 2014 at 06:55:02PM -0400, David Hubbard wrote:
>> Anyone have recommendations on NTP appliances; i.e. make, model, gps vs
>> cell, etc.? Roof/outdoor/window access not available. Would ideally
>> need to be able to handle bursts of up to
On 04/04/14 17:29, Saku Ytti wrote:
> On (2014-04-03 21:25 -0700), Will Orton wrote:
>
>> There are commercially available NTP servers with GPS + Rb oscillators...
>> for NTP
>> use you could basically let it sync up a couple days, disconnect the GPS and
>> let
>> it freerun. You'd still be wi
On (2014-04-03 21:25 -0700), Will Orton wrote:
> There are commercially available NTP servers with GPS + Rb oscillators... for
> NTP
> use you could basically let it sync up a couple days, disconnect the GPS and
> let
> it freerun. You'd still be within a millisecond of GPS even after a couple
On Thu, Apr 03, 2014 at 09:06:57PM -0700, George Herbert wrote:
> Sadly, right now that either means your own real clock, or WWV. The
> cellphone time is (as far as I know, for the networks I saw data on) all
> coming off GPS.
>
> Fortunately real clocks are coming way down in cost.
There are c
Loves my old Heathkit WWVB unit. Keeps drift in check most days.
Pairs nicely with the Spectracom 9383.
Looking at the Microsemi TP-5000 w/ rubidium oscillator.
/bill
On Thu, Apr 03, 2014 at 10:25:07PM -0400, Rob Seastrom wrote:
>
> On a tangential note, it's all very nice to say "We h
On Thu, Apr 3, 2014 at 8:46 PM, Rob Seastrom wrote:
>
> Chris Adams writes:
>
> > Once upon a time, Rob Seastrom said:
> >> Along the same lines I'm troubled by the lack of divergent sources
> >> these days - everything seems slaved to GPS either directly or
> >> indirectly (might be nice to ha
Chris Adams writes:
> Once upon a time, Rob Seastrom said:
>> Along the same lines I'm troubled by the lack of divergent sources
>> these days - everything seems slaved to GPS either directly or
>> indirectly (might be nice to have stuff out there that got its time
>> exclusively via Galileo or
Once upon a time, Rob Seastrom said:
> Along the same lines I'm troubled by the lack of divergent sources
> these days - everything seems slaved to GPS either directly or
> indirectly (might be nice to have stuff out there that got its time
> exclusively via Galileo or Glonass).
Since you mention
On a tangential note, it's all very nice to say "We have brand X and
like them", but I'd be curious to hear from folks who have deployed at
least four divergent brands with non-overlapping GPS chip sets and
software [*] to keep a conspiracy of errors from causing the time to
suddenly be massively
We have symmetricom (now microsemi) and are very happy with them, but we use
the roof mounted gps antennas. They will peer with public ntp severs if that
would work for you.
David Hubbard wrote:
>Anyone have recommendations on NTP appliances; i.e. make, model, gps vs
>cell, etc.? Roof/outdoo
On Thu, Apr 03, 2014 at 06:55:02PM -0400, David Hubbard wrote:
> Anyone have recommendations on NTP appliances; i.e. make, model, gps vs
> cell, etc.? Roof/outdoor/window access not available. Would ideally
> need to be able to handle bursts of up to a few thousand simultaneous
> queries. Needs
16 matches
Mail list logo
