> Le 26 mai 2017 à 11:35, Matthew Huff <[email protected]> a écrit : > > The OXCO oscillator requirement is for hold-over, but we are looking for less > jitter in the system. We could strip down the OS machines and run only NTP > and make other system adjustments that would accomplish much of the same, but > to dedicated a server just for NTP when an appliance is available seems a > waste. > > FINRA has made new timing requirements that are pushing this. Switching to > PTP is ultimately the solution, but the switches in our core data center > don't support it, and would be very costly to migrate to. > You could check out the Spectracom NetClock Model 9489, which although is primarily a GPS stratum one device, also has Ethernet input for stratum 2 operation. It has a TCXO as LO, but with S1 servers upstream should easily keep to the FIRNA constraints that I have been able to dig up. Any unloaded (other than NTP) micro server will get there as well. Mixing NTP with production loads never works.
> > ---- > Matthew Huff | 1 Manhattanville Rd > Director of Operations | Purchase, NY 10577 > OTA Management LLC | Phone: 914-460-4039 > aim: matthewbhuff | Fax: 914-694-5669 > > >> -----Original Message----- >> From: Miroslav Lichvar [mailto:[email protected]] >> Sent: Friday, May 26, 2017 5:29 AM >> To: Matthew Huff <[email protected]> >> Cc: NTP Questions <[email protected]> >> Subject: Re: [ntp:questions] Looking for a NTP stratum 2 appliance >> >> On Thu, May 25, 2017 at 11:31:27AM +0000, Matthew Huff wrote: >>> For the last 20 years I've run our stratum 2 ntp servers under >> Solaris then Linux. I'm looking to replace them with an appliance for a >> number of reasons. One of the main one is clock stability. We have 2 >> microsemi GPS synced stratum 1 servers with rubidium oscillators. I am >> not looking for a linux/bsd/unix box running NTP, but a dedicated non- >> os appliance. >> >> I don't know if such an appliance exists (all I saw that had a real >> NTP client ran a regular OS), but I'm curious what problems is the >> (in)stability of an ordinary computer oscillator causing. Are the >> servers supposed to be able to hold over long periods of time in case >> the stratum-1 servers fail? >> >> -- >> Miroslav Lichvar > _______________________________________________ > questions mailing list > [email protected] > http://lists.ntp.org/listinfo/questions "The power of accurate observation is commonly called cynicism by those who have not got it. » George Bernard Shaw _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
