We use an older model of https://www.microsemi.com/product-directory/enterprise-network-time-servers/... with rubidium oscillator. Not cheap, but hardened and extremely accurate. ---- Matthew Huff | 1 Manhattanville Rd Director of Operations | Purchase, NY 10577 OTA Management LLC | Phone: 914-460-4039 From: Shawn L [mailto:shawnl@up.net] Sent: Sunday, December 30, 2018 9:40 AM To: nanog@nanog.org Cc: Matthew Huff <mhuff@ox.com>; list@satchell.net Subject: Re: CenturyLink Speaking of GPS-enabled NTP appliances, etc. wondering what hardware people are using for this. thanks -----Original Message----- From: "Raymond Burkholder" <ray@oneunified.net<mailto:ray@oneunified.net>> Sent: Saturday, December 29, 2018 12:01pm To: "Matthew Huff" <mhuff@ox.com<mailto:mhuff@ox.com>>, "list@satchell.net<mailto:list@satchell.net>" <list@satchell.net<mailto:list@satchell.net>>, "nanog@nanog.org<mailto:nanog@nanog.org>" <nanog@nanog.org<mailto:nanog@nanog.org>> Subject: Re: CenturyLink On 2018-12-29 7:51 a.m., Matthew Huff wrote:
We have two stratum-1 servers synced with GPS and a PTP feed from a provider that also provides PTP to market data systems, but we still have to monitor drift between system time and NIST time. Don't ask for the logic behind it, it's a regulation, not a technical requirement.
On one occasion, due to bad firmware or a configuration issue, I have seen GPS stratum 1 diverge from NTP. It was somewhat eye brow raising to the company. My NTP monitored servers were shown to be diverging their GPS/NTP, but after looking at twice or thrice, it was the other way around.