Regulatory. If we were to lose the GPS signal (antenna failure, etc...) then our stratum 1 time sources wouldn't drift as much and as quickly. For telco and general usage, the cost may not be worthwhile, but when you have auditors looking over your shoulder....
---- Matthew Huff | 1 Manhattanville Rd Director of Operations | Purchase, NY 10577 OTA Management LLC | Phone: 914-460-4039 -----Original Message----- From: Saku Ytti [mailto:s...@ytti.fi] Sent: Sunday, December 30, 2018 12:30 PM To: Matthew Huff <mh...@ox.com> Cc: Shawn L <sha...@up.net>; nanog@nanog.org Subject: Re: CenturyLink Hey Matthew, > We use an older model of > https://www.microsemi.com/product-directory/enterprise-network-time-servers/4117-syncserver-s600 > with rubidium oscillator. Not cheap, but hardened and extremely accurate. Out of interest why rubidium? For short term stability oscillator choice isn't much of a matter for free running even rubidium will be off good +-1us per day or +-30us per week. I've always wondered what niche rubidium covers that isn't handled by much cheaper crystal ovens or actually precise oscillators. -- ++ytti
