RE: CenturyLink

[Matthew Huff <mhuff () ox com>]

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:saku () ytti fi] 
Sent: Sunday, December 30, 2018 12:30 PM
To: Matthew Huff <mhuff () ox com>
Cc: Shawn L <shawnl () 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