It works fine, and is an industry standard. you have to mount the GPS antenna near a window with sky visibility, or on the roof. Many point-to-point microwave radios have GPS built in to obtain accurate timing for transmission multiplexing.
-mel On Aug 8, 2023, at 7:16 AM, Mike Hammett <na...@ics-il.net> wrote: "We use these exclusively in data centers" How well does GPS work inside the datacenter? ----- Mike Hammett Intelligent Computing Solutions<http://www.ics-il.com/> [http://www.ics-il.com/images/fbicon.png]<https://www.facebook.com/ICSIL>[http://www.ics-il.com/images/googleicon.png]<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[http://www.ics-il.com/images/linkedinicon.png]<https://www.linkedin.com/company/intelligent-computing-solutions>[http://www.ics-il.com/images/twittericon.png]<https://twitter.com/ICSIL> Midwest Internet Exchange<http://www.midwest-ix.com/> [http://www.ics-il.com/images/fbicon.png]<https://www.facebook.com/mdwestix>[http://www.ics-il.com/images/linkedinicon.png]<https://www.linkedin.com/company/midwest-internet-exchange>[http://www.ics-il.com/images/twittericon.png]<https://twitter.com/mdwestix> The Brothers WISP<http://www.thebrotherswisp.com/> [http://www.ics-il.com/images/fbicon.png]<https://www.facebook.com/thebrotherswisp>[http://www.ics-il.com/images/youtubeicon.png]<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> ________________________________ From: "Mel Beckman" <m...@beckman.org> To: "Mark Tinka" <mark@tinka.africa> Cc: nanog@nanog.org Sent: Saturday, August 5, 2023 2:26:37 PM Subject: Re: NTP Sync Issue Across Tata (Europe) Mark, You might consider setting up your own GPS-based NTP network. Commercial Ethernet GPS-sourced NTP servers, such as the Time Machines, TM1000A, are as little as $400. Or you can roll your own using a Raspberry Pi or similar nano computer with a GPS module and antenna. We use these exclusively in data centers now rather than depending on Internet NTP servers, primarily for security, because financial transactions in e-commerce can be sensitive to false time information. There are also a variety of NTP-based Internet attacks, so if you can block NTP at your border you’ve eliminated another attack surface. -mel via cell > On Aug 5, 2023, at 11:22 AM, Mark Tinka <mark@tinka.africa> wrote: > > > >> On 8/5/23 20:17, Chris Adams wrote: >> >> It's the NTP pool people you need to talk to - the .freebsd. bit is just >> a vendored entry into the pool (more for load tracking and management). > > Yes, Andreas clarified in unicast. Will do. Thanks. > > Mark.
