nanog mailing list archives
Re: Cost effective time servers
From: Warren Kumari <warren () kumari net>
Date: Thu, 20 Jun 2019 11:30:39 -0400
On Thu, Jun 20, 2019 at 11:00 AM Mel Beckman <mel () beckman org> wrote:
I use the $300 GPS-based TM1000A from TimeMachinesCorp.com. Gets Stratum-1 time from GPS satellites and distributes it. Usually I relay this through a handful of local time servers to spread out the load, but it can handle hundreds of queries per minute, so it’s reasonable to use as a primary source even in moderate-sized data centers. I’ve put in a ton of them, and in most installations I buy two for redundancy. The GPS antenna works from a window in most instances .
I recently fell down the high precision time rabbithole, and now have 3 GPS units (a Truetime, a Symmetricom S250 and a LeoNTP), 3 Cesuim Primary Reference sources (an FTS4060, and 2 PRS-50s), and an assortment rubidium units. One of the "standard" solutions is one of the Microsemi (Symmetricom) SyncServer's, but these can be expensive -- I've been much happies with the LeoNTP ( http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=272 ) -- they are small, they are cheap, and they fast, they are "accurate enough", and they just work. I've got one on my desk, with a cheap (car) GPS antenna dangling out the window, and it syncs and runs happily. A friend of mine has stuffed one in an IP68 box and it's hanging happily on the side of a TV tower in the elements with no issues... I get mine from airspy.us - $349 + antenna. W
-mel beckmanOn Jun 20, 2019, at 7:53 AM, David Bass <davidbass570 () gmail com> wrote: What are folks using these days for smaller organizations, that need to dole out time from an internal source?
-- I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf
Current thread:
- Cost effective time servers David Bass (Jun 21)
- Re: Cost effective time servers Mel Beckman (Jun 21)
- Re: Cost effective time servers Warren Kumari (Jun 21)
- Re: Cost effective time servers Mel Beckman (Jun 21)
- Re: Cost effective time servers Warren Kumari (Jun 21)
- Re: Cost effective time servers Warren Kumari (Jun 21)
- Re: Cost effective time servers Mel Beckman (Jun 21)
- Re: Cost effective time servers Jay Hennigan (Jun 21)
- Re: Cost effective time servers Niels Bakker (Jun 21)
- Re: Cost effective time servers Denys Fedoryshchenko (Jun 21)
- Re: Cost effective time servers Tony Finch (Jun 21)
- Re: Cost effective time servers Tom Beecher (Jun 21)
- Re: Cost effective time servers Niels Bakker (Jun 21)
- Re: Cost effective time servers Andy Ringsmuth (Jun 21)
- Re: Cost effective time servers Quan Zhou (Jun 24)
- Re: Cost effective time servers Joe Abley (Jun 24)