NTP question

Mike Hammett nanog at ics-il.net
Thu May 2 15:56:26 UTC 2019

What sort of products are people using to provide timing services to third parties in datacenters? 

Mike Hammett 
Intelligent Computing Solutions 


----- Original Message -----

From: "James Harrison" <james at talkunafraid.co.uk> 
To: nanog at nanog.org 
Sent: Wednesday, May 1, 2019 5:27:38 PM 
Subject: Re: NTP question 

On 01/05/2019 20:29, Job Snijders wrote: 
> The trick is to order a spot on the roof of the datacenter, have the 
> facility staff place the antenna there, and run a cable to the NTP 
> server in your rack. 

Some DCs also offer GPS antenna feeds fed from a splitter, though it's 
important to get the total cable length from the antenna to your 
receiver so you can set your propagation delay offset accordingly. I've 
also been in facilities that distribute IRIG and 10MHz references so you 
can feed a reference directly, but that's fairly rare. 

It's worth asking what your facilities can provide, in either case. Many 
DCs don't want a dozen GPS antennae cluttering the roof up but are happy 
to provide the service from one they look after (for a cost, of course). 

If you have external facilities, of course, so long as you can run 
PTP/1588 back from them, you can always host your clocks there and 
distribute to 1588 masters in the DC. 
James Harrison 

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