Perhaps using a rubidium source instead of GPS ? The actual time can be obtained thru NTP, all you actually need is a precision source to keep time accurate thereafter. 


Rubens
 

On Wed, May 1, 2019 at 4:24 PM Mehmet Akcin <mehmet@akcin.net> wrote:
hey there Nanog,

I am trying to buy a GPS based NTP server like this one 

https://timemachinescorp.com/product/gps-time-server-tm1000a/

but I will be placing this inside a data center, do these need an actual view of a sky to be able to get signal or will they work fine inside a data center building? if you have any other hardware requirements to be able to provide stable time service for hundreds of customers, please let me know.

mehmet