Anyone know of a solution that doesn't require an external antenna, is NEBS compliant, and has T1-type outputs for me to hook into my Metaswitch gear? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest-IX http://www.midwest-ix.com ----- Original Message ----- From: "Alejandro Acosta" <alejandroacostaalamo@gmail.com> To: nanog@nanog.org Sent: Wednesday, May 1, 2019 5:41:36 PM Subject: Re: NTP question Hello, As other have commented before, it looks you need an outdoor antenna, however, reading the specs it says: "The built in high sensitivity GPS receiver is able to lock multiple satellites from within multiple buildings or from a window location , eliminating the requirement that an outdoor antenna be installed ." Weird. Alejandro, El 1/5/19 a las 15:22, Mehmet Akcin escribió: 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