If you can't get a good spot for an antenna, you could be on the lookout
for a CDMA NTP clock.
https://endruntechnologies.com/products/ntp-time-servers
We've got one as a backup to our SyncServer S200. Doesn't need an
outdoor antenna as long as you can get a cellular signal in the DC.
EndRun's are Linux based and still getting software updates. As an
added bonus, they also do IPv6.
Of course, you're putting a lot of trust into the wireless companies
doing this, but its a nice alternative.
On 5/1/2019 1:43 PM, Mehmet Akcin wrote:
thank you guys, looks like GPS based NTP is the way to go.
On Wed, May 1, 2019 at 3:36 PM Bryan Fields <[email protected]
<mailto:[email protected]>> wrote:
On 5/1/19 3:22 PM, Mehmet Akcin 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?
You will need a clear view to the sky for at least the antenna.
Most GPS "antennas" are an antenna and Low Noise Amplifier (LNA)
which is
powered via 5-12v on the coax. This sets the noise figure and gain
of the
system, so you can run 50-100' of RG6 coax if needed. You'll need a
F to sma
adapter for this unit it looks like. Don't worry about the impedance
mismatch, 50 to 75 ohm is not horrid, the RG-174 thin cable has more
loss in
10' than 100' of RG6.
You will not want to use the low gain puck antenna, but rather get a
proper
grounded/mounted/weatherproofed antenna such as the ubiquitous 26 dBi
Quadrifilar Helix antenna. https://www.ebay.com/itm/192899151132
--
Bryan Fields
727-409-1194 - Voice
http://bryanfields.net
--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org / http://www.ahbl.org
