bruns at 2mbit.com
Wed May 1 20:01:44 UTC 2019
If you can't get a good spot for an antenna, you could be on the lookout
for a CDMA NTP clock.
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 <Bryan at bryanfields.net
> <mailto:Bryan at bryanfields.net>> 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
> > 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
> 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
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