[time-nuts] Another Trimble Thunderbolt-like GPS?

lists at lazygranch.com lists at lazygranch.com
Mon Dec 19 19:22:43 EST 2011


I was inside a AT$T shack about a month ago. They have GPS timing inside.  I took some photographs, so I will dig up later what timing they use. 

-----Original Message-----
From: Dennis Ferguson <dennis.c.ferguson at gmail.com>
Sender: time-nuts-bounces at febo.com
Date: Mon, 19 Dec 2011 14:00:29 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Another Trimble Thunderbolt-like GPS?


On 19 Dec, 2011, at 11:25 , Rob Kimberley wrote:

> There was a spec issued many years ago to the industry from Lucent I believe
> to come up with a GPS product for base station requirements. 10 MHz, 1PPS,
> OCXO, RS-232 port, and a certain holdover spec.  The Thunderbolt was one,
> Starloc another, NanoSync (from Odetics/Zyfer). There were others.
> 
> Rob Kimberley

I think it was actually Qualcomm.  The requirement for GPS time and 10 microsecond
time synchronization (which informs the holdover spec) came from Qualcomm's CDMA
specification and are unique to it.  GSM, UMTS and (I think) LTE base stations can
get by without GPS at all.

Dennis Ferguson
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