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.fergu...@gmail.com>
Sender: time-nuts-boun...@febo.com
Date: Mon, 19 Dec 2011 14:00:29
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts@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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