My thinking is the temperature has the largest effect on change in delay of
the cable and more data points would better to predict this change. The
round trip change in delay would collate with a average of the temperature
along the cable but not necessary as accurate, think cable buried at
different depths under asphalt and grass. It is just noise if we can not
correct for it.
Stanley
----- Original Message -----
From: "Bob Camp" <li...@rtty.us>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Monday, February 04, 2013 4:39 PM
Subject: Re: [time-nuts] Smart fiber-optic cable ( a reference to Hp's
smartclock )
Hi
Consider that cost to manufacture the cable goes up as you put stuff in
it. You not only need sensor packages, you also need to connect them so
they can report data. Unless the sensors are optically powered and linked,
they would compromise the inherent lighting immunity the fiber provides.
It's a *lot* easier to do the same thing with a round trip traverse of the
entire optical link. This is already done by at least one supplier of
these parts. It may be done by several others as well.
Cable delay is not the limiting issue on most short link systems. It's not
clear that data rates would be improved by delay modeling.
Bob
On Feb 4, 2013, at 5:09 PM, Stanley <timen...@n4iqt.com> wrote:
If a fiber-optic cable had temperature sensors either installed with or
embedded inside of this could make for better modeling changes in delay
making more accurate transfer of time and frequency possible. With fiber
to tower installs now under way to provide more data at cell towers why
not backup GPS frequency and time transfer with the same medium ? Would
this also increase the data rate of the cable ? That is faster rates due
to the better timing uncertainty.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
