[time-nuts] Timing on Ethernet

[Magnus Danielson]

From: "Jack Hudler" <jack at hudler.org>
Subject: Re: [time-nuts] Timing on Ethernet
Date: Sat, 4 Aug 2007 14:01:35 -0500
Message-ID: <00a601c7d6c9$e15604f0$a4020ed0$@org>

> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+magnus=rubidium.dyndns.org at febo.com RETRY
> 
> I was thinking of timing protocol only without any Ethernet on the fiber
> (Trying to think outside the box, which gets in more trouble than you
> know!). I'm not sure why Ethernet was mentioned, maybe they wanted to piggy
> back on the existing net. That scenario sounds like IT bureaucratic
> nightmare that I'd want to stay away from.

Pablo was going that way. You can certainly do it without Ethernet. You need
some form of simple low-rate protocol to transfer measurement data and time.

> If Pablo is going to design their own hardware, perhaps something like
> 1550nm transmission on a high grade single mode fiber that should a nice
> loss budget for the splices on 27km. Then design/adapt a simple timing
> protocol that would support their desires.

1550 nm (i.e. 190 THz) would certainly work.

> Anyway it sounds like a fun project!

Well, guess what I do for a living...

Cheers,
Magnus