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One thing that comes to mind, though I may be missing something here.
Ethernet is CDMA/CA; would you not loose phase lock during a collision
because of a corrupted carrier?
Early (1970's) Ethernet was CSMA/CD on long
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From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Mon, 06 Aug 2007 15:04:48 +1200
Message-ID: [EMAIL PROTECTED]
Hej Magnus
Hej Bruce,
One could always make use of the 2 spare
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On Sunday 05 August 2007 12:13, Poul-Henning Kamp wrote:
We found the best waveguide experience was in
the range of 300 to 420 MHz, but the distance is very limited,
hundreds of feet at most. The main problem at different
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From: Jack Hudler [EMAIL PROTECTED]
Subject: RE: [time-nuts] Timing on Ethernet
Date: Sat, 4 Aug 2007 20:10:45 -0500
Message-ID: [EMAIL PROTECTED]
Jack,
Well, guess what I do for a living...
Tell me your in the Dallas
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From: Thomas A. Frank [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Sat, 4 Aug 2007 23:54:53 -0400
Message-ID: [EMAIL PROTECTED]
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Hi nuts,
I'm working with Pablo at CERN on the General Machine Timing (GMT)
system, and since this subject has generated quite a lot of questions I
thought I'd give you some more context information:
- CERN is a big (in the
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On Saturday 04 August 2007 23:54, Thomas A. Frank wrote:
Ah, but what if one used the tunnel itself as a waveguide, and
propagated an RF signal down it?
For many years I designed Coal Mining Equipment, I can
tell you from
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In message [EMAIL PROTECTED], Bob Paddock writes:
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We found the best waveguide experience was in
the range of 300 to 420 MHz, but the distance is very limited,
hundreds of feet at most. The
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Hi
I've been thinking (always a bad move), is the idea to use the
ethernet clock to provide precise timing and the data to point to the
waveform cycle. (Shades of gps here). Apparently 10Bt has a strong
component at
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I meant to add - the clock itself is extracted for use in the
interface by a DPLL but I do not know how good it is.
Should be fairly easy to measure.
I will need to make a second independent network, I've already had my
ear
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There are many replies to this thread. I have not read them all,
but I sense some diversion from the truth.
Ethernet is inherently imprecise. Once a message is started, it
runs to completion, taking chunks of time as it goes.
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From: Bill Hawkins [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Sun, 5 Aug 2007 16:25:36 -0500
Message-ID: [EMAIL PROTECTED]
There are many replies to this thread. I have not read them all,
but I sense
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Magnus Danielson wrote:
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From: Bill Hawkins [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Sun, 5 Aug 2007 16:25:36 -0500
Message
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From: Jack Hudler [EMAIL PROTECTED]
Subject: RE: [time-nuts] Timing on Ethernet
Date: Fri, 3 Aug 2007 20:57:12 -0500
Message-ID: [EMAIL PROTECTED]
Thanks Magnus, I guess I was dating myself :).
Jack, no worries! :-)
Pablo
on Ethernet
From: Jack Hudler [EMAIL PROTECTED]
Subject: RE: [time-nuts] Timing on Ethernet
Date: Fri, 3 Aug 2007 20:57:12 -0500
Message-ID: [EMAIL PROTECTED]
Thanks Magnus, I guess I was dating myself :).
Jack, no worries! :-)
Pablo, is this going to be used for timing throughout the entire
!
Jack
-Original Message-
From: Magnus Danielson [mailto:[EMAIL PROTECTED]
Sent: Saturday, August 04, 2007 6:16 AM
To: [EMAIL PROTECTED]
Cc: time-nuts@febo.com
Subject: Re: [time-nuts] Timing on Ethernet
From: Jack Hudler [EMAIL PROTECTED]
Subject: RE: [time-nuts] Timing on Ethernet
measurement
Subject: Re: [time-nuts] Timing on Ethernet
Thinking outside the square
What you need is a low frequency transmitter exactly in the middle of
the ring...
Neville Michie
On 05/08/2007, at 5:01 AM, Jack Hudler wrote:
I was thinking of timing protocol only without any Ethernet
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Neville Michie wrote:
Thinking outside the square
What you need is a low frequency transmitter exactly in the middle of
the ring...
Neville Michie
Neville
Isn't the accelerator located underground?
Bruce
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From: Jack Hudler [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Sat, 4 Aug 2007 14:01:35 -0500
Message-ID: [EMAIL PROTECTED]
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I
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From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Sun, 05 Aug 2007 09:50:19 +1200
Message-ID: [EMAIL PROTECTED]
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Hi,
Low frequencies penetrate the ground to some depth.
However, propagation may vary seasonally as groundwater
concentrations change.
cheers, Neville michie
On 05/08/2007, at 7:50 AM, Dr Bruce Griffiths wrote:
Neville Michie wrote:
Thinking outside the square
What you need is a low
Tell me your in the Dallas area and need help!
-Original Message-
From: Magnus Danielson [mailto:[EMAIL PROTECTED]
Sent: Saturday, August 04, 2007 7:31 PM
To: time-nuts@febo.com; [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Well, guess what I do for a living...
Cheers
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Neville Michie wrote:
Hi,
Low frequencies penetrate the ground to some depth.
However, propagation may vary seasonally as groundwater
concentrations change.
cheers, Neville michie
Neville
Even without the seasonal
Ah, but what if one used the tunnel itself as a waveguide, and
propagated an RF signal down it? Would it then reliably arrive at all
the points, with a known delay?
Since the tunnels are probably at least ten meters wide and tall,
that's a pretty low frequency, which is easy to generate, and
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Thomas A. Frank wrote:
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Ah, but what if one used the tunnel itself as a waveguide, and
propagated an RF signal down it? Would it then reliably arrive
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Dear timing colleges,
At CERN we are considering the possibility of using Ethernet as a real
time field bus.
We may use IEEE 1588 to distribute precise UTC and Ethernet Powerlink or
a similar home made product to guarantee
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Pablo Alvarez Sanchez wrote:
Dear timing colleges,
At CERN we are considering the possibility of using Ethernet as a real
time field bus.
We may use IEEE 1588 to distribute precise UTC and Ethernet Powerlink or
a
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One thing that comes to mind, though I may be missing something here.
Ethernet is CDMA/CA; would you not loose phase lock during a collision
because of a corrupted carrier?
___
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From: Jack Hudler [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet
Date: Fri, 3 Aug 2007 07:38:35 -0500
Message-ID: [EMAIL PROTECTED]
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One
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Looking at the IEEE 1588 while implementing in your own FPGA seems
like an odd choice. It is an option, but you could fairly easy cook
up something which fits your needs. It is not too hard actually.
The main reason that
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First of all thanks a lot for your answers.
For a facility like CERN, I think that normal cabel
assymetries will be sufficiently low such that they would not
require explicit handling, unless you have higher
From: Pablo Alvarez Sanchez [EMAIL PROTECTED]
Subject: Re: [time-nuts] Timing on Ethernet (Magnus Danielson)
Date: Fri, 3 Aug 2007 18:25:58 +0200
Message-ID: [EMAIL PROTECTED]
Hi Pablo,
First of all thanks a lot for your answers.
Thanks.
For a facility like CERN, I think that normal cabel
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On Friday 03 August 2007 07:22, Pablo Alvarez Sanchez wrote:
At CERN we are considering the possibility of using Ethernet as a real
time field bus.
There are a couple of projects that have already gone down this road,
for
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Thanks Magnus, I guess I was dating myself :).
Pablo, is this going to be used for timing throughout the entire CERN site
or just instrumentation on 27km LHC?
If it's just the LHC then what about using an open fiber/copper
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