On 02/12/2013 08:19 PM, Mike S wrote:
On 2/10/2013 6:04 PM, Magnus Danielson wrote:
You should read TCP/IP as Internet Protocols (notice plural form
here). It points to the stack of protocols,
Actually, no. IP is Internet Protocol, singular, and is the L3 (mostly -
IP predates the ISO/OSI
On Wed, Feb 27, 2013 at 7:02 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 02/12/2013 08:19 PM, Mike S wrote:
On 2/10/2013 6:04 PM, Magnus Danielson wrote:
You should read TCP/IP as Internet Protocols (notice plural form
No. The best way to pronouncethe slanted bar is over.
So
:31
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Possibly off topic - Jitter on
Ethernet over poweradapters
On Wed, Feb 27, 2013 at 7:02 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 02/12/2013 08:19 PM, Mike S wrote:
On 2/10/2013 6:04
On Wed, Feb 27, 2013 at 9:54 PM, DaveH i...@blackmountainforge.com wrote:
IP can be run on a lot of different platforms.
Check out Request for Comments: 1149
Even better, check out the guys who actually implemented RFC1149.
This page has links.
http://www.blug.linux.no/rfc1149/
Chris
On 2/10/2013 6:04 PM, Magnus Danielson wrote:
You should read TCP/IP as Internet Protocols (notice plural form
here). It points to the stack of protocols,
Actually, no. IP is Internet Protocol, singular, and is the L3 (mostly -
IP predates the ISO/OSI model layers, so IP suite protocols don't
Thanks for the details, Mike.
I read TCP/IP as TCP over IP, because TCP can be used with any
data link layer that doesn't guarantee delivery.
OTOH, the first book I read about the Internet protocols was titled
TCP/IP so there is a tendency to lump then together. I've read that
the developers of
Ahem!
Ethernet over powerline!
NOT PoE!
The various forms of ether over power are (for practical purposes) a
wireless ethernet protocol coupled into the AC wiring.
And yes, it is noisy timing wise, for all the same reason that a
simplex/shared variable rate 802.11 system is.
On 2/10/13
On 2/11/2013 10:35 AM, time-nuts-requ...@febo.com wrote:
It is unlikely to add much noise. The PoE device only puts a DC bias
on the twisted pair. The data signal is differential. It is
transformer couple to is pretty much is immune to common mode noise.
So even iif the DC bias was noisy I
I use a number of power line switches in my home environment. Primarily
Insteon devices which are similar, but much improved version of the X-10
products.
For powerline communications, the data bursts are timed with the
zero-crossing point of the power line signal. This implies that some
I'm not sure if this is the best place to ask the question, but does anyone
have experience of using Ethernet over power line adapters? I have an
outside office, and my router is in the house plugged into the phone master
socket. I have used two Ethernet over power adapters, one at the router and
From: Rob Kimberley
[]
I'm not sure if this is the best place to ask the question, but does anyone
have experience of using Ethernet over power line adapters? I have an
outside office, and my router is in the house plugged into the phone master
socket. I have used two Ethernet over power
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David J Taylor
Sent: 10 February 2013 11:39
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Possibly off topic - Jitter on Ethernet over
poweradapters
THose power over Ethernet devices work with analog signals and don't
evn look at the data packets. All they do is place a DC bias on the
twisted pair.Ethernet is always transformer coupled so your
routers, switches and computers never see DC.
What is your NTP server using for a reference
Albertson
Sent: 10 February 2013 16:15
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Possibly off topic - Jitter on Ethernet over power
adapters
THose power over Ethernet devices work with analog signals and don't
evn look at the data packets. All they do is place a DC
From: Chris Albertson
[]
THose power over Ethernet devices work with analog signals and don't
evn look at the data packets. All they do is place a DC bias on the
twisted pair.Ethernet is always transformer coupled so your
routers, switches and computers never see DC.
[]
The poster is asking about ethernet over power line and not power over
ethernet. As you point out, the later should have zero effect on
ethernet latency.
There are several ethernet over power standards. Latency will include
a bridge in each adapter, the effects of a noisy uncontrolled AC power
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Hash: SHA1
My gut feeling would be that overall noise/power/length of run etc is
going to be a significant factor, too - ie, longer runs or noisier
power environments will have an impact.
As with all things sensitive, it's best to isolate things - I have yet
to
Rob,
One of the common characteristics of power lines is noise.
Seems to me that bursts of noise could interrupt the Ethernet signal,
causing retries of the transmission.
Now, I'm only familiar with SNTP, which uses UDP messages (User Datagram
Protocol). The more familiar TCP will retry
Hi Bill,
On 02/10/2013 07:44 PM, Bill Hawkins wrote:
P.S. The Meinberg article at their site says that NTP and SNTP both use
TCP/IP. I know that SNTP uses UDP/IP, so perhaps they are confused. TCP
(Transmission Control Protocol) requires a request/confirm / indication/
/response handshake using
On Sun, 10 Feb 2013 12:44:57 -0600, Bill Hawkins b...@iaxs.net
wrote:
Rob,
One of the common characteristics of power lines is noise.
Seems to me that bursts of noise could interrupt the Ethernet signal,
causing retries of the transmission.
Now, I'm only familiar with SNTP, which uses UDP
On Sun, Feb 10, 2013 at 3:49 PM, David davidwh...@gmail.com wrote:
On Sun, 10 Feb 2013 12:44:57 -0600, Bill Hawkins b...@iaxs.net
wrote:
Rob,
One of the common characteristics of power lines is noise.
Seems to me that bursts of noise could interrupt the Ethernet signal,
causing retries of the
It is unlikely to add much noise. The PoE device only puts a DC bias
on the twisted pair. The data signal is differential. It is
transformer couple to is pretty much is immune to common mode noise.
So even iif the DC bias was noisy I don't thing it would matter.
Chris Albertson
Redondo
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