- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power adapter and level?
[]
==
To clarify, now I've done a little reading, I would be expecting to use a
local
On 10/02/2013 9:27 AM, Michael Tharp wrote:
Greetings time-nuts,
I've finally gotten the software for my NTP server project to the
point where I'm comfortable shipping the boards I have now, so it's
about time to spin the next revision. If you could take a minute to
look over the feature
From: Michael Tharp
Greetings time-nuts,
I've finally gotten the software for my NTP server project to the point
where I'm comfortable shipping the boards I have now, so it's about time
to spin the next revision. If you could take a minute to look over the
feature list and let me know on- or
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
Hi Ed,
The voltage swings from 2v to 17v. Doesn't that mean I have about 4 to 5 volt
margin if it's locked at 12 volts?
I had to adjust the capacitor out almost all the way to get it to lock. If I
need to adjust it more can I use the C-field adjustment or should I stay away
from that?
Bob,
That was my thoughts also. The GPS receiver and serial connection to the
computer are working so I know the power connections are ok. I think I bought
this through a group buy from someone on this list and they said all were
tested before they were shipped. Maybe it was just time for the
On 2/10/13 12:40 AM, David J Taylor wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power adapter and level?
[]
==
To clarify, now I've done a little
On Sun, Feb 10, 2013 at 12:40 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power adapter and level?
Yes there is a standard
From: Jim Lux
[]
I would NOT do this.. (use a non standard voltage on the PoE)
too easy to hook the wrong thing up, some day.. Maybe your NTP widget is
up on the roof, and you've got a buddy helping recable with a new switch
that puts 48V on the wire, when your widget is expecting 12...
On 02/10/2013 11:22 AM, Chris Albertson wrote:
Yes there is a standard but there are also may non-standard implementations.
I was a little worried about the comment regarding isolation being
hard to implement. The standard for Ethernet required galvanic
isolation on all Ethernet ports by use
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
On Sun, Feb 10, 2013 at 8:18 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
Point noted, Jim, although the likelihood of me either having a buddy here
or of buying a PoE switch are very remote!
If you are making and selling a product you have to assume others will
do just about
I'm using Meinberg GPS NTP Servers. They are working fine and no problem
with SVs.
Still doing some tests. Will report back once I have anything extra to add.
Thanks.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris
Hi
The OCVCXO tuning voltage adjust on the 10 MHz simply centers up the sweep
process. It has no impact on the output frequency once the unit is locked up.
The C field adjustment sets the Rb on frequency once it is locked. It is only
used to set the unit on frequency.
Since the range on
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.
[]
On 2/10/13 8:22 AM, Chris Albertson wrote:
On Sun, Feb 10, 2013 at 12:40 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power
I think PoE is a great thing, because it allows you to get rid of all those
wallwarts..
More importantly than simply getting rid of them is that with PoE you
can place your Ethernet device in a location where there is no place
to plug-in a wall wart.
--
Chris Albertson
Redondo Beach,
Hi
If you go the DIY route to PoE, be careful of the converter bricks you decide
to use. Switchers by nature put hash on both the input and output terminals.
You want to avoid back feeding crud onto the cable. It's common mode, but the
chokes and transformers only isolate to a limited degree.
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
Hi Garren,
Yes, you're right. Silly me, I made the mistake of believing what was
written in the manual which says 2-12 volts. When I measure it, I see
~2-16 volts. Let that be a warning to you. This isn't the first time
that manual has led me astray! I should have known better.
Did you
-BEGIN PGP SIGNED MESSAGE-
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
Full-blown 802.3af POE (IEEE 802.3af-2003 for example) is not a simple beast.
The Arduino world uses a standard module, the Silvertel Ag9000-S.
Silvertel shows them as $10.64 each for a module that puts out 9W max and is
802.3af compliant.
Bob K6RTM
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
I have a TrueTime XL-DC that has an IRIG B plug-in that uses that same
Tri-Lobe BNC connector. I'm planing on changing these out to normal
BNC connectors due to the rarity and expense of trying to use them
as-is!
Steve
___
time-nuts mailing
Boy I almost remember what the XL was.
They also make insulated shield bncs or as easily an audio xlr if you need
balanced.
Regards
Paul
On Sun, Feb 10, 2013 at 7:59 PM, st...@pacair.com wrote:
I have a TrueTime XL-DC that has an IRIG B plug-in that uses that same
Tri-Lobe BNC connector. I'm
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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