As a FYI, the 6 port card I use is based on the4 Netmos NM9845CV. There
are a few vendors peddling serial cards using this chipset and part
number. Mine is from "Best Connectivity" (SD-PIO9845-6S). The card is
windows and linux capable.
___
time-nuts
Hi
Ok, at least now we are down to some numbers. Ever taken a look at NTP on a
Windows box running serial? It's not anywhere near a microsecond….
Bob
On May 23, 2012, at 6:47 PM, Chris Albertson wrote:
> On Wed, May 23, 2012 at 2:59 PM, Bob Camp wrote:
>> Hi
>>
>> Ok, to be 1000: 1, you wou
On Wed, May 23, 2012 at 2:59 PM, Bob Camp wrote:
> Hi
>
> Ok, to be 1000: 1, you would take the 0.2 to 0.5 ms that you see on the LAN
> and take it up to 200 to 500ms. That's *way* worse than anything I have ever
> seen for a serial server over a LAN.
Yes, 200 ms would be insanely poor. NTP wi
Hi
Ok, to be 1000: 1, you would take the 0.2 to 0.5 ms that you see on the LAN and
take it up to 200 to 500ms. That's *way* worse than anything I have ever seen
for a serial server over a LAN.
Bob
On May 23, 2012, at 5:15 PM, Chris Albertson wrote:
> On Wed, May 23, 2012 at 2:02 PM, Bob Camp
On Wed, May 23, 2012 at 2:02 PM, Bob Camp wrote:
> Hi
>
> What ever degradation the serial stream sees on the LAN, the resulting NTP
> output will see once it's on the same LAN. It's unlikely you will see more
> than a 2:1 net degradation no matter what is going on. The flywheel in the
> NTP algor
Hi
What ever degradation the serial stream sees on the LAN, the resulting NTP
output will see once it's on the same LAN. It's unlikely you will see more
than a 2:1 net degradation no matter what is going on. The flywheel in the
NTP algorithm will likely help you in this case to actually improve th
Hi
They have been sitting in the shed for 15 years now. They were knock off's
when I bought them.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of DaveH
Sent: Wednesday, May 23, 2012 2:46 PM
To: 'Discussion of precise time and freq
On Wed, May 23, 2012 at 12:13 PM, Chris Albertson
wrote:
> On Wed, May 23, 2012 at 9:08 AM, Bob Camp wrote:
>> Hi
>>
>> If the timing involved is NTP, I'm not so sure that a normal home lan with
>> gigabit switches would be a problem.
One thing I forgot to add. Gigabit switches are WORSE for NT
On Wed, May 23, 2012 at 9:08 AM, Bob Camp wrote:
> Hi
>
> If the timing involved is NTP, I'm not so sure that a normal home lan with
> gigabit switches would be a problem. You can indeed saturate the poor thing.
> Unless you have a very unusual system, it is unlikely you will saturate it
> for ver
Hi Bob
Actually, I checked the website before posting and Digi has drivers for
Windows Vista and 2008 ( as well as XP, 2K and 98)-- I will see if it works
on Win7 before posting what I have.
What cards do you have?
Dave
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:
Hi Henry:
You might just try using a spreadsheet to calculate the complex impedance of your model circuit and manually play with
the parameter values and get them to match the measured data.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Clarke4Congress.html
Hi time-nuts!
If I remember correctly here was a discussion about an older HP
impedance measurement equipment. The one which is able to calculate a 6
ideal parts replacement circuit for the measured passive device.
How does is it works? I would like to fit parts for simulation in SPICE.
So I
On 5/20/2012 7:56 PM, Mark Sims wrote:
An interesting test would be to test a Nortel unit and a Tbolt with the same
oscillator and see if the basic hardware had any difference in performance (I
bet they would be very close)
I had my Nortel running on the bench, in the open, for about 48 Hours,
Hi
If the timing involved is NTP, I'm not so sure that a normal home lan with
gigabit switches would be a problem. You can indeed saturate the poor thing.
Unless you have a very unusual system, it is unlikely you will saturate it
for very long or saturate it very often. NTP is pretty tolerant of t
On Wed, 23 May 2012 01:54:20 -0700
Hal Murray wrote:
> > There aren't noticable more jitter for moderate (1-2 MByte/s) traffic.
> > (Probably visible if i would do a statistical analysis...but..)
>
> 1-2 megabytes/sec is 8-16 megabits/sec. You won't get into serious troubles
> until you satur
Hi Tom,
Thanks for replying to my request with some info. I went ahead and set the mode
to AUTO. After your comment, I read the manual again and it says that the unit
will transition to STATIONARY once it detects that the position has not changed
for a while.
As for the Windows control softw
I've had really good luck with anything based on the FTDI chip set.
Other chip sets have
given me problems...
Dan
On 5/22/2012 6:37 PM, time-nuts-requ...@febo.com wrote:
I have yet to be happy with any USB to serial conversion in legacy
applications. They always end up less than transparent
Hi
I have a few of those from back in the BBS days. None of them seem to have
drivers any more.
Bob
On May 23, 2012, at 12:52 AM, DaveH wrote:
> I used to run a multi-line BBS (Wildcat!) and may still have two multi-port
> serial interfaces. I know that one has eight com ports and the other c
att...@kinali.ch said:
> On an ethernet it looks quite different:
[snip lots of low jitter samples]
> Network is a destkop - switch1 - switch2 - ntp box.
> The switches are two Level1 Gbit smart switches. The desktop is a ~4y old
> Xeon 2GHz system with a Gbit interface The ntp box is a AMD Geo
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