Guys,
It may be useful to compare the equation variables with the
tables of
variables. You should not see capepsilon anywhere. I
continue to believe
this is the wrong XML document.
Dave
Greg Dowd wrote:
> That's peer dispersion epsilon, as opposed to root
dispersion
> capepsilon. The text in the graphic shows the correct
epsilon.
>
>
> Greg Dowd
> gdowd at symmetricom dot com (antispam format)
> Symmetricom, Inc.
> www.symmetricom.com
> "The current implementation is non-obvious and may
need to be improved."
>
>
>
>
>
>
> ________________________________
>
> From: Odonoghue, Karen F CIV NSWCDD, W13
> [mailto:karen.odonoghue navy.mil]
> Sent: Wednesday, April 04, 2007 2:56 PM
> To: Greg Dowd; Plunkett, Timothy R CIV NSWCDD, W13;
> ntpwglists.ntp.isc.org
> Subject: RE: [ntpwg] questions about current NTP
protocol draft
>
>
> I asked Tim to check the reformatted xml to make sure
nothing got
> corrupted in the process.
> The equation in question is:
>
> Karen
>
> In the next step the shift register stages are copied
to a temporary
> list and the list sorted by increasing delta. Let i
index the stages
> starting with the lowest delta. If the first tuple
epoch t_0 is not
> later than the last valid sample epoch p.t, the routine
exits without
> affecting the current peer variables. Otherwise, let
epsilon_i be
> the dispersion of the ith entry, then
> i=n-1
> --- epsilon_i
> capepsilon = ----------
> / (i+1)
> --- 2
> i=0
>
> is the peer dispersion p.disp. Note the overload of
epsilon, whether
> input to the clock filter or output, the meaning should
be clear from
> context.
>
>
> ________________________________
>
> From: ntpwg-bounces+karen.odonoghue=navy.millists.ntp.isc.org on behalf
> of Greg Dowd
> Sent: Wed 4/4/2007 4:22 PM
> To: Plunkett, Timothy R CIV NSWCDD, W13; ntpwglists.ntp.isc.org
> Subject: Re: [ntpwg] questions about current NTP
protocol draft
>
>
> I'm honestly not EXACTLY sure what version is what in
the xml domain but
> I'll vote.
>
> 1) I don't see capepsilon in the non xml version. Can
you quote the
> string or equation here? In any case, capepsilon is
root dispersion.
> If the notes or context allows you to determine that
the variable in
> question is indeed root dispersion then EPSILON would
be correct in the
> latest version.
>
> 2) Yes, sqrt of the sum of the squares.
>
>
>
> Greg Dowd
> gdowd at symmetricom dot com (antispam format)
> Symmetricom, Inc.
> www.symmetricom.com
> "The current implementation is non-obvious and may
need to be improved."
>
>
>
>
>
>
>
> ________________________________
>
> From: ntpwg-bounces+gdowd=symmetricom.comlists.ntp.isc.org
> [mailto:ntpwg-bounces+gdowd=symmetricom.comlists.ntp.isc.org] On Behalf
> Of Plunkett, Timothy R CIV NSWCDD, W13
> Sent: Wednesday, April 04, 2007 2:02 PM
> To: ntpwglists.ntp.isc.org
> Subject: [ntpwg] questions about current NTP protocol
draft
>
>
>
> I am currently editing the XML version of the latest
NTPv4 protocol
> draft. I noticed the following two things that I was
hoping that
> someone could clarify for me.
>
> 1. Should the equation for capepsilon in section 10 be
for a variable
> called EPSILON instead? I know that there has been an
effort to remove
> all the "cap" variables and I think this is a
leftover.
>
> 2. Should the equation for PSI in section 11.2.3 have a
square root
> function in it? Seems like PSI should equal SQRT
[(PSI_s)^2 +
> (PSI_p)^2]. If preferred I could also raise it to the
one half power as
> well.
>
> Thanks,
>
> Tim
>
>
***********************************************************
> Timothy R. Plunkett
> NSWC-DD, Code W13
> Building 1500 Room A122A
> 17214 AVENUE B SUITE 100
> DAHLGREN, VA 22448-5147
>
> (540) 653 - 1090 (phone at Dahlgren)
> (540) 653 - 8673 (fax at Dahlgren)
>
>
>
>
>
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