Dear Tatsuta-san and all,
I
cleared the two last emails and will comment in line again, this time in red.
Marek
Hajduczenia (141238)
NOKIA SIEMENS Networks S.A.,
Portugal - R
Rua
Irmãos Siemens, 1
Ed. 1, Piso 1
Alfragide
2720-093
Amadora
Portugal
*
Marek.Hajduczenia@siemens.com
http://www.marekhajduczenia.info/index.php
(+351.21.416.7472 4+351.21.424.2082
From: TATSUTA [mailto:tatsuta@ANSL.NTT.CO.JP]
Sent:
quarta-feira, 2 de Maio de 2007 6:49
To:
STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON]
[CHANNEL_LINK] New Excel spreadhseet available ...
Dear
Marek,
This is Tsutomu TATSUTA from NTT.
Thank you for your great
work. I think 10GEPON-D[1].0.7h is very useful to understand this complicated
work.
[Marek Hajduczenia] You're more
than welcome. It is great to know it is useful for someone :-)
By the way, I have some comments and questions.
[Marek Hajduczenia] Sorry for a delayed answer
but I had to analyze the issues in detail to make sure that I do not provide
false answers. First of all, I made the attached file in order
to understand relation between a power budget and the spreadsheet. Basically I
referred a white paper whose title was "Review of the 10Gigabit Ethernet Link
Model" (I think this paper was sent from you).
[Marek Hajduczenia] Correct. I believe it would be easier
to compare one of the stable versions of the spreadhseet prior to modifications
e.g. 10GEPBud3_1_16a.xls or similar documents created for the
EFM
In my slide, I have some questions.
1. Is "Pc" a value of
cell "S34"?
[Marek
Hajduczenia] Cell S34 is empty in the quoted vecrion of the spreadsheet. Do You
refer to some other version of the spreadhseet?
[Marek Hajduczenia] If I am
not mistaken, cell S34 in 10GEPON-D.0.4_with_examples.xls which You referred to
is the value of PCross_Central, - the Pc, which is defined as the correction
factor due to penalty interactions, is indeed represented by this particular
column rather than a single cell. At the maximum transmission distance of
n km, You could say that Your Pc is defined by S34.
2. Which cell is representing item
"M"?
[Marek Hajduczenia] in current
version http://www.ieee802.org/3/av/public/tools/10GEPON-D.0.7h.xls of the spreadhseet has cell B45
which represents the Budget_margin
[Marek Hajduczenia] This one I believe was answered.
In 10GEPON-D.0.4_with_examples.xls which You
referred to, which value was represented in cell L6, though in the end we
decided to do a more detailed budget overview and organize the spreadhseet, thus
version D.0.7 was born, along with all the subversions.
3. "LP Pen central" (cell "V34") looks
like representing all of penalties. Is my understanding right?
[Marek Hajduczenia] See comment to
point 1.
[Marek
Hajduczenia] It would seem so - though beware that the value does not
include the attenuation as well as any non-linear penalties which are calculated
in a separate spreadhseet and inserted into this one.
4. "LP Pen central" is including
cell "L34" which is "P_DJ central". The white paper does not notify it. If
question no.3 is yes, do we need to include "P_DJ central" in "LP Pen
central"?
[Marek
Hajduczenia] See comment to point 1.
[Marek Hajduczenia] I believe so - I think that this
particular question would be better answer by the original authors of the
spreadhseet - some of the relations between the individual variables were
modified with time and are not often reflected in the quoted white paper.
A following comment relates to your
file.
5. Cell "B42" in file "10GEPON-D[1].0.7" is specified as
other_penalties which represents other system penalties. However a value is
derived from cell "L7" in file "10GEPON-D[1].0.4_with_examples", which
represents Connections etc. I think this value should be included in ChIL and a
penalty should come from cell "V34".
[Marek Hajduczenia] In http://www.ieee802.org/3/av/public/tools/10GEPON-D.0.7h.xls, the cell other_penalties (B42) is
a total of the non-linear penalties (B21) and fibre plant penatlies (B22), whic
includes splices, connectors etc. Cell B41 (fibre_loss) includes pure fibre loss
only, assuming there are no connectors, PSC etc. and the channel is ideal.
[Marek Hajduczenia] As far as I understand the
question, what You're saying Tatsuta-san is that we should take the
splices, connectors etc. and include them in the CHIL and take the system
penalties as the maximum value calculated in cell V34. Please note however that
the said system penalty value You refer that is column V is not used in any
calculations apart from charting ... It is hard for me to say whether we should
therefore use this value or not. Please forgive me
if my understanding is irrelevant.
[Marek Hajduczenia] I appreciate the input but I am afraid You will have
to clarify questions 1,3 and 4 using either the current version of the
spreadsheet (http://www.ieee802.org/3/av/public/tools/10GEPON-D.0.7h.xls)
or providing me with the correct version of the spreadhseet that You used when
writing this email. Sorry I cannot be more helpful at the moment.
Sincerely yours,
Tsutomu TATSUTA
At 01:02 07/03/30,
Hajduczenia, Marek wrote: