Re: [8023-10GEPON] [CHANNEL_LINK] New Excel spreadhseet available ...
Dear Marek,
Thank you for the answers.
I understand some of them, but I still have some questions.
See blow.
By the way, if I do not mention anything, I basically refer to sheet
"T-10GPX30.1570" in
10GEPON-D.0.4_with_examples.xls.
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,
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.
I understand it.
I have to explain the reason why I mentioned S34. I checked sheet
"T-10GPX30.1570" and I thought a target length of PX30 was
20km, so I referred to S34. I understand which cell we refer to is
depending on maximum transmission
distance.
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.
I see. However, I still have a comment.
I think a power budget is ChIL + penalties + Margin.
However, "L6", which represents "Margin", is derived
from Power budget - ChIL - (SRS+SBS), so it does not include the other
penalties .
I think that an equation of "L6" should be
L6=(C8-T4)-L7-L8-L9-L3*P5-V34.
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.
Thank you.
One comment. I think the attenuation is not a
penalty.
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.
I
see.
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.
Umm..... a little complicated.
Is not A value of "V34" used for anything except for making the
chart?
I thought this sheet was used for calculating a power penalty as well as
calculating a ChIL
If you are right, how can we calculate the penalties?
Sincerely yours,
Tsutomu TATSUTA