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Dear Saeki-san,
Thank You for Your email. I took some time to answer it, mainly due to the excessive work load.
Regarding my comments: I reviewed Your slide and the formula seems basic enough to be included in the spreadsheet right away. I do not see any limitations. How do You plan to provide the chirp parameter C? Do You provision it to be estimated automatically (if so, what is the formula You need to use)) or be introduced by hand (if so, how do we assure that a user does not put something unreasonable ?).
Regarding Your second question - the spreadsheet is relevant to the standard in one simple way. Whatever numbers we decide to put in the standard tables, at the end of the day when placed in the spreadhseet, they should ideally indicate that the system is feasible and that the received eye patter will not be closed. Please note here that the spreadsheet operates on the worst case scenario assumptions, which means that we are more likely to observe better system performance in reality. All in all, I believe that the parameters relevant for us are the values we input i.e. Tx output power and Rx sensitivity, channel loss figures, acceptable limit for the transmission penalties and TDP.
As far as TDP value is concerned, please note that the TDP modelling is very pessimistic (please see the attached white paper) and it is very hard to say how close it could be to a real system some companies can build. I would say that again empiric verification will be needed.
Hope that clarifies Your doubts.
Best wishes
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
-----Original Message-----
From: NAOTO SAEKI [mailto:n-saeki@bl.jp.nec.com]
Sent: segunda-feira, 21 de Maio de 2007 19:02
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [CHANNEL_LINK] New Excel spreadhseet available ...
Dear Marek,
This is Naoto Saeki of NEC.
Thank you for your great work to update the spread sheet for 10GE-PON.
I am trying to understand this complicated spread sheet and add
dispersion penalty by LD charp.
Please find attached pdf file and comment me.
I have a basic question for relevancy between spread sheet and standard
document.
Frankly say, is it needed to define a specification value in standard ?
or just tool for help to understand and estimate optical link model?
I would like to know which parameter should be defined by the spread sheet.
I can only find the value of TDP that may have relevancy to the spread
sheet. If so, how can we estimate TDP for 10GE-PON.
In my understanding, TDP for 802.3ah was defined with experimental
validation.
How accurate the value of TDP in the spread sheet?
I hope you will advice me on this topics.
Best Regards,
Naoto Saeki
Hajduczenia, Marek wrote:
> Dear all,
> it is my pleaseure to inform You that a new version of the channel link
> model is available at: http://www.ieee802.org/3/av/public/tools/index.html
> The list of introduced changes (non-exhaustive) includes the following
> items:
>
> * Modified user interface - all typical user input was grouped in a
> single table
> * The spreadsheet is locked by default (no password) providing
> access only to user input fields
> * All tables with less frequently observed/modified parameters were
> moved to row 500
> * Modified fibre attenuation curve selector - right now it is
> possible to use the previously existing model ("standard" in cell
> B24) or G652 AB/CD type of curves
> * Added G652AB/CD fibre attenuation curves with min/max values to
> observe changes on the power budget in the function of fibre
> attenuation (set B24 to G652AB or G652CD and modify cell B25 to
> get min/max curves)
> * Added curve type selector for PSC attenuation curve (cell B18)
> with 3 possible values i.e. min/max/average, as discussed in
> 3av_0611_hajduczenia_1.pdf
> <http://www.ieee802.org/3/av/public/2006_11/3av_0611_hajduczenia_1.pdf>
>
> * Set-up the print area so that there is a table with parameters
> along with the charts
> * Added uniform colour coding to indicate
> correct/incorrect/input/output cells
> * Added Macro to allow the user to input Extinction Ratio and vary
> either Tx_Pave_dBm or TxPave_OMA (cells B4 or B5) - please allow
> macros in this document if You want to use this particular
> functionality
> * Added 4 columns for upper and lower limits used in conditional
> formating in User input and Calculated Parameters tables.
>
> I would appreciate all constructive comments on this issue.
> Thank You and best wishes
> **
> *Marek Hajduczenia (141238)**
> **SIEMENS Networks S.A. - IC* *COM D1 R*
> Rua Irmãos Siemens, 1
> Ed. 1, Piso 1
> Alfragide
> 2720-093 Amadora
> Portugal
> * _Marek.Hajduczenia@siemens.com
> _http://www.marekhajduczenia.info/index.php_
> <mailto:Marek.Hajduczenia@siemens.comhttp://www.marekhajduczenia.info/index.php>_(+351.21.416.7472 4+351.21.424.2082
>
>
>
>
>
--
*************************************************************
Naoto Saeki Project Manager (NEC Certified Professional)
Access Network Project
Broadband Networks Operations Unit
NEC Corporation
E-mail: n-saeki@bl.jp.nec.com
TEL : +81-4-7185-7523 (Ext. 78371)
Cell: +81-80-6600-8697
FAX : +81-4-7185-7939
**************************************************************
All Contents of this Email are Considered NEC Proprietary and
Confidential - Use Pursuant to Company Instructions.
Review of the 10Gigabit Ethernet Link Model.pdf