Re: [8023-10GEPON] FW: Downstream wavelength
Title: FW: Downstream wavelength
Thank You Jim for Your time,
I will reinstall PowerPoint - probably it is already
asking for it.
Looking forward to discussion at the meeting
Regards
Marek
Hi Marek,
Very strange indeed. The figure you sent back
shows a green section on my machine, labeled "Today's 1 Gb/s downstream (1490
nm)" and the horizontal portion, showing the band per the current 1 Gb/s
specification, plus two sloped lines representing the transition region.
There is another note in green with an arrow pointing to the slope, labeled
"Today's nominal 50 nm transition (comfortable)" In retrospect I could
have made the transition lines narrower than the passband line in order to
differentiate.
The blue RF (broadcast) line does show up on what
you sent back. Near the top right.
The heights and signal powers do not coincide, as I was
not trying to discuss signal powers. When I tried to reflect more accurate
signal power levels, the diagrams became more confusing to me because labels and
transitions got in the way of each other. I may try to improve according
to your comments by the time I get to Dallas.
I have sent the .pdf version to the reflector, and will
attach to this so that you get it before that email is
released.
Thanks very much for your comments.
jim
Jim Farmer, K4BSE
Chief Network
Architect,
Enablence
Technology
FTTx
Networks Division.
1075 Windward Ridge Parkway
Alpharetta, GA 30005 USA
678-339-1045
678-640-0860 (cell)
jim.farmer@xxxxxxxxxxxxx
www.enablence.com
Hi Jim,
Perhaps it will sound strange but that is what I see in the
slideshow:
No green bands whatsoever. That is why I was asking whether
it was my PowerPoint acting up (check on two machines, the same effect).
Concerning the remaining issues - thank You for the
clarification. I would like to note that the explanation on the relation between
the height of the bands and the signal power does not seem to coincide (see the
attached screenshot from PowerPoint) with what I can see on the slide. It is 1
Gbps digital signal band that is much higher than 10 Gbps digital signal band.
There is no RF video band, thus I cannot fully confirm whether it is much higher
or not.
Regards
Marek
Hi Marek,
Sorry for the delay in responding - I had to be out of
the office early this morning.
I showed some wavelength bands on slide 3
that I didn't show later, brown upstream wavelengths for 1 and 10
Gb/s (I am not addressing upstream in this comment), and
for today's downstream (green, also not the subject of this comment, but I
wanted to show how wide the filter transition region is today compared with what
we are proposing). Slide 5 and following should show blue for my proposed
reduced broadcast (auxiliary) wavelength, and slides 5-6 show brown for the
ideal and practical filter passbands for 1577 nm. Slides 7-8 should show
orange for a 1590 nm downstream wavelength. I will try to convert to .pdf
and resend in case there are any issues with power point. I am having
problems with the conversion on my computer, so it may be a few hours before I
can send it.
Regarding the height of the bands, no,
there is no significance to that. I made them different heights to help
distinguish one from another. I do note, though, that a broadcast optical
carrier must arrive at the ONT on the order of 20-25 dB higher than the data
carrier.
Thanks,
jim
Jim Farmer, K4BSE
Chief Network
Architect,
Enablence
Technology
FTTx
Networks Division.
1075 Windward Ridge Parkway
Alpharetta, GA 30005 USA
678-339-1045
678-640-0860 (cell)
jim.farmer@xxxxxxxxxxxxx
www.enablence.com
From: Marek Hajduczenia
[mailto:marek_haj@xxxxxxx]
Sent: Monday, November 03, 2008 5:14
AM
To: STDS-802-3-10GEPON@xxxxxxxxxxxxxxxxx
Subject: Re:
[8023-10GEPON] FW: Downstream wavelength
Hi Jim,
I have two questions
(1) are slides 3, 5, 6, 7 and 8 complete ? There are some
colours in the agenda which do not appear on the slide. Just wondering whether
it is only my PowerPoint acting up or something is indeed missing.
(2) what is the meaning of the height of individual
bands on slide 3 ? If there is any, what is the scale ?
Thank You
Marek
We request to make the attached presentation during
the 10GEPON meeting in Dallas. We remain concerned over the decision to
drop the 1590 nm downstream band from the plan, for reasons shown in the
attached. Note that there are notes that go with most of the slides.
You can see them by going to View|Notes Page
Thanks,
Alan
Brown
Jim Farmer
Jim Farmer, K4BSE
Chief Network Architect,
Enablence
Technology
FTTx Networks Division.
1075 Windward Ridge Parkway
Alpharetta, GA 30005 USA
678-339-1045
678-640-0860
(cell)
jim.farmer@xxxxxxxxxxxxx
www.enablence.com
<<FilterCompare.ppt>>
