Re: [8023-10GEPON] [power saving] New study shows FTTH is a green technology
Marek, et. al.
At OFC/NFOEC 2008 one author made a presentation based on his paper titled
"Energy Consumption in Access Networks." I could not readily find a working
link to the paper online, but it is in the IEEE (LEOS) archives.
I recall it was a basic comparison of access network technology (rated ?)
power consumption. If I recall correctly it was done on a per Mbps basis and
had a reasonable attempt at looking at electrical power consumption across
the network. I believe it was a useful but basic strategic comparison. The
risk is that it isn't really accurate when typical residential broadband
consumption rates remain below 100kbps average (over a 24x7x30 basis). It's
a bit like saying that my crew cab pickup is more efficient than a Prius per
pound of payload (which it is by the way). While true, it does not account
for what might be a typical use. In the case of a PON compared to VDSL or
DOCSIS, the efficiency is a more a capability than always a fact --
depending on the data load.
For the super-green analysis I am not sure that anyone has done any work
comparing the energy cost of manufacturing glass vs. coax or tp. And the
same would have to be done for the electronics and optics vs. the incumbent
technologies.
I would also point out that none of these studies adequately account for:
1. Opex and truck rolls (which would be a + for PON)
2. statistical multiplexing, aggregation and IP routing (which would likely
be a huge - for most PON systems since nearly all are access multiplexers
and do require a second external box to do policing, subscriber management,
lea, IP routing, etc. In at least the case of DOCSIS, this doubles the # of
boxes required for PON vs. CMTS, etc.
3. The lack of CPE integration in PON. (again a - for PON since most systems
have not yet integrated PON ONU/ONT into customer premise routers, etc. --
one huge exception is Verizon's JI-ONU -- which is probably the single most
power, space, network, and energy efficient broadband customer access device
per Mbps for voice/data/video -- available).
Victor Blake
victorblake@xxxxxxxxxxxxxxx
-----Original Message-----
From: Marek Hajduczenia [mailto:marek_haj@xxxxxxx]
Sent: Tuesday, September 30, 2008 10:30 AM
To: STDS-802-3-10GEPON@xxxxxxxxxxxxxxxxx
Subject: [8023-10GEPON] [power saving] New study shows FTTH is a green
technology
Dear all,
Today I can across an interesting piece of an article on Lightwave at
http://lw.pennnet.com/display_article/340363/13/ARTCL/none/XMARK/1/New-study
-shows-FTTH-is-a-green-technology/ if anybody is interested in reading it in
more detail.
The results are quite interesting and I was wondering whether anybody had
any comments on how it is applicable to our power saving activities we spent
some time discussing at the last meeting.
Regards
Marek