Re: [802.3_EPOC] Continuing work on EPOC objectivesŠ
My original misunderstanding of the 10^-12 target was that it was
"tradition" (albeit technically founded). What I found was that because
802.3 typically "owns the media" we are able to dictate the operating
conditions and therefore the BER.
In the case of the coaxial cable plant (at least in the N. American MSO
plant), 802.3 will have to work within the bounds that the MSOs work
within. Meaning that 802.3 will not be able to dictate the operating
parameters and therefore may have to live with a lower than desired BER.
I think your suggestion is a good one. Would you be able to discuss the
raw BER and FEC gain on tomorrow's call?
--kan--
--
Kevin A. Noll, CCIE
Principal Engineer
Time Warner Cable
13820 Sunrise Valley Drive
Herndon, VA 20171
o: +1-703-345-3666
m: +1-717-579-4738
AIM: knollpoi
-----Original Message-----
From: <Hajduczenia>, "Marek (ZTE)" <marek.hajduczenia@xxxxxxxxx>
To: Kevin Noll <kevin.noll@xxxxxxxxxxx>,
"STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: RE: [802.3_EPOC] Continuing work on EPOC objectivesŠ
Hi Kevin,
Can you expand on " ... based on a misunderstanding of the expectations in
802.3." ? I looked through EFM PMD definitions and while there are
certainly different levels of BER specified at PMD and FEC block
interfaces, MAC service interface seems to be always provided with 10^-12
BER.
Perhaps before getting into the discussion on the target BER at MAC
service interfaces, we could see what the raw BER is expected off PMD and
what FEC gain is assumed. That might be helpful to understand what the
limitations are, rather than looking at the number only from a perspective
of a number
Marek
-----Original Message-----
From: Noll, Kevin [mailto:kevin.noll@xxxxxxxxxxx]
Sent: 29 April 2012 20:45
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_EPOC] Continuing work on EPOC objectivesŠ
I haven't seen much discussion of the objectives over the weekend. This is
good because you are all supposed to be spending time away from
work-related activities on the weekends. :-)
To bring up a more specific item for discussion - I'd like to hear
suggestions on how to handle Objective 9.
9. PHY to have a BER better than or equal to 10-10 at the PHY service
interface.
We started this objective with a BER of 10^-12 based on a misunderstanding
of the expectations in 802.3. We have heard several opinions on this
leading me to believe that 10^-10 is a reasonable goal.
What problems do you all see with setting the BER goal to be 10^-10?
--kan--
--
Kevin A. Noll
-----Original Message-----
From: <Noll>, Kevin Noll <kevin.noll@xxxxxxxxxxx>
Reply-To: Kevin Noll <kevin.noll@xxxxxxxxxxx>
To: "STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: [802.3_EPOC] Continuing work on EPOC objectivesŠ
SG members,
I will be unable to attend the conference call tomorrow, so we will likely
not work on the objectives.
In order to keep the work moving along, I would like to open a dialog here
on the mailing list. I've copied below the latest revision of the
objectives that were adopted and those that still need work. Please
comment and/or suggest changes to the "TO BE CONSIDERED" set.
ADOPTED IN MARCH
1. Specify a PHY to support subscriber access networks using the EPON
protocol and operating on point-to-multipoint RF distribution plants
comprised of all-coaxial cable or hybrid fiber/coaxial media.
2. Maintain compatibility with 1G-EPON and 10G-EPON, as currently defined
in IEEE Std. 802.3 with minimal augmentation to MPCP and/or OAM if needed
to support the new PHY.
5. PHY to support symmetric and asymmetric data rate operation.
6. PHY to support independent configuration of upstream and downstream
transmission operating parameters.
7. PHY to operate in the cable spectrum assigned for its operation without
causing harmful interference to any signals or services carried in the
remainder of the cable spectrum.
TO BE CONSIDERED
4. Provide at least one physical layer specification that is capable of
operating at :
A baseline data rate of at least 1 Gbps at the PHY service interface when
transmitting in 120 MHz, or less, of assigned spectrum under baseline
plant conditions;
data rates lower than the baseline rate when transmitting in less than
120 MHz of assigned spectrum or when plant conditions prevent a higher
data rate;
data rates higher than the baseline rate and up to 10 Gbps when
transmitting in more than 120 MHz of assigned spectrum or when plant
conditions support a higher data rate;
9. PHY to have a BER better than or equal to 10-10 at the PHY service
interface.
--kan--
Kevin A. Noll
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