Re: [802.3_EPOC] Action items for September 2012 meeting
Good morning all
I want to point to some historical perspective on the topics below.
Historically:
SUB-SPLIT: defined as a cross over point of 42 MHz where the sub-low return
is below 42 MHz with the forward being above.
That places an EXTENDED SUB Split at 88 MHz, the start of the FM radio band,
where everything below 88 MHz would represent return and everything above 88
MHz is the forward.
MID-SPLIT defined the cross over point of the diplex filter as 108 MHz where
everything below 108 MHz represents the return band. Everything above 108
MHz represents the forward.
HIGH SPLIT is a little more difficult to define. Traditionally the high
split was placed above channel 13 top end frequency is 216 MHz where
everything below 216 MHz is return and above is forward network.
TOP SPLIT is interesting and, again, historically first appeared as a result
of TWC FSN (Full Service Network - if my memory is correct) a proof of
concept network built in Orlando, Florida but was referred to, in my
recollection, as HIGH RETURN. So I think we need to rethink and reflect on
how this is described. To Jeff's point, today this reflects a "tri-plex
filtering system.
Incidentally, HIGH RETURN, at the time was considered not feasible for use
for 2 reasons: 1- it placed a top end limit on what cable operators could
offer for services and limited channel growth and 2- it required too much
power to operate a return in for a communications channel. With everything
moving to an IP delivery which frankly could mean unbounded channels the
capacity limit in number 1 above may be moot. As for number 2, because power
amplifier technology has evolved along with modulation, detection and error
correction schemes, this may be more attainable but also may require
significant changes in network architecture.
I hope this presents some perspective which we may want to follow for
consistency at this point.
Regards
Tom
-----Original Message-----
From: Marek Hajduczenia [mailto:marek.hajduczenia@xxxxxxxxx]
Sent: Monday, July 23, 2012 1:30 AM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_EPOC] Action items for September 2012 meeting
Jorge,
I included both proposed definitions. Until clarification on the use of
top-split is made, I will keep the term in the list tentatively and follow
the discussion.
Marek
-----Original Message-----
From: Salinger, Jorge [mailto:Jorge_Salinger@xxxxxxxxxxxxxxxxx]
Sent: 22 July 2012 10:28
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_EPOC] Action items for September 2012 meeting
Marek,
I think I would correct the definitions of Mid- and High-split, as follows:
Mid split: an HFC network in which the split between the upstream and
downstream occurs between 65 and 100 MHz
High split: an HFC network in which the split between the upstream and
downstream occurs above 100 MHz
I still have some concern about a conflict between the definitions of High-
and Top-split since they could overlap. Maybe we could solve it in one of
two ways: 1. add something like "the upstream transmission occupies spectrum
below the downstream" for low-, mid- and high-split definitions, or 2. Get
rid of the top-split altogether since we won't be considering that option
(as we discussed in the meeting in San Diego).
I wonder what others, especially my MSO/CL colleagues, think.
Thanks!
Jorge
----- Original Message -----
From: Salinger, Jorge [mailto:Jorge_Salinger@xxxxxxxxxxxxxxxxx]
Sent: Sunday, July 22, 2012 12:14 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_EPOC] Action items for September 2012 meeting
Marek,
To add to your list, here is a start for the definitions for the various
splits, and one additional definition (HFC):
HFC: a hybrid fiber-coax cable network, in which fiber is used to transmit
analog RF signals (note: this definition excludes the case where we have
digital return, but I think that's OK)
Low split: an HFC network in which the split between the upstream and
downstream occurs below 65 MHz
Mid split: an HFC network in which the split between the upstream and
downstream occurs below 100 MHz
High split: an HFC network in which the split between the upstream and
downstream occurs below 200 MHz
Top split: an HFC network in which the upstream is placed above the
downstream
Hope this helps.
Jorge
-----Original Message-----
From: Marek Hajduczenia <marek.hajduczenia@xxxxxx>
Reply-To: Marek Hajduczenia <marek.hajduczenia@xxxxxx>
Date: Thursday, July 19, 2012 3:48 PM
To: EPoC Study Group <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: [802.3_EPOC] Action items for September 2012 meeting
>Dear colleagues,
>
>Following the discussion in the morning, focused on the preparation for
>September 2012 meeting, I would like to start discussion on terminology
>for EPoC, as attached to this email. What I did so far, was to go
>through the contributions discussed so far, to collect the terms which
>were used most commonly in presentations and discussions, with the
>special focus on terms generating heated discussions (infamous PHY).
>The content is colour coded:
>
>- a term in green indicates that we have already a solid definition in
>802.3, which ought to be reused without changes
>- a term in yellow indicates a term which is specific to EPoC, and I
>felt sufficiently capable to propose the pass at the definition
>- a term in red indicates a wording which I collected from one of
>contributions, but it requires either further discussion, clarification
>or confirmation whether it is needed at all.
>
>In the first pass through the list, please indicate whether any
>critical terms are missing or unnecessary. My intent at this time is to
>collect a complete list of terms, before we plunge into producing
>missing definitions.
>Please keep all discussion on the reflector so that we do not talk past
>each other or repeat proposals. I will try to keep the list updated as
>frequently as needed.
>
>Given that definitions are critical for technical discussions on
>individual proposals, I'd suggest we complete the phase of collecting
>terms by the 28th of July, at which time I will move to generating
>individual missing definitions.
>
>Regards
>
>Marek
>
>_______________________________________________________________________
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>
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