George,
Economic
Feasibility doesn't address market. Broad market potential does.
If one bases the
broad market potential on connecting aggregation elements, the economic
feasibilty argument should show the technology has feasibility for that
market. If one bases broad market potential on desk top, then it better have
economic feasibiity for that market (which requires lower cost than the
aggregation interconnect market).
The 5 criteria and
objectives aren't each isolated items. They need to be consistant with each
other. If they aren't, one is likely to produce a standard that doesn't get
used.
With 10GBASE-T, I
don't think either of those is the basis for broad market
potential.
If we are
successful, then some 10GBASE-T will be used for aggregation interconnects,
but most of the aggregation will be of a distance that requires fiber or
within the closet at short enough distances for CX-4. I don't think the niche
between those two in the aggregation interconnects space is big
enough to justify broad market potential. 10GBASE-T will presumably be
too expensive for desktops for some time and it will be quite a while
before desktops need 10 Gig. Also, there isn't much point in putting a 10
Gig adapter into a desktop until desktops start having PCI
Express slots (or one of the other high speed
alternatives).
The
market where 10GBASE-T will be very useful initially is the data center
to connecting servers and, with the help of iSCSI and other IP storage
initiatives, storage devices.
The objectives,
technical feasibility and economic feasibility should address the needs of
that market.
Regards,
Pat
Guys,
I would like to point at
the Economic Feasibility bullets:
- Cost factors known, reliable
data
- Reasonable cost for performance expected
- Total installation
costs considered
None of these are concerned with how many units will
be sold or whether there will be payback on development costs, etc. I think
the word Economic is being misinterpreted in the present
discussion.
Further, the need for 10Gig arises from increasing data
speeds and volume. With 1000BASE-T about to be rolled out to desktops, the
aggregation network elements need to go faster. That's the way it has worked
at previous levels; why not now?
And if not, why was the ae standard
created and adopted with four different PHY's?
George Eisler