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All, I need to make a typo correction to my
last statement in the just-previous thread. The cost of cabling to
support SR4 is typically ~50% of the cost of cabling to support SR10, simply because
typically the number of 12-fiber subunits is halved. Channel design
choices that introduce extra connections to reduce unused fibers modulate that
rule-of-thumb. Sorry for any confusion I may have caused. Paul From: John, Thanks so much for this exploration, which
addresses just the sort of questions that have been puzzling me. In fact
I was wishing for a good comparison to SR10 just today. I see some good
parallels to Ali’s work emerging. While it is not clear to me how much
support exists for FEC behind optical interfaces, it would be quite helpful if
your material could address how the addition or substitution of FEC affects the
numbers. If the outcome is that FEC allows QSFP+ form factor, then that
seems to enable common forms between fiber and copper media, which to me look
like a big advantage to the user and vendor, if not for near-term aggregation
switch ports at least for future server and access switch ports. I also request the same clarification as
Jeff. If you need assistance with cabling cost particulars, I can
help. I have been analyzing cabling costs in my efforts to add such
analysis to the solution analyzer spreadsheet. A reasonable assumption
for the cost of SR4 cabling is ~40% of SR10 cabling cost. Regards, Paul From: John, Great effort. On your slide 2, can
you make clear whether your conclusion includes the MMF cabling cost? Jeff From: Hello Jonathan Attached is a draft
presentation prepared for the Have MMF ad hoc
conference contact details for Tuesday been distributed? Regards, John From: Jonathan King
[mailto:jonathan.king@xxxxxxxxxxx]
Dear all A reminder
that there will be an MMF ad hoc meeting on Tuesday 17th Jan
2012, from 8am to 10.30 am PCT, in order to minimize the overlap with a
concurrent OIF meeting. If you have material
to present, please let me know before hand. Thanks Jonathan +1 408 368 3071 |