SFF-8449, SFF-8636 Conference Call Minutes, October 22, 2009
Barry.Olawsky at hp.com
Mon Nov 2 15:39:28 PST 2009
* From the T10 Reflector (t10 at t10.org), posted by:
* "Olawsky, Barry" <Barry.Olawsky at hp.com>
Minutes of SFF-8636, SFF-8449 conference call October 22, 2009
Mr. Min-Jie Chong Agilent Technologies
Mr. Greg McSorley Amphenol
Mr. Jim McGrath Cinch
Mr. Mickey Felton EMC
Mr. Elwood Parsons Foxconn Electronics
Mr. Barry Olawsky Hewlett Packard
Mr. Harvey Newman LSI Corp.
Mr. Tom Palkert Luxtera
Mr. Michael Rost Molex Inc.
Mr. Galen Fromm Molex Inc.
Mr. Richard Haats National Semiconductor
Mr. Bob Clark NetApp
Mr. Tim Simons PMC-Sierra
Mr. Alvin Cox Seagate Technology
Mr. Dan Smith Seagate Technology
Mr. Joel Meyers Tyco Electronics
Mr. Scott Shuey Tyco Electronics
Mr. Atul Sharma Volex, Inc.
Mr. Toney Chew Volex, Inc.
Mr. Michael Koffman Western Digital Technology
20 in attendance
Discuss proposed content for SFF-8636 (Common Management Interface) and
SFF-8449 (Mini Multilane Series Management Interface). SFF-8436 (QSFP+ Copper
and Optical Transceiver) is to be used as a basis for SFF-8636.
The discussion began with Barry Olawsky (HP) showing an SFF-8636 draft of
everything excluding the memory map sections. Mickey Felton (EMC) suggested
adding historical information to explain how the memory map has been
documented in the past for other connector implementations and how SFF-8636
together with referencing documents (for example, SFF-8449) provides a
complete design specification.
Barry noted that the current draft does not include a diagram showing the
end-to-end link with the management interface scope limited to each end of
After the draft review was complete, the memory map limitations were
discussed. Barry stated that he had reviewed the memory map and concluded
that no room for passive cable parameters was available. Such parameters are
to be stored in locations 128 to 255. A suggestion was made to reassign a
portion of the vender specific region to new passive cable parameters. Harvey
Newman (LSI) expressed concern that some venders would have likely used those
locations already. One participant commented that they had done so. Tom
Palkert (Luxtera) recommended using the actual length of the cable to
estimate propagation delay. Alvin suggested we contact Tim Symons (PMC, no
longer on the call at that point) to fully understand the cable propagation
issue and how precise the delay numbers need to be. Barry indicated that he
would document the delay calculations and share his results with the group.
The meeting adjourned at 12 noon CDT.
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Date: Thursday, November 5 2009
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