IBM position on Mini SAS Connector
Theodore Vojnovich
tbvojnov at us.ibm.com
Tue Mar 17 06:19:39 PDT 2009
Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r0903172_f.htm">HTML-formatted message</a>
Here is IBM's view and position on the Mini SAS proposals:
IBM's position on the high density SAS connector definition prefers the
Molex solution subject to providing some additional information:
- Current reasons for the preference:
- Wiring, PCB, and placement constraints appear to be more
feasible with the Molex solution. Specifically
- Other proposals indicate that the wiring channels
needs to cross over each other to get to the connector
- This drives more layers in the board and
constraints on the physical channels
- The connector arrangement in 1 dimensional scale out
provides the following:
- Smaller footprint on the board
- Takes advantage of the perpendicular axis to the
board for connector pins and such.
- Less connector complexity (aka cost) since no
interposer
- No "over/under" issues on extracting a subset of
ports (ie easy user access to the port group...aka stays away from the
issues with stacked RJ45s)
- Although common to all proposals, it should be required
that this connector be supported for 6G and 12G operations
- Having it for 6G would allow platforms over the
next couple of years to have a connector/cable scheme that last beyond 6G.
- The additional information that needs to be provided/resolved:
- The connectors should be keyed to prevent wrong or flipped
insertion
- The connectors should be shielded on all sides to prevent
physical damage and EMI issues
- The number of plug cycles intended for this family of
connectos needs to be stated and should probably be on par with the plug
cycles of the current connector schemes.
- There needs to be an addition to the proposal to allow
hybrid cables so that equipment with older connectors can be attached to
equipement with this new connector.
Thanks
Ted Vojnovich
STSM Blade Center Storage Solutions
IBM Corp.
N202 / B205
3039 Cornwallis Dr
RTP NC, 27709
Voice: 919-254-0730 (T/L 444-0730)
Fax: 919-543-2820
Cell Phone: 919-656-5061
Email: tbvojnov at us.ibm.com
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