From: Felton_Mickey@emc.com
Subject: RE: SAS 2.1 connector considerations
Date: Mon, 24 Nov 2008 17:17:29 -0500
To: <Alvin.Cox@seagate.com>, <t10@t10.org>
X-Message-Number: 9345
Formatted message: HTML-formatted message

Before I could add any input here I'd rather get more questions off my
back.
- Bend Radius of cable options
- Bend radius of cable options when multiple cables in a modular design
get merged together? And the stress that produces on the card?
- Room for LEDS on either side of the connectors and still fit in the
PCI form-factor?
- EMI performance modelled? Common mode impedance/s-params simulations?
- Keying options? Even though we shouldn't have them...
- Release mechanisms push-pull? Does it matter?
- Heatsink capabilities on connector body?
- Color coding the body of the cable/connector?
If the design was modular, a power pin per x4 block would answer alot of
your questions below. As would using I2C or other such 2 wire/3 wire
management interfaces on a per x4 block design.
________________________________
From: owner-t10@t10.org [mailto:owner-t10@t10.org] On Behalf Of
Alvin.Cox@seagate.com
Sent: Monday, November 24, 2008 2:25 PM
To: t10@t10.org
Subject: SAS 2.1 connector considerations
Feedback from users would help to narrow the selection field and number
of proposals to better fit the application model. In addition to the
posting by Alvin Cox regarding the input from the November t10 meeting,
a few opinions would be extremely helpful. Please consider both internal
and external applications. 
08-453 <http://www.t10.org/cgi-bin/ac.pl?t=d&f=08-453r0.pdf>;  
Is a modular design favored over a set number of connections? 
	This would likely consist of 4x blocks and could allow for
multiple cables or different single cables that have the 4x, 8x, 12x,
16x configurations. 
	Trade-off of modular may be encountered due to area. 
	Suggestions for sideband support? 
		Separate module? 
		Include in one module? 
		Duplicate on all modules? 
			Partial or all lines? 
Sidebands? 
	How many required for internal and external? 
	Does external provide more information than just cable power and
type? 
Power requirements? 
	How much power is required for a 16x configuration? 
		Copper 
		Optical 
	What voltage and current? 
		Cable perspective 
		User perspective 
Alvin Cox
Seagate Technology, LLC
Office 405-392-3738
Cell 405-206-4809
E-Mail	alvin.cox@seagate.com