Measurement criteria for transmitter common mode voltage limit (Figure 118 of 07-339r5)

Jenkins, Mike Mike.Jenkins at lsi.com
Thu Sep 27 13:11:34 PDT 2007


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Alvin & all,
This is to point out the pattern FC developed for the "spectrally flat"
requirement.  The pattern described in the link below (authored by Tom
Lindsay) is reasonably spectrally flat within the limits of 8B10B code,
and is 'payload only'.	That is, it is permitted to package this into a
protocol-compliant string for test purposes.
http://www.t11.org/ftp/t11/pub/fc/pi-4/06-787v0.pdf 
The doc names this pattern 'SJPAT' but it has since been re-acronymed
'JSPAT'.  (Don't ask.  ;-)
Regards,
Mike
________________________________
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of
Alvin.Cox at seagate.com
Sent: Thursday, September 27, 2007 12:05 PM
To: t10 at t10.org
Subject: Measurement criteria for transmitter common mode voltage limit
(Figure 118 of 07-339r5)
Measured with 1 MHz resolution bandwidth. 
Range of 100 MHz to 6 GHz. The end points are at the center of the
measurement bandwidth. 
What data pattern? CJTPAT. It would be better with a spectrally flat
pattern. Investigate SAS options to achieve this. Idle mode with random
scrambled data? 
Alvin Cox
Seagate Technology, LLC
Office 405-381-8067
Cell 405-206-4809
E-Mail	alvin.cox at seagate.com



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