Teledyne LeCroy QPHY-SAS3 - Manual (Page 22)

Figure 12 - SSC Test Results
In the Measure section:
• Max Freq and Min Freq (P1 and P2) are calculated by measuring the minimum and maximum of
the Unfiltered SSCTrack (F3). These are the measured values for Tx - SSC Mod Freq Min and
Tx - SSC Mod Freq Max (5.2.2). For 12Gbps these values must be in between +/- 1100 ppm in
order to pass this test for center-spreading and -1100 and 100 ppm for down-spreading. For
1.5Gbps, 3Gbps, and 6Gbps these values must be in between +/- 2300 ppm in order to pass this
test for center spreading and -2300 and 100 ppm for down spreading.
• Variation P-P (P3) is the difference between the Max Freq and Min Freq of the Unfiltered
SSCTrack. This is the measured value for Tx - Variation P-P (5.2.2). This is test is informational
only.
• Mod Freq (P7) is calculated by measuring the frequency @ level of the Filtered SSCTrack (F2).
This is the measured value for Tx - SSC Mod Freq (5.2.1). This value must be between 30kHz
and 33kHz (inclusive) in order to pass this test.
• MinDFDT and MaxDFDT (P9 and P10) are calculated by measuring the minimum and maximum
of the DFDT (F4). This is the measured value for Tx- SSC DFDT Min and Tx- SSC DFDT Max
(5.2.3). These values must be between +/-850pm/us in order to pass this test. This test is not a
required test and is informative.
• Imbalance (P12) is a measure of the deviation asymmetry of the DFDT. It is measured by taking
the sum of the averaged max peak level and the averaged min peak level. Rather than measure
the absolute value, the software measures the signed value to provide additional insight. This is
the measured value of Tx – Deviation Asymmetry (5.2.2b). This value must be between +/- 288
ppm in order to pass this test. This test is only required on SSC with center spreading.
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