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Re: 14 March 2014 Live Chat -- Lethal Software Defects
embeddedbarr   3/14/2014 1:02:48 PM
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@richardst It is customary, when an expert is doing an accident root cause analysis, to reach an opinion that a particular cause was "more likely than not" a primary cause of the accident.  This is because the full list of potential causes generally includes more than one that cannot be ruled out entirely.  However, in this Oklahoma case, the opinion I reached and testified to was that a failure of the engine controller was the only plausible root cause.  This was in large part because both side's accident reconstructions put the driver on her brake at the start of a 150 foot skid mark.  Even if the driver had confused the pedals earlier in the drive, this skid mark (apparently from additional use of the parking brake) was way too long for a Camry at that speed unless the throttle was being held open.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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