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dick_freebird
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re: What's mine is mine, what's yours is negotiable
dick_freebird   10/30/2012 3:34:13 PM
NO RATINGS
As a longtime lab denizen I find this belief that you can get good quality measurements through a layer of remote switching gear and there-and-back cable runs, something between humorous and puzzling. If your equipment management fantasy requires me to put all this "stuff" into my carefully crafted bench or rack setups, I'll say "no thanks", eat the budgetary cost and lock the door. Maybe it works for you if everything is "digital" and "slow". But if your product can be tested with a bunch of long cables, switches and random reallocations / e-teardowns in the mix, you're not working on very challenging stuff. It all seems like another matrix-management pipe dream to me. Works great if you've got a sea of uniform and adequate resources. Now tell me the story about how the one guy who can do it, works when you randomly redeploy the one critical piece of gear that makes his rack work.



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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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