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Dr. Phil
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re: Flickering bulbs clue to signal integrity problem
Dr. Phil   8/27/2010 1:30:34 AM
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Something we sometimes forget...we have resources among us we fail to utilize. Thanks Dwight for the reminder! p

WKetel
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re: Flickering bulbs clue to signal integrity problem
WKetel   8/28/2010 1:26:22 AM
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What would have been much simpler and a lot less expensive would be to put a resistor across each neon lamp. Perhaps 10K ohms, although in PLC work we use 5600 ohm resistors. It totally prevents undesired triggering .

Dan Mitten
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re: Flickering bulbs clue to signal integrity problem
Dan Mitten   8/28/2010 3:15:51 AM
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This is a great story, with even greater educational value. WKetel, I agree the robustness of using a high voltage system was lost by allowing it to also be a very high impedance system, as well. Ah, nothing like adding a ballast resistor from time-to-time.

Guru of Grounding
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re: Flickering bulbs clue to signal integrity problem
Guru of Grounding   9/1/2010 8:19:36 PM
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If shielded wires solved the problem, then it was not a magnetic field coupling issue but an electric field issue. At power frequencies, "shielded" cables do absolutely nothing to combat magnetic field coupling. The extremely low operating current of the NE-2 means that a long wire could easily couple (capacitively) enough energy from nearby high-voltage wiring to make it glow.



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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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