207804
However , if the propagation delay in a wire , PCB trace , cable , or connector is greater than 1/6 of the rise time of the digital signal , the " lumped " circuit model is no longer valid and the interconnect has to be analyzed as a transmission line .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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