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Dear All, I think Goerge’s list is quite comprehensive and complete. I would just add the following parameters:
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Micro-Interruptions (How long, how frequent), e.g. due to vibrations and associated contact faults at the plug
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Dynamic Effects, e.g. due to vibrations or temperature drift changing the twist or cable setup over time, especially on figures like:
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Cross Talk(f,t)
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Insertion Loss(f,t)
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Return Loss(f,t)
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Frequency stability (crystal, temperature) KR, Mario From: George Zimmerman [mailto:gzimmerman11@xxxxxxx]
To help Chris write his letter, I thought I’d get some parameters onto the reflector and others can add things they think we need to know from a PHY perspective. Please reply and add as needed -george George Zimmerman CME Consulting Some parameters needed for PHY – For known, economically feasible cabling: Insertion loss over as much frequency as possible of a single pair
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New (what a lab demo might show)
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Aged, under temperature extreme Return loss over same Pair-to-Pair power-sum crosstalk transfer functions over same & common installation practices near-end crosstalk for multi-pair cables far-end crosstalk for multi-pair cables Power sum Alien crosstalk (6-around-1 pair-to-pair for single-pair cables) as above Near end Far end External noise sources typical Stationary (including frequency content) Time variable (things that come and go) Impulse noise – pulse width distribution, pulse count, and any frequency data RF ingress – tones? Modulated signals (e.g., cell phones)? |