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Just to add my 0.02$,
When POE LED lighting becomes a commodity anyone could install it on his desk lighting by using /running RJ45 cable ,
you cannot trust everyone to be a professional installer , so any robustness issue need to be looked at with this understanding that we are looking at a commodity solution at the end,
and the end user might be the one to install it and not only a professional installer.
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Hugh, and John – Yes, and Yes. Crossovers are a part of life, and are valid. Wiring errors are also part of life, even if they are invalid according to standards.
Immunity to pair swap is generally listed in the objectives of modern BASE-T PHYs. As a result, data transmission in Ethernet systems is immune to, if not blind, to these defects, whether they are legal or not.
If we are going to consider removing the robustness against pair swaps from powering, what we will need is some kind of data-gathering exercise that spans multiple installations and installation classes. It’s a big job, and has to include not just the professional installation and cabling community but also the end-user IT manager community – because these things change over time, and we will be running on cabling installed years ago, with additions and changes made over time.
Principal, CME Consulting
Experts in Advanced PHYsical Communications Technology
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We need to be clear – crossover cables are not, in any way, faulty. Crossover and straight-through are part of standard connectivity.
Has anyone spent time with cable installers? Bad installations or crossed cables will always be blamed on the vendor
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On 2/12/14 9:15 AM, Darshan, Yair wrote:
Dave and all,