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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
(PLEASE NOTE NEW EMAIL ADDRESS. THE OTHER WILL STILL WORK, BUT PLEASE USE THIS FOR CME BUSINESS)
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
Sent via the Samsung Galaxy Note® II, an AT&T 4G LTE smartphone
On 2/12/14 9:15 AM, Darshan, Yair wrote:
Dave and all,