Does anybody know of standards, guidelines or recommendations that govern pairs 1 and 4 in a UTP crossover cable?
These are the two pairs than DO NOT play a part in the transmission of data in the TIA/EIA standard. The TIA standard says leave them as they are.
I teach a hands-on networking course with real hardware, and have found that some manufacturers either swap pairs 1 and 4 in a crossover assembly, or leave the pairs in their TIA defined position and swap the individual wires in each of these pairs. I can find no way to explain these variations to my students.
If anyone can help you'll be demystifying part of our industry to me as well as the students.....Thank you