"Brian Goldsmith" wrote
I have just purchased two Cat 5e A type patch cords of different length and manufacture.Whilst both are wired identically (straight through,1 to 1 etc.),I notice the colour codes used are different,one following the 568A code and the other following the 568B code.Could someone advise if a) there is something about Cat 5E I don't know (very possible),b)this is "common" practice and c) it really matter,electrons cant see colour after all!
* Well,I believe the answer is first of all,a) followed by b) followed by c)!!!!!!!!!!!!!!!!!!!
Please see the following which I have just discovered in a google search.
"The 568 committee, with good intentions, decided to allow both wiring methods (568A & 568B) to exist within the 568A Standard. The reason was that at the time, a great deal of cabling plants had been installed to the B standard (formerly known as WECO or AT&T 258A). Even though they allowed both wiring methods, they stated in their standard that 568A wiring would be the preferred method for all new installations. Time, and popular opinion, went in the other direction. The most popular wiring method today is 568B. Having both A & B methods does nothing but cause errors and confusion. Originally, patch panels and jacks were manufactured either A or B. In most cases, they were not labeled as such. Most suppliers stocked only the B wired products. Luckily, today, almost all jacks and patch panels show diagrams for both A and B. The only difference between the two is the interchanging of the 2nd and 3rd pairs (white/orange and white/green, respectively)."
What a typical septic dogs breakfast!!! :-) A bit like the US satellite that "blew" up because the septics couldn't recognise there were some parts made to metric specs and some made to US Imperial!!!
Thanks for the indulgence!