humek wrote: here the colors do not matter, pairs are counted and the colors are a conventional thing.
And you were not interested in why you usually have problems with one cable? And why is it brown / orange most often (depending on the manufacturer), but blue tends to break?
CISCO specialists may not explain to you how to calculate integrals, but you may find out why colors are important also for safety reasons. It is enough to read a little. In home and non-professional networks it will work because most often only 4 wires are used and for short distances ... It is also good to wear collars for it to work, but do not complain about the stability and loss of the connection.
By the way ... I wanted to laugh when I saw alarm systems in Dolnoślonskie, connected in such a non-trivial way that it was possible to download the image directly from the cameras, without the control panel knowing ^ _ ^. To make it funnier, the systems were set up by electrical engineers who, as it turned out after the interview, had never heard about electromagnetic induction more than ever.