3 ms·

> And designed that way for specific reasons. Do you know that reason? I was wondering in my other reply.

• garaetjjte 4y ago
  It's some legacy from scheme used in RJ connectors used in telephony, where first pair was on connector center and it continued outwards with each pair (like this, where each digit is pair: 4 3 2 1 1 2 3 4). T568 only retains this scheme for two pairs, maybe they realized that splitting last pairs across entire 8 pin connector would be unwieldy. Nothing stops you from wiring connectors different way though, to the annoyance of anybody splicing that cable in the future :)
  • robocat 4y ago
    > Nothing stops you from wiring connectors different way though You can only swap the wires in a pair (eg swap solid orange and striped white/orange), or swap pairs (eg blue pair with orange pair). You must keep each twisted pair matched, so that the electrical signal travels correctly, otherwise you run into problems at length. For very short runs I would guess you could ignore pairs, even though it would increase crosstalk (between signals within a cable) and interference (aerial like transmission or reception, especially with different cables run close together). Great picture of different twists per centimetre comparing each pair within a cable (compare orange against blue in one cable), and also shows the different twists for different cats (less for cat5, more for cat6): https://store.chipkin.com/articles/differences-between-category-5-cat5e-and-cat6-patch-cables https://store.chipkin.com/articles/differences-between-categ... — if the twist lengths of all pairs were exactly the same within a cable, there would be a lot more crosstalk between pairs.
• gumby 4y ago
  You can plug an RJ-11 plug into an RJ-45 jack and get two phone lines.