Twisted pairs are used to cancel the electromagnetic waves generated when current flows, and round cables are much better than flat cables de214af95767-image-20220915204459096.png e3b9bae93498-image-20220915204551766.png 2463aa6be56b-image-20220915204609305.png Different lengths of the twisted pairs for receiving and sending causedelay skew(severe). By setting standards for twisted pairs and setting a fixed value for the skew, point to device can handle delay skew on its ownd385e68567d4-image-20220915204700384.png Telephone lines are analog signals, data is digital signals. Compared with analog signals, digital signals have higher requirements for the cable material Starting from category 5 cable, all Ethernet cables are 4 groups of twisted pairs Standards cb9d51078fe8-image-20220915210124852.png 27fc0c05b59e-image-20220915210134006.png 186f288a809b-image-20220915210142029.png c164172eaa1e-image-20220915205241459.png 5a02968ad306-image-20220915205406466.png

AWG: American Wire Gauge ea7453a3d195-image-20220915205451872.png

Starting from category 6 cable, because of the upgrade in wire gauge, cables are getting thicker and thicker, making it very difficult to pull and replace cables during home wiring. It is recommended to leave a few optical fibers when embedding cables, to facilitate FTTR fiber to the room in the future ed3bc933a510-image-20220915205836457.png ff1c373d0d08-image-20220915205924743.png

09896a5150ab-image-20220915205954179.png For ultra soft cables and flat cables, the shielding effect is usually poor or the performance does not meet standards