Excuse me, what kinds of twisted pairs are the current telephone lines? How many kinds of twisted pairs are commonly used in horizontal network wiring?

Three types of unshielded twisted pair cables are usually used as the backbone of integrated wiring. Generally, the horizontal wiring adopts super-five unshielded twisted pair. Category 6 unshielded is used in places with high requirements, and Category 5 shielded twisted pair or Category 6 shielded twisted pair is used in places with high confidentiality requirements and large interference. Other super six or seven categories are gimmicks of manufacturers, and there is no relevant standard.