(The type of cable is to be determined based on the usage system included in the generalized cabling system. For computer network and telephone voice system, 4 pairs of twisted pair cables can be preferred; for occasions with high shielding requirements, 4 pairs of shielded twisted pair cables can be selected; for occasions with low shielding requirements, 4 pairs of non-shielded cables should be selected as far as possible. Shielded twisted pair cable. For cable TV system, 75Ω coaxial cable should be selected. It is used for occasions requiring high transmission speed or high confidentiality.)
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