What are the requirements for cable specification layout?

1. Cable laying should be redundant. The reserved cable length between handover room and equipment room is generally 0.5 ~ 1.0m, and the working area is 100 ~ 300mm. If there are special requirements, the length should be reserved according to the design requirements. (See GB/T503 12? 2000) 2. The bending radius of the cable when turning shall meet the following requirements: u The bending radius of the unshielded 4-pair twisted pair cable shall be at least 4 times the outer diameter of the cable and at least 8 times during construction. U The bending radius of shielded twisted pair cable should be at least 6 ~ 10 times of the cable outer diameter. The bending radius of U-shaped trunk twisted-pair cable should be at least 10 times of the cable outer diameter. 3. Generally, there are two ways of horizontal twisted pair: unshielded and shielded. When using shielded cable, the shielding method is different and the cable structure is different. Therefore, when laying shielded cable, according to the shielding method, the bending radius should be 6 ~ 10 times of the cable outer diameter. 4. When laying cables, the distance between cable fulcrums during traction should not be greater than1.5m.. 5. Line speed and cable pulling speed Theoretically, the smaller the diameter of the conductor, the faster the cable pulling speed. However, experienced installers will pull the cable slowly and steadily instead of pulling it quickly. The reason is that pulling the cable quickly will lead to the cable winding or tripping. If the tension is too large, the cable will be deformed, which will lead to the decline of the transmission performance of the cable. 6. Maximum allowable cable Zhang Liwei: u 1 4 twisted pair cable, Zhang Liwei100n (10kg); 4 pairs of twisted-pair cables with U 2 tension of 150N( 15kg); U 3 4 pairs of twisted-pair cables with a tension of 200 N (20 kg); U n 4 twisted pair cable, Zhang Liwei n×50+50(n). For category 5 UTP cables, the maximum pulling force of u 25 should not exceed 40 kg, and the speed should not exceed 15 m/min. 7. In order to terminate the cable pair, the construction personnel should peel off the sheath of a section of cable. For the high-density termination on the 1 10P wiring frame, the cable sheath should also be stripped to facilitate bending and assembly. Do not scratch the insulation layer when stripping cable sheath, and use special tools to strip it. 8. Don't pull and bend the cable pair separately, but pull the stripped cable pair tightly together and bend it. Peel off the cable sheath long enough for termination. For the wires terminated on the connector, the twisted state should be kept as much as possible, and the untwisted length of Category 5 wires must be less than13mm.