For jumpers, an important performance issue is the performance issue during bending. Due to the fact that UTP twisted pair is generally solid core, it has poor manageable performance. Firstly, the cables are relatively hard and not conducive to bending. Secondly, solid core cables may experience significant echo loss during bending, leading to a decrease in cable performance. Therefore, there are generally clear requirements for the bending radius of solid core cables. For flexible cables with multiple cores specifically used for managing jumpers, there are no such issues.