Crosstalk avoidance , and many other aspects that are critical in routing practice including congestion , vias , layer preference , etc . , are taken into account . a track reservation strategy is adopted in the algorithm framework to compensate the undesired effects caused by sequential routing 这些中间阶段包括层分配确定线网各段所在的布线层轨道分配确定较长线段占据的轨道屏蔽插入在某些轨道上插入屏蔽线等。
Both ends of the shield are a " floating " ground in most cases , and this creates a complex circuit network consisting of the complex impedance to ground of the output circuit at one end , the complex input circuit impedance at the other end , and the resistance , capacitance , and inductance of the cable in between 大多数情况下屏蔽线两端是“漂移”的接地端，这就形成了复杂的电路，这个电路的一端相对输出端的接地点有复杂的阻抗，另一端又有复杂的输入阻抗以及连接线的电阻，电容和电感。
