If the transmitted impulse also passes through the analog front end (AFE) of the modem, then any reflections due to any local impedance mismatches must be compensated.

• 如果发射脉冲也经过了调制解调器的模拟前端（APE），那么由于环路阻抗不匹配造成的反射脉冲必须予以补偿。