模拟电话信道对数据传输的限制

The limitation of the analog telephone channel bringing to data transmission

模拟电话信道既能传输传真数据 ,又能对数据传输进行限制 .影响数据传输质量的主要因素为 :群时延失真、衰减失真以及回波引起码间干扰 ;谐波失真与噪声会降低噪比 ;

The analog telephone channel can transmit facsimile datas,at the same time,limit the data transmission.Group delay distortion,attenuation distortion and echo will cause the intersymbol interference.Harmonic distortion and noise will decrease the synal to noise ration.Besides,phase jitter and phase hit will lead to the error code.