【摘要】 通路稳定度共分两种:第一种规定在额定净衰耗、双方开路时测试。它测算简便,但不大符合实用状态。第二种规定在额定的传输衰耗、平衡衰耗及标准偏差状态下,求得一定的合格概率。它测算较繁,但比较符合实用状态。我国铁路采用第二种通路稳定度,且音频四线转接不增加哀耗。故本文重点讨论第二种,并将两者加以比较。更多还原

【Abstract】 Channel’s stability is divided into two kinds: The first one is that to define the net losses, measured during open eicuit of two sides. It is simple to measure and calculate, but it is not very correspondent to the practical situations.The second one is that to define the transmission losses, equilibrium losses, and standard deviations, to obtain a certain qualified probability. It is complex to measure and calculate, but it is very correspondent to the practical situations.The railway system of our country adopts the second channel’s stability, not to increase losses of voice frequency four-wire connection. This paper emphasizes to discuss the second one. and comoares with the first.更多还原