公开(公告)号：US3906174A

公开(公告)日：1975-09-16

申请号：US41648073

申请日：1973-11-16

Applicant: GTE AUTOMATIC ELECTRIC LAB INC

Inventor： DOTTER JR BERTON E

IPC: H04L1/24 ,  H04B3/46

CPC classification number: H04L1/247 ,  H04L1/24

Abstract: A pseudo-random, pseudo-ternary pulse train, which is representative of a PCM signal, is applied to one end of a cable pair. At the other end of the cable pair, the received pulse train is equalized and amplified to obtain a pulse train output in which pulses have very nearly the same peak amplitude as each transmitted pulse, plus a characteristic which is similar but not identical. A variable amplitude interfering tone is combined with the equalized and amplified received pulse train. If no errors are determined by an error detector with a 0 amplitude interfering tone, the amplitude is increased until errors occur. The interfering amplitude control is calibrated in terms of eye degradation factor. The magnitude of the eye degradation factor is determinative of the capability of the cable pair to transmit the PCM signal with an acceptable error rate.

Abstract translation: 将代表PCM信号的伪随机，伪三元脉冲串应用于电缆对的一端。 在电缆对的另一端，所接收的脉冲串被均衡并被放大以获得脉冲串输出，其中脉冲具有与每个发射脉冲几乎相同的峰值振幅，加上类似但不相同的特性。 可变幅度干扰音与均衡和放大的接收脉冲串组合。 如果没有错误由具有0幅度干扰音的误差检测器确定，则振幅增加直到发生错误。 干扰幅度控制是根据眼睛退化因子进行校准的。 眼睛衰退因子的大小决定了电缆对以可接受的错误率传输PCM信号的能力。