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1.前言同轴电缆的内导体(管状的)中放入其它的电缆,组成二层结构的复合形电缆已经研制出来了。这种电缆是以铁路沿线的通讯一元化为目的的,其内部的电缆作为载频、讯号用,外部同轴电缆可供列车通讯用。
1. Introduction The coaxial cable inner conductor (tubular) into the other cables, composed of two-story composite cable has been developed. This kind of cable is based on the unified communication along the railway. The internal cables are used as carrier frequency and signal, and the external coaxial cable is used for train communication.