铝管外导体物理发泡射频同轴电缆主要用于有线电视系统中作干线、配线传输线。
RF coaxial cable with gas expanded, PE insulation and aluminium tube sheath is mainly used in cable TV system as trunk and distrubution transmission lines.
现行的从电缆主干线上取得分支线的方法就是切断主干线，将干线两头和所分的支线一同压接后包裹起来，或是将分支线绑轧在主干线上。
The current method to branch wire from the cable trunk is to cut off the trunk line, and crimp two ends of trunk line and the required branch, and pack them, or to bind the branch line to trunk line.
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