直埋光纜的敷設需要挖溝，挖溝標準為：
一般普通土1.2米、半石質1.0米、流沙0.8米，以及在穿越鐵、公路時需挖1.2米，上述溝底應加墊10CM細土或沙土，溝底寬度一般為30CM。
另外，如需敷設兩條或兩條以上光纜時，光纜間應保持5CM的間距。在路面表層經常受壓的路段應預埋鋼管或預放硬質塑料管。布放光纜在遇有坡度，穿越鐵、公路等特殊地段時應作「S」形敷設。
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What is a direct buried optical cable?
Directly buried optical cables are generally buried directly below, and have the advantages of resistance to external mechanical damage and the prevention of soil corrosion.
The laying of directly buried optical cables requires trenching. The trenching standards are:
The general soil is 1.2 meters, semi-stone 1.0 meters, quicksand 0.8 meters, and 1.2 meters need to be dug when crossing iron and highways. The bottom of the trench should be cushioned with 10CM fine soil or sand, and the width of the trench bottom is generally 30CM.
In addition, if two or more optical cables need to be laid, the distance between the optical cables should be 5 cm. Steel pipes or hard plastic pipes should be pre-embedded in the sections where the surface of the pavement is frequently compressed. The optical fiber cable should be laid in an "S" shape when it encounters special sections such as slope, crossing iron, and highways.
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