Aerial insert

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In a telecommunications, an aerial insertis segment of cabling that rises from ground to a point above ground, followed by an overhead run, e.g. on poles, followed by a drop back into the ground. An aerial insert is used in places where it is not possible or practical to place a cable underground. Ariel inserts might be encountered in crossing a deep ditches, canals, rivers, or subway lines.

Source: From Federal Standard 1037C