There are two definitions to explain what dark fiber is.
The first definition means a fiber optic, coming from fiber optic cable, which is not powered, disabled. In the industry we refer to it as dead, available or dark since it is not lit (reference light).
The second definition means a fiber optic, coming from a fiber optic cable, which is powered, but activated by user owned equipment. In this case, the operator does not provide any active equipment, it provides only passive equipment.
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