Dark fiber is optical fiber infrastructure that is in place but un- or
under-used. Through our Dark Fiber Services (DFS), an agency can acquire the
unconditional right of use of a fiber route. The DFS offers the following
mandatory features: collocation service, use of ducts, dark fiber local loop,
diverse route single drop, diverse route dual drop, intercity connectivity,
availability of multiple ducts, off-net laterals (fiber cable from an agency’s
premises to the nearest splice point on the cable trunk, funded by the
DFS is an optional service offered both in the Universal and Enterprise contracts.