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| An optical fiber link segment is the passive cabling that includes cables, connectors, and splices (if present), between two optical fiber connecting hardware termination points. A typical horizontal link segment is from the telecommunications outlet/connector to the horizontal cross-connect. There are three typical backbone link segments:

1. main cross-connect to intermediate cross-connect,
2. main cross-connect to horizontal cross-connect, and
3. intermediate cross-connect to horizontal cross-connect.

Additionally, centralized optical fiber cabling provides a link from the telecommunications outlet to the centralized cross-connect through a splice or interconnect in the telecommunications room. As illustrated, the test includes the representative connector performance at the connecting hardware associated with the mating of patch cords. It does not, however, include the performance of the connector at the equipment interface.

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