Spool for optical bare fiber 1KM with SC FC ST LC connector Dummy fiber 

An OTDR dummy fiber, which connects the OTDR to the link-under-test, discloses the insertion loss and reflectance of the near-end connection.A fiber ring serves as both a launch cable and a receive cable. OTDR Dummy fiber is used in conjunction with an OTDR to measure complete link loss of a fiber.They are also known as pulse suppressor cables, launch cords, launch leads, receive cablesor fiber rings.

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