Exfo iOLM Manuel d'utilisateur télécharger pdf (Page 15)

Introducing the intelligent Optical Link Mapper

intelligent Optical Link Mapper 9

Launch, Receive, and Loop Fiber

The loopback measurement is designed to test duplex cables.

In a loopback measurement, one end of the first fiber is connected to the

iOLM through a launch fiber, while the other end is connected to the

second fiber using a fiber called a loop. Usually, a receive fiber is used on

the proximal end of the second fiber. The loop fiber can be viewed as a

receive fiber for the first fiber (the one the iOLM is connected to) and a

launch fiber for the second fiber.

The loopback process performs one single acquisition for both fibers, then

automatically splits the result, providing independent measurements for

both fibers in the duplex cable.

The automatic split of the initial measurement can only be performed if the

length of the launch, loop and receive fibers are properly specified in the

application.

See Configuring your iOLM on page 42 for more details.

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Exfo iOLM Manuel d'utilisateur Page 15