Otdr Without Launch Cable

Without launch and tail cords no backscatter is available before the first connector nor after the last.

Otdr without launch cable. Do not ever use an otdr without this launch cable. Fluke networks otdr port saver test reference cords are short 0 3 meter 1 foot fiber optic cables that protect the port on optifiber pro otdrs when placed between the otdr port and a launch cable. Otdr launch and tail cords let the tester measure the loss and reflectance of the first and last connectors in the cabling and also include them in the measurement of overall loss. This help to avoid variations in loss and distance measurements when testing.

Fiber launch packs are designed to aid in the testing of fiber optic cable when using an otdr. Otdr launch pulse and launch cable. Launch fibers place a necessary length of fiber between the otdr and the actual fiber being measured providing both the time and distance required for the otdr to effectively measure the characteristics of the fiber being tested. The length of launch cable used can very depending on the measurement needs.

The launch fiber cable helps to negate blind spots or the dead zones of an otdr which occures when there is high launch power or faults near the. But there are some general rules to follow. Use them to test 50 µm and 62 5 µm multimode and 9 µm single mode sc sc or lc lc terminated fibers. Both a launch and receive cable are needed to measure complete link loss of a fiber with an otdr.

The cable should be longer than either of the following specifications event dead zone or loss dead zone and the pulse length being used. What is a launch cable used for. You always want to see the beginning of the cable plant and you cannot do it without a launch cable. Technicians use this product with optical time domain reflectometers otdr s to help minimize the effects of the otdr s launch pulse on measurement add to cart.

The launch cable is the link between the otdr test port and the fiber link being tested it is used to stabilize the test pulse and to enable the otdr to recover from transmitting the test pulse in order to see. The next step in setting up an otdr test is the proper connection of launch and receive cables at either end of the fiber link. Because very long test cables are impractical to transport and use noyes designed coiled lengths of 50 µm multimode 62 5 µm multimode or single mode fiber conveniently packaged in compact rings. Dead zones can be overcome by connecting a long launch cable to the otdr.

The better of the two to select is loss dead zone as this will meet both. Without a launch cable the otdr cannot see the beginning of the cable under test since the test pulse overloads the otdr making it impossible to see anything near the otdr dead zone nor can it see the first connector on the fiber. It allows the otdr to settle down properly and gives you a chance to see the condition of the initial connector on the cable plant.