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M-UM010-02 TTK 720 06/18
Also known as “insertion loss” or “fiber sweep” testing, dB loss testing allows the technician to validate
that all fiber pairs are in working condition. Saving of dB loss test results may be required for closeout
packages. This section explains the necessary steps for testing fiber.
dB Loss Testing
4
4a - Connect Test Jumpers for Referencing
The equipment must be referenced before testing begins. Plug the AC 523 into the DLS 355
and VIS 300C OPM port. Connect the paired LC end of the AC 523 jumper into the AC 4500
loopback as shown below. Turn the DLS 355 on and choose an appropriate wavelength. For SM
fiber testing, 1310 and 1550 wavelengths are most common. Consult your build documentation
to determine which wavelength to use. This guide will show the use of the 1550 wavelength.