To assign cables between the objects in a fiber link, select the dashes (- - -) at the position where you wish to add the cable and press the Edit Cable... button. This opens the Assign Cable dialog. See Managing physical cables for more information
You can also edit dB loss for the fiber link. Specify the transmit and receive attenuation (dB loss) for the fiber link; these fields are stored and can be compared with subsequent dB loss measurements.