amount of db loss allowed in single mode cable
- A total fiber loss calculation is made based on the distance x the loss factor. Distance in this case the total length of the fiber cable, not just the map distance. â¢ Type of fiber â Most single mode fibers have a loss factor of between 0.25 (@ 1550nm) and 0.35 (@ 1310nm) dB/km. Multimode fibers have a loss factor of about 2.5 (@. 850nm) and 0.8 (@ 1300nm) dB/km.