A good fusion splice typically has an insertion loss of less than 0. Testing ensures your splice meets performance standards and that there are no weak points or hidden issues. The Contractor tasked to perform testing or splicing on any fiber optic cable will follow these testing standards to fulfill their contractual obligations. 1dB loss that will last the life of the cable plant. But what happens when you need to join two cables to extend a network or repair a break? You can't just twist them together., using a 6-port instead of a 4-port) Correct material codes for primary items such as cables, cabinets, and poles Location changes for terminals, handholes, flowerpots/sod boxes, or FDH placement Handhole size adjustments and.