It is recommended that a survey of the cable route should be conducted. Manholes and ducts should be inspected to determine the optimum splice point locations and duct assignments. DWDM/CWDM is like a two-edged sword. For a small fee (the procurement of the modules and the circulator) you can split/splice one physical fibre optic cable into multiple pairs. Traditional methods can slow down your operations and increase the. Network Expansion: When expanding a network, you may need to split existing fiber lines to connect additional devices or locations. Signal Distribution: Distributing a signal to. Many installations involve splitting the fibers in a cable or dropping a small fiber count cable from a large backbone cable. Backbone cables of 144-288 fibers are common and larger ones are becoming more common too.