Customers install a tube cable and make connections of individual tubes to create pathways. Fiber units, available in single-mode and multimode and in various fiber counts, are then blown in as needed. If the type of fiber or the quantity of fiber needed at a particular location subsequently changes, the fiber unit can be removed and a new unit blown in. The removed fiber unit can be reused elsewhere. New pathways can be added to extend the network using simple push fit connectors, reducing the cost of network expansion. If additional capacity is needed later, fiber units can be blown in when and where needed at a much lower cost than installing a new fiber cable.
http://goliath.ecnext.com/coms2/summary_0199-231669_ITM
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