Select 1. System Introduction 2. System Configuration 3. System Specification 4. Example of System Operation 1. System Introduction The system is an In-Building Optic Distributor, which can accommodate subscribers in dark spots. The system can be used to transmit signals received from a separate repeater or BTS to anywhere in the building using optic lines and improve radio access for the telecommunication environment. For buildings with a large number of subscribers, the system is linked with BTS to generate sufficient capacity. When servicing buildings with relatively fewer subscribers, the system can extend the service area by linking itself with a separate repeater or two-way amplifier and receive signals from outside BTS.