Question:  I'm looking for information regarding the FIM-108 Fiber Interface.  Is a user manual available for this device?
Answer:  The FIM-108 interface allows the user to connect Clear-Com intercom stations or interfaces to the central matrix using fiber-optic cables at distances of up to 12 miles (20 km). For added convenience BNC connectors are also provided, so that the user can connect FIM-108 units with coaxial cables at distances of up to 1,000 feet (300 meters).
The system consists of one FIM-108 unit at the matrix-frame end and another FIM-108 unit at the matrix-station end. Connecting the pair of interfaces with fiber or coaxial cable, rather than with the standard 4-wire twisted copper, gives the user advantages such as increased security from electromagnetic and RF interference, flexibility in equipment placement, ease of maintenance, and often, reduced cost.
In a standard two-fiber system, identical FIM-108D units are used at each location. The units both transmit at 300 nm on ST connector A and receive the 300 nm signal on ST connector B. They are connected by the two fibers so that the optical output of each box is connected to the optical input of the other. In both one- and two-fiber systems, the input of channel 1 on one unit becomes the ouput of channel 1 on the other unit, and vice versa. The two FIM-108 units in the two-fiber version are identical, so the units are interchangeable.








The FIM-108 user manual is attached below.