F I M - 1 0 8 F I B E R I N T E R F A C E
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ONE-FIBER AND TWO-FIBER CONFIGURATIONS
FIM-108D Two-Fiber Configuration
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.
FIM-108M and FIM-108S One-Fiber Configurations
In a one-fiber system, the two FIM-108 units are
not identical
and are configured
before shipment. They must be used as a pair. The units are connected by a single
fiber that is wavelength division multiplexed (WDM). One unit transmits from
the “A” ST connector at a wavelength of 1300 nm and also receives at 1550 nm
on the same connector. The other unit transmits from the “A” ST connector at
1550 nm and similarly receives at 1300 nm on the same connector.
The two FIM-108 units in the one-fiber versions are not identical, so if a
replacement unit is needed, the unit type must be specified.
Figure 4 illustrates the three configurations of the Clear-Com FIM-108 System.
Figure 3: Possible Optical Configurations
1300 nm
1300 nm
Unit A
Unit B
Unit A
Unit B
1300 nm
1550 nm
TX 1300 nm
RX 1300 nm
TX 1300 nm
RX 1550 nm
RX 1300 nm
TX 1550 nm
RX 1300 nm
TX 1300 nm
FIM-108D TWO-FIBER SYSTEM
FIM-108M ONE-FIBER SYSTEM (MULTIMODE)
Unit A
Unit B
1300 nm
1550 nm
TX 1300 nm
RX 1550 nm
RX 1300 nm
TX 1550 nm
FIM-108S ONE-FIBER SYSTEM (SINGLE MODE)