Specifications

Chapter 1 Introduction Installation and Operation Manual
1-4 Functional Description FOM-E3, FOM-T3 Ver. 1.0
1.2 Physical Description
Figure 1-2 illustrates the FOM-E3 and FOM-T3 fiber optic modems.
Figure 1-2. FOM-E3 and FOM-T3, 3D View
The front panels of FOM-E3 and FOM-T3 contain LEDs, which display the power,
E3/T3 electrical and fiber optic interface status. The front panel also includes the
TEST slide switch for the local and remote loopbacks activation. For details, refer
to
Chapter 3.
The rear panels include the power connector (AC or DC), an E3/T3 electrical
interface connectors, fiber optic connectors, and alarm relay connector. The
FOM-E3 and FOM-T3 rear panels are described in greater detail in
Chapter 2 .
1.3 Functional Description
This section provides a functional description ( Figure 1-3 ) of FOM-E3 and FOM-T3
in the form of block diagrams.
In
Out
E3/T3
Electrical Interface
Fiber Optic
Interface
CDP/NRZ
Encoder/Decoder
CDP to Fiber Optic
Tx
Fiber Optic to CDP
Rx
Figure 1-3. FOM-E3, FOM-T3 Block Diagram
FOM-E3 and FOM-T3 have the following signal processing modules:
• Signal conversion
• Data/clock recovery
• Data transfer.