FOM-E1/T1 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-3
1.2 Physical Description FOM-E1/T1 is a compact unit, intended for installation on desktops or shelves. An
optional rack-mount adapter kit enables FOM-E1/T1 installation into a 19-inch
rack. Figure 1-2 shows a 3D view of FOM-E1/T1.
Figure 1-2 FOM-E1/T1 3D View
The front panel indicates modem status. The front panel indicators and controls
are described in Chapter 3.
The rear panel connectors and internal jumpers are described in Chapter 2.
1.3 Functional Description This section describes the functional circuitry of the FOM-E1/T1 fiber optic
modem. FOM-E1/T1 is used for transmission of E1 (2.048 Mbps) and T1
(1.544 Mbps) over multimode or single-mode fiber optic media. The unit is
transparent to framing and can transmit data using any framing pattern with HDB3
or B8ZS coded signals.
Figure 1-3 illustrates the FOM-E1/T1 block diagram.
DTE
Interface
Transmit Clock
Receive Clock
External Clock
CDP
Encoder/
Decoder
CDP to F/O
LED
LED
AGC, Equalizer
Clock Recovery
TD
RD
TC & RC
EXT CLK
PLL
F/O to CDP
Figure 1-3 FOM-E1/T1 Block Diagram
FOM-E1/T1 comprises the following signal processing stages:
• Signal conversion
• Data/clock recovery
• Data transfer.