RAD Data comm E1 User Manual

FOM-E1/T1 Installation and Operation Manual 

Chapter 1  Introduction 

 

Functional Description 

1-3 

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. 

 shows a 3D view of FOM-E1/T1. 

 

The front panel indicates modem status. The front panel indicators and controls 
are described in C

  

The rear panel connectors and internal jumpers are described in C

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. 

 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

 

FOM-E1/T1 comprises the following signal processing stages: 
•  Signal conversion 
•  Data/clock recovery 
•  Data transfer.