Specifications

Installation and Operation Manual Chapter 1 Introduction
FOM-E3, FOM-T3 Ver. 1.0 Technical Specifications 1-5
Signal Conversion
An infrared light emitting diode or laser transmitter converts the electrical NRZ
signal into an optical CDP signal. At the opposite end of the fiber, the optical
signal is converted back into an electrical signal and amplified to the required
level.
Data/Clock Recovery
A phase locked loop (PLL) circuit recovers data and clocking from the signal.
FOM-E3 and FOM-T3 provide internal selection for the following electrical
interfaces:
• E3, 75Ω unbalanced, HDB3 line coding
• T3, 75Ω balanced, B3ZS line coding.
Data Transfer
The optical signal is linked to the fiber-optic media and transmitted to the remote
unit. A high-sensitivity pre-amplifier and an automatic gain control (AGC) circuit
enable the remote unit to receive the optical signal. The output of the receiver is
applied to the clock recovery circuit and the data regeneration circuit, which in
turn apply it to the electrical interface driving circuit.
1.4 Technical Specifications
E3/T3 Electrical
Interface
Transmission Rates
• E3: 34.368 Mbps
• T3: 44.736 Mbps
Impedance 75Ω, unbalanced
Zero Suppression
• E3: HDB3
• T3: B3ZS
Connectors Two BNC connectors
Applicable Standard ITU-T G.703
Fiber Optic
Interface
Operating
Wavelength
850 nm, 1300 nm, or 1550 nm (see Table 1-1)
Line Coding CDP
Connectors ST, FC, SC, or SC-APC for SF3 interface
Output Power See Table 1-1
Receiver Sensitivity See Table 1-1