Specifications

Chapter 1 Introduction Installation and Operation Manual
1-2 Overview FOM-E3, FOM-T3 Ver. 1.0
Fiber Optic Interface
FOM-E3 and FOM-T3 supports different fiber optic interfaces, as detailed in
Table 1-1.
Power Supply
• AC source: 100 to 240 VAC
• DC source: 40 to 72 VDC
Application
In the application illustrated in Figure 1-1 , each FOM-E3 or FOM-T3 receives E3 or
T3 signals, which are equalized to overcome electrical link distortion. FOM-E3 or
FOM-T3 then converts the E3 or T3 signals into an optical signal. The optical
signal is coupled to the fiber optic media and transmitted via the optical link to
the remote unit. A high sensitivity pre-amplifier and an AGC (Automatic Gain
Control) circuit enable the remote unit to receive the optical signal. The output of
the receiver is then applied to the clock recovery and data regeneration circuit,
which in turn applies it to the electrical interface driving circuit.
Router Router FOM-E3/FOM-T3FOM-E3/FOM-T3
Fiber Optic Link
Up to 110 km (68.35 miles)
Figure 1-1. FOM-E3, FOM-T3, Typical Application
Features
• Extends the range of E3, T3 signals over fiber optic cable up to 110 km
(68.35 miles)
• Transparent to E3, T3 signals
• Conforms with all relevant ITU series standards
• Supports multimode- or single-mode fiber
• Extends distances with laser diode option, including long haul and WDM laser
option.
FOM-E3 and FOM-T3 also feature:
• LED status indicators
• V.54 loopbacks activated from the front panel
• An alarm relay port for reporting the status of the system.