Specifications

FOM-E3/ETH, FOM-T3/ETH Ver. 1.0 Overview 1-1
Chapter 1
Introduction
1.1 Overview
FOM-E3/ETH and FOM-T3/ETH are fiber optic modems for transmission of
10BaseT or 100BaseT signals over E3/T3 services via multimode or single mode
fiber optic media.
Product Options
Model Options
• FOM-E3/ETH: 10/100BaseT over E3 fiber optic services
• FOM-T3/ETH: 10/100BaseT over T3 fiber optic services.
Power Options
• AC power supply: 100 to 240 VAC
• DC power supply: 20 to 72 VDC.
Application
Figure 1-1 shows FOM-E3/ETH and FOM-T3/ETH extending 10/BaseT traffic over a
fiber optic link. The FOM-E3 or FOM-T3 modem provides E3/T3 electrical access to
SDH/SONET. The RIC-E3/ETH or RIC-T3/ETH device converts the E3/T3 signal back
to the 10/100BaseT traffic at the central office or POP.
RIC-E3/ETH or
RIC-T3/ETH
FOM-E3 or FOM-T3 FOM-E3/ETH or
FOM-T3/ETH
SDH/SONET
Router
E3/T310/100BT E3/T3
Fiber Link
Up to 110 km (68.3 miles)
Central Office/POP
Figure 1-1. 10/100BaseT Service Extension over E3/T3 Fiber Link