Specifications

Overview 1-1
Chapter 1
Introduction
This chapter:
•
Describes FOMi-E1/T1, the versions available, features and options.
•
Briefly describes the Front Panel.
•
Provides a basic functional description of FOMi-E1/T1 and a short
description of some of the main operations and options.
•
Details FOMi-E1/T1 technical specifications.
1.1 Overview
General
Description
FOMi-E1/T1 is a fiber-optic modem for transmission of E1 (2048 Mbps)
and T1 (1544 Mbps) signals over multimode or single-mode fiber-optic
media. The unit is transparent to framing, and can transmit data using any
framing pattern with HDB3 E1 or B8ZS T1 coded signals.
FOMi-E1/T1 supports both E1 and T1 in a single unit. The E1 interface fully
complies with the applicable ITU standards and uses HDB3 line coding.
The T1 interface fully complies with requirements of ITU G.703 and G.824
standards and uses B8ZS line coding.
Application
In the application illustrated in Figure 1-1, each FOMi-E1/T1 receives E1 or
T1 signals, which are equalized in order to overcome electrical link
distortion. FOMi-E1/T1 then converts the E1 or T1 signals into an optical
signal.
The optical signal is linked 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 applied to the clock recovery
and the data re-generation circuit, which in turn applies it to the electrical
interface driving circuit.
FOMi-E1T1
DACS
FOMi-E1T1
Fiber Optic
T1 or E1
Coax
T1 or E1
Coax
PABX
Figure 1-1 Application Diagram