RAD Data comm FOMi-T1 Manual de usuario descargar pdf (Pagina 2)

FOMi-40

Fiber Optic Modem with Remote Management

Master and slave versions of FOMi-40 are

available. The master standalone version

features a front panel LCD. The slave unit

has a blank front panel with a 20-pin

connector that connects to a Portable

Control Unit (PCU). The PCU is used to

monitor and change parameters of the

slave or master modem and monitor

system alarms.

The modem uses an inband management

channel for controlling and monitoring the

remote unit. Data and management are

simultaneously transmitted over the same

fiber link, without interference.

Menu-driven software, accessed from the

front panel, allows the user to monitor

and control the following parameters on

local and remote modems:

• Data rate (when set to internal or

receive mode)

• Clock source

• Loop activation

• Internal BER tester activation

• LED status of local and remote units

• Local and remote unit settings

• Real-time alert of fault conditions.

FOMi-40 supports the following three

timing modes:

• Internal, from a built-in oscillator

• External, from the attached DTE

• Receive, from the signal received over

the line.

In the external mode setting, FOMi-40

automatically detects the clock rate

coming from the digital interface and sets

the remote unit to work at the same rate.

When the data rate of the external clock

changes, both local and remote units

automatically synchronize to the new rate.

FOMi-40 utilizes a phase locked loop (PLL)

circuit to recover jitter-free data and

clocking from the optical signal.

FOMi-40 is designed to operate with

several grades and sizes of fiber optic

cable and offers the following optical

interfaces:

• 850 nm LED/VCSEL for multimode

fibers

• 1310 nm laser for single-mode fibers

• 1550 nm laser for single-mode fibers.

Figure 1. Point-to-Point Application

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