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CHAPTER 4
THEORY OF OPERATION
4.1
INTRODUCTION
The second generation VERSITRON fiber optic modem and interface extender products, the
FOM II Series, are designed to operate with 12 VDC input power. The Model AC300WR
Redundant Power Supply/System Monitor has been developed to provide adequate power for
up to
20 FOM II modems in a Model HF-20A chassis.
In addition, the Model AC300WR has circuitry to monitor the HF-20A alarm bus. The unit
takes an input of 115 or 230 volts AC and transforms it into a 12 volt DC output with 50Amp
current (Total combined current of the unit). The Model AC300WR consists of shielded AC
filtered inlets, diode rectifiers and three mini fans, and a printed circuit board containing the
LED drivers and alarm circuitry. The unit is enclosed in an aluminum alloy housing.
