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O

OPAQUE

Those substances that do not transmit (pass) any light rays; that is, the light rays are either absorbed or reflected [10].


OPEN CIRCUIT

(1) The condition of an electrical circuit caused by the breaking of continuity of one or more conductors of the circuit; usually an undesired condition. (2) A circuit that does not provide a complete path for the flow of current [1].


OPEN-ENDED LINE

A transmission fine that has a terminating impedance that is infinitely large [10].

OPERATIONAL AMPLIFIER

An amplifier designed to perform computing or transfer operations and that has the following characteristics: (1) very high gain, (2) very high input impedance,
and (3) very low output impedance [8].


OPTICAL COUPLER

A coupler composed of an LED and a photodiode and contained in a light-
conducting medium. Suitable for frequencies in the low-megahertz range [7].


OPTIMUM WORKING FREQUENCY

The most practical operating frequency that can be used with the least amount of problems and is roughly 85 percent of the maximum usable frequency [10].


OPTOELECTRONIC DEVICES

Devices that either produce or use light in their operation [7].

OR GATE

A gate that performs the logic OR function. It produces an output 1 whenever any or all of its inputs is/are 1 [13].


ORDER-WIRE CIRCUIT

A circuit between operators used for operations control and coordination [17].

ORGANIZATIONAL-LEVEL MAINTENANCE

Responsibility of the user organization [14].



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