INPUT. The driving force applied to a circuit. Input can also be terminals or other connections where this force Is applied.
INTEGRATOR CIRCUIT. This circuit is used to separate two frequencies or functions.
MODULATION. The process of changing the amplitude, frequency, phase of a signal in such a way that it will convey information.
NEGATIVE. A point from which electrons will flow toward a positive point in the circuit.
OHM. The unit of measurement for resistance in a circuit.
OSCILLATOR. A device which produces alternating voltage and current when direct current is applied. The frequency is determined
by components in the circuit.
OUTPUT. The driving force delivered by a device or circuit. Output can also be terminals or other connections where this force is
POLARITY. The condition which determines the direction of current flow in a circuit. Charges are either positive or negative.
PRECEDENCE. Having importance. There are four levels of precedence which determine which call is more important than another
PREEMPTION. A higher precedence call interrupting a lower precedence call.
RESISTANCE. The property of a conductor which causes it to oppose the flow of current.
RESISTOR. A component which opposes the flow of current in a circuit.
SIDETONE. In a telephone receiver, the system which allows you to hear your own voice.
SIGNAL. A means by which information is passed on over a communication system.
SUBSCRIBER. Someone who has been assigned a telephone set and a number.
SWITCHING FACILITY. A central location able to connect many telephone sets together by their assigned telephone numbers.
THRESHOLD. A minimum level needed to cause a response.
TRANSFORMER. A device which consists of primary and secondary windings used to either decrease or increase current.
TONE. A sound wave that is In the audible range.
VOLTAGE. Electromotive force or pressure which causes current to flow.