Computers in Accounting Test - 19

A parabolic dish antenna is a Undirectional antenna.

A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. ... They are also used in radio telescopes.

A high-gain antenna (HGA) is a directional antenna with a focused, narrow radiowave beam width. This narrow beam width allows more precise targeting of the radio signals. ... For long and medium wavelength frequencies, tower arrays are used in most cases as directional antennas.

Dipole antennas are said to have a gain of 2.14 dBi, which is in comparison to an isotropic antenna. The higher the gain of the antennas, the smaller the vertical beamwidth is. Imagine the radiation pattern of an isotropic antenna as a balloon, which extends from the antenna equally in all directions.

A satellite dish is a dish-shaped type of parabolic antenna designed to receive or transmit information by radio waves to or from a communication satellite. The term most commonly means a dish used by consumers to receive direct-broadcast satellite television from a direct broadcast satellite in geostationary orbit.

The elements of computer processing system are:-

Hardware: The physical components of a computer constitute its Hardware. These include keyboard, mouse, monitor and processor. Hardware consists of input devices and output devices that make a complete computer system.

Data: Data that the computer takes in and processes data can be of various types such as numbers, texts, images etc.

Users: Human or other devices or programs that operates the computer with instructions.

Procedures: Computer processes data to generate information or data for another another process.

The Physical layer changes bits into electromagnetic signal.

Physical layer is the only layer of OSI network model which actually deals with the physical connectivity of two different stations. This layer defines the hardware equipment, cabling, wiring, frequencies, pulses used to represent binary signals etc. Physical layer provides its services to Data-link layer.

Located at the lowest layer of the Open Systems Interconnection (OSI) communications model, the physical layer's function is to transport data using electrical, mechanical or procedural interfaces.

The physical layer is the first layer of the Open System Interconnection Model (OSI Model). The physical layer deals with bit-level transmission between different devices and supports electrical or mechanical interfaces connecting to the physical medium for synchronized communication.

The following are the OSI protocols used in the seven layers of the OSI Model: Layer 1, the Physical Layer: This layer deals with the hardware of networks such as cabling. The major protocols used by this layer include Bluetooth, PON, OTN, DSL, IEEE.802.11, IEEE.802.3, L431 and TIA 449.