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Modulation

Modulation is when the signal is carried by an electronic or optical signal carrier. It is used to impress data, image, voice, etc on to a carrier wave for transmission. The form of modulation can think of blanket waving pass information to an certain area. It is used for most of radio get or pass the signal and information in the air. The common modulation are amplitude modulation, frequency modulation, and phase modulation. Amplitude modulation (AM), in which the voltage applied to the carrier is varied over time. Frequency modulation (FM), the frequency of the carrier of FM is varied in small but meaningful amounts. Phase modulation (PM) contain natural flow of the alternating current waveform.

Demodulation
Demodulation separates the original signal from the modulated carrier. A demodulator is an electronic circuit that used to produce a signal to alter and recover the modulated carrier wave. It is common used in connection with radio receivers, but many other systems use other different kinds of demodulators.

Bandwidth

Bandwidth is a term of computer networks. It transfer amount of data and information that can be carried from one point to another. It is usually given period of time (a second) to pass data in bits per second (bps).

TCP/IP

Computer use hardware-addresses to identify TCP/IP of each other's location. On worldwide network, the information are come from other computer. It makes it easier to find the resources over the internet. Every computer has its own IP address. It usually depend on where you are located. TCP/IP has its computer rules to cooperating computers of sharing information on internet works. The internet protocol controls where do you send your data to and where the data come from. There are also some program can hide your computer IP for your privacy.

Node

Node is basically anything that can connect to the computer network. I can be your computer, PDA's, smart phones, fax, or other network implements. Each node has its own IP address.

Client
A client is user that requesting program in a client/server. The user can open a Web browser to interact with the page from servers on the Web. The browser get and return the requests in HTML file.

Server

Server is a computer or device on network that handles the request and sends it back to the clients through the internet. Any user can store amount of files as a file server. The database sever processes the data and organize it in the server. A server basically is the program that manages the resources from the clients.

Network Operating Systems

Network operating systems allow users use computer to share information on multiple computers network. It is a software that runs on server and manages data, users groups, security, applications, and other networking functions.

Network Administrator

A network administrator is a person who maintains hardware and software of the computer network. Net work administrator is usually technical/network staff in an organization who is ensuring the network connectivity working normal.

Input and output / Secondary storage

Input and output

Ergonomic Keyboard

An ergonomic keyboard is an input device that is special designed for end-user to type easily and minimize muscle strain. It's a single keyboard splits into two areas allow right and laft hands to type at a different angle. Ergonomic keyboards are high cost and it is not a common use by people because people nowadays are more get used to the straight keyboard.

Ink-jet Printer

Inkjet printers are the most widely used by people because inkjet printers are reliable, quiet, and the price is affortable to regular users. It sprays ink onto paper within high speed places extreme small droplets of ink to create image or text. The dots are usually between 50 and 60 microns in diameter which is tinier than normal human hair.

-Laser Printer

Laser pinter uses laser beam to produce images with excellent letter. It is more expensive than ink-jet printer. The laser unit fires the light reflect the mirror charge the photoreceptor drum to draw image on the paper. But unfortunately most of the laser printer only print out monochrome text and image.

-Magnetic-ink character

Magnetic-in is the technology that used to type and print out the text on the paper. Nowday it is still been used by the banking, printing checks.

-Optical-character recognition

Optical character recognition (OCR) is a wide used implement that scans image, handwritings, textbook, graph paper, and change it to the form that computer can read and change it. OCR can edit the text and copy free artifacts.

-Optical-Mark recognition

Optical-mark recognition is type of technology that can read the mark on the marking paper and recognize the locations those dots. It can only recognize 2B pencil mark. It extract the intended data from marked fields. It frequently used for test and examinations.

Secondary storage

-Disk caching

Disk caching improve the speed for disk to read or write on to a hard disk. I can be seen in the hard disk. The purpose is to increase the reading process when the operating system performs features of programs.

-File Compression

File Compression compresses data into smaller size and includes varies of files and documents. There are some widely use program can compress data like ZIP, RAR, and other program.

-File Decompression

When you use program to compress files then you also can use its function to decompress the compression.

-Internet hard drive

-Optical Disc Drive

-Solid-state storage