-Computer communication is defined as any human communication that occurs through the use of two or more electronic devices.(transfer ,receive ,instructions and information).
-Uses of computer application : blogs ,chat rooms , E-mail ,Fax, internet ,web ,web 20 etc....With wireless users can send and receive messages.
-Text messaging is an electronic communication sent and received by cellular phone or pc or any device.
-Picture messaging : can be use for sending pictures and sounds files.
-Video messaging : Communicating visually with another person via computer. Video chat may refer to video calling or video messaging. For example, Facebook's Skype .
-Wireless instant messaging: is a type of online chat which offers real-time text transmission over the Internet.
-Wireless internet access point : is the one can be use in many public location ,or school ,or home etc... for many people.
-A cyber café is a place which provides Internet access to the public, usually for a fee.
-Global Positioning System is a system of satellites, computers, and receivers that is able to determine the latitude and longitude of a receiver on Earth by calculating the time difference for signals from different satellites to reach the receiver.
-Groupware is a Software that supports multiple users working on related tasks in local and remote networks.
-Voice Mail is a computer-based system that allows users and subscribers to exchange personal voice message, to select and deliver voice information; and to process transactions relating to individuals, organizations, products and services, using an ordinary telephone.
-Many programs provide a means to collaborate , or work online , with users connected to a server .Collaboration software is an application software designed to help people involved in a common task to achieve their goals.(online meeting ,web conferences, documents management system).
- Web
services enable programmers to create applications that communicate with other
remote computers over the Internet.
- Mashup :is a mixture of content or elements. For example, an application that was built from routines from multiple sources or a Web site that combines content and/or scripts from multiple sources is said to be a mashup.
-Network is a set of computers connected together for the purpose of sharing resources.
-Advantages of a network: sharing software , sharing hardware, transferring funds ,facilitating communication ,sharing information and data.
-Local area network is a computer network that spans a relatively small area.
-Wireless LAN is a LAN that uses no physical wires .
-A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network (LAN) but smaller than the area covered by a wide area network (WAN).
-Wide area network is a network that covers a large geographical area.
-Peer-to-peer (P2P) computing or networking is a distributed application architecture that partitions tasks or work loads between peers. Users access
each other’s hard disks and exchange files directly over the Internet.
-Network topology refers
to the layout of the computers and devices in a communications network, and have three parts which: star network , bus network , ring network.
-Intranet is an intranet network that use internet technologies while extranet allows customers to access part of its intranet.
-Networks communication standards : WIFI , UWB, RFID , Bluetooth etc...
-Ethernet is a system for connecting a number of computer systems to form a local area network, with protocols to control the passing of information and to avoid simultaneous transmission by two or more .
-A token ring network is a local area network (LAN) in which all computers are connected in a ring or star topology and pass one or more logical tokens from host to host.
-TCP/IP is the language a computer uses to access the Internet.
-WI-FI identifies any network based on the 802.11 standard that facilitates wireless communication
.
-
Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data
-UWB specifies how two UWB devices use short-range radio waves to communicate at high .
- IrDA transmits data wirelessly via infrared (IR) light waves.
- RFID uses radio signals to communicate with a tag placed in or attached to an object, animal, or person.
-WIMAX 802.12: .develops by IEEE
.towers can cover 30 mile radius
.two types are fixed wireless and mobile wireless
.provides wireless
-Wireless application protocol: .E-mail
.web
.chats rooms etc...
- Communication software consists of programs that:
.help users to establish connection to others computer or network
.manage the transmission of data ,instruction ,and information
.provides an interface for users to communicate with one another.
-
The public switched telephone network (PSTN) is the worldwide telephone system
.
Dial-up lines ,dedicated line, ISDN line ,DSL, FTTP, T-carrier ,ATM.
-Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines rather than a conventional voice band modem can provide.
-Communication device is an umbrella term for hardware that transmits voice, video or text. It can refer to virtually any computing, phone or network device.
-
A dial-up modem converts signals between analog and digital
.
-A digital modem send and receive data and information to and a digital line (DSL modem ,cable modem).
-A
wireless modem uses the cell phone network to connect to
the Internet wirelessly from a notebook computer.
-A network interface controller (NIC, also known as a network interface card, network adapter, LAN adapter or physical network interface, and by similar terms) is a computer hardware component that connects a computer to a computer network.
-A router is a networking device that forwards data packets between computer networks.
-Home networks provides computers with :connection ,high speed internet, access files and programs ,connect game and play in mode of multiplayer ,share peripherals ,subscribe to and VOIP.
-Types of wired home network: Ethernet ,Power line cable ,phone line.
-
The amount of data that can travel over a communications channel sometimes is called the bandwidth.
-Latency is the time it takes a signal to travel from one location to another on a network.
-Transmission data carries one or more signals.
-Broadband media transmit multiple signals simultaneously.
-radio communication based on a network of transmitters each serving a small area known as a cell: cellular radio.
- Microwave is a radio signal in the frequency range from 300 MHz to 300 GHz or from 1 to 300 GHz, depending on the rating system.
-In a communications context, a satellite is a specialized wireless receiver/transmitter that is launched by a rocket and placed in orbit around the earth.
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