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Communications and Networks by Mind Map: Communications
and Networks
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Communications and Networks

Communications

Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information

Uses of Computer Communications

Users can send and receive wireless messages using wireless messaging services

Wireless Internet access points allow people to connect wirelessly to the Internet from home, work, school, and in many public locations

A cybercafé is a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers

A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver’s geographic location

GPS receivers

Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users

Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network

A mashup is a Web application that combines services from two or more sources

Networks

A network is a collection of computers and devices connected together via communications devices and transmission media

Advantages of a network include

Facilitating communications

Sharing hardware

Sharing data and information

Sharing software

Transferring funds

A local area network (LAN) is a network that connects computers and devices in a limited geographical area

A wireless LAN (WLAN) is a LAN that uses no physical wires

A metropolitan area network (MAN) connects LANs in a metropolitan area

A wide area network (WAN) is a network that covers a large geographical area

The design of computers, devices, and media on a network is sometimes called the network architecture

P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet

A network topology refers to the layout of the computers and devices in a communications network

Network Communications Standards

Ethernet

Token ring

TCP/IP

Wi-Fi

Bluetooth

UWB

IrDA

RFID

WAP

Communications Software

Communications software consists of programs that

Help users establish a connection to another computer or network

Manage the transmission of data, instructions,and information

Provide an interface for users to communicate with one another

Communications Over the Telephone Network

The public switched telephone network (PSTN) is the worldwide telephone system

ADSL connections transmit data downstream at a much faster rate than upstream

Communications Devices

A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device

A dial-up modem converts signals between analog and digital

A digital modem sends and receives data and information to and from a digital line

A wireless modem uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device

A network card enables a computer or device to access a network

Available in a variety of styles

Wireless network cards often have an antenna

A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network

A router connects multiple computers or other routers together and transmits data to its correct destination on a network

Many are protected by a hardware firewall

A hub or switch connects several devices in a network together

Home Networks

Types of wired home networks

Ethernet

Powerline cable

Phoneline

Communications Channel

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 media carries one or more signals

Broadband media transmit multiple signals simultaneously

Physical Transmission Media

Wireless Transmission Media

Cellular radio is a form of broadcast radio that is used widely for mobile communications

Microwaves are radio waves that provide a highspeed signal transmission

A communications satellite is a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide area

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