TOPICDATA

COMMUNICATION AND

COMMUNICATION MEDIA

DATAInformation in raw or unrecognized form(such as alphabets, numbers or symbols) that refers to, or present, conditions, ideas or objects.

COMMUNICATIONCommunication is sending and receiving information between two or more people.The person sending the message is reffered to a the sender.While the person receiving the information is called receiver.

The process of transferring data from one location to another location is called data communication. In this process data is transmitted from on location to another by using transmission media.

DATA COMMUNICATION

MESSAGE SENDER RECIEVER MEDIUM / COMMUNICATION CHANNEL ENCODER AND DECODER

BASICS COMPONENTS OF DATA COMMUNICATION

MESSAGE The message is the data or information to be

communicated . It may consists of text, numbers ,pictures ,sounds ,video or any a combination of these.

SENDER Sender is a device that sends message. The message

may consists of txt , numbers ,pictures etc. It is also called SOURCE or TRANSMITTER. Computer is used as sender in data communication system.

RECEIVER Receiver is a device that receives message. It is also

called SINK. The receiver can be computer , printer or another computer related device. The receiver must be capable of accepting the message.

COMPONENTS

MEDIUM Medium is the physical path that connects sender and receiver. It is

used to transmit data. The medium can be a copper wire , a fiber optic cable , microwaves etc .

ENCODER The encoder is a device that converts digital signal in a form that can

pass through a transmission medium.

DECODER The decoder is a device that convert the encoded signals in to digital

form. The receiver can understand the digital form of message. Sender and receiver cannot communicate successfully without encoder and decoder

Communication media refers to the means of delivering and receiving data or information. In telecommunication this means are trans mission and storage tools or channels for data storage and transmission.

TYPES OF COMMUNICTATION MEDIA

Wired communication media Wireless communication media

COMMUNICATION MEDIA

It refers to the transmission of data over a wire based communication technology.

EXAMPLES It includes telephone networks, cable

telecom or internet access and fiber optic communication.

WIRED COMUNICATION MEDIA

COAXIAL CABLE TWISTED PAIR CABLE FIBRE OPTIC CABLE

WIRED COMMUNICATION TYPES

They are used by cable TV and is common for data communication.APPLICATIONCoaxial cable is used as transmission line for radio frequency.CONNECTORIt is connected with the two.TRANSMISSION SPEEDIts transmission speed is 1 Giga bits per second (gbps).

COAXIAL CABLE

It is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of cancelling out electromagnetic interference from external sources.CONNECTORBlue wires attach with PC’s.APPLICATIONUsed in star topology and telephone system. TRANSMISSION SPEEDIts speed is 1 Giga bits per second (1gbps) in 100 meter.

TWISTED PAIR CABLE

Air technology that uses glass threads to transmit data. It consists of a bundle of glass threads each of which capable of transmitting messages modulated onto light waves.APPLICATION Internal service provider using this.TRANSMISSION SPEED Its speed is trillion of bits per second.

FIBER OPTIC CABLE

It is the transfer of information between two or more points, that are not connected by electrical conductor.

EXAMPLE They are used in radio, few meters for

television, including two ways radio, cellular telephones etc.

WIRELESS COMMUNICATION MEDIA

Microwaves Satellite Wi-Fi Bluetooth

WIRELESS COMMUNICATION TYPES

Microwaves radiations has lower frequency and longer wave lengths than visible light.TRANSMISSION SPEEDIts ranging from one meter to one million meter with frequencies between 300MH3 (100cm) and 300GH3 (0.1m).

It is an artificial satellite that relays and amplifies radio telecommunication signals via transponderEXAMPLEGeostationary orbits is useful for it Medium, Air or Vacuum

FREQUENCYL, C, Ku, KaHigh frequency

SATELLITE

It is a local area wireless computing network technology that allows electronic devices to connect to the network.TRANSMISSION SPEEDIts speed is 2.4 gigahertz (120m)UHF and 5 gigahertz (6cm) 20 metersUSES Personal computers, video game consoles, smart phones, digital camera, tablet computer and digital audio player.

WI-FI

It is a wireless technology for exchanging data and short distance.

APPLICATIONFor controls where infrared was used.FREQUENCYBetween 2042 and 2480 MH3 or 2400 and 2483.5 MH3 small and large frequency.

COMMUNICATION AND CONNECTIONIt can communicate with a maximum of seven devices (computer network using Bluetooth technology).