Download - Data Transmission Mode
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Data Communication
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WHAT IS DATA COMMUNICATION?
??
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• DATA COMMUNICATION is exchange of information between two devices through some medium (wired or wireless). This includes transfer of data, method of transfer and preservation of data during transfer process.
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ELEMENTS OF COMMUNICATION SYSTEM
Humanmessage
message for another
person
TransmitterCommunication
channel or medium
Receiver
Noise
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Transmitter: Designed to convert the information to electrical signal.
Communication Channel or Medium: Medium by means of which the electronic signal is sent.
Receiver: The receiver accept the signal from the communication channel, decodes it, and produces the
original information.THE PORTS OF DATA COMMUNICATION:
1) Message: The information which is to be sent to the receiver.
2) Sender: It refers to device that sends the message.3) Receiver: It refers to the device that receives the
message
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PROTOCOL
A set of Rules.To be followed by both the sender and the receiver.
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SENDERRECEIVER
FOR EXAMPLE
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DATA TRANSMISSION
modeTHREE MODES OF DATA TRANSMISSION:
SIMPLEX
HALF DUPLEX
FULL DUPLEX
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SIMPLEX
•Signal travels in one direction only.•eg. television
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HALF DUPLEX• Receving and transmitting data cannot be done at the same time.• Eg. Walkie talkie
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FULL DUPLEX
• Allows to transmit and receive data at the same time.• Eg. Telephone
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BANDWIDTH•Maximum amount of information that can be transferred over any communication medium.
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THREE CATEGORIES OF BANDWIDTH
• Capacity upto 64kbps
Narrow band
• Capacity Above 1.5mbps and less than 45mbps
Wideband
• Capacity Equal to 45 mbps
Broad band
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MODEMS
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Modems helps to transmit data from one computer to other through telephone lines.
The Modem transmits data from senders computer to receivers computer by converting digital signal into analog signal and vice- versa.
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FAX MODEM
CABLE MODEM
TYPES OF MODEMS
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FAX MODEM
FAX modem is used to transmit data, pictures and another files through telephone lines from one computer to other or from one computer to a fax machine.
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Cable modem
CABLE MODEM is a technology that enables home computer users to connect to internet through cable TV connections with high speed than regular connection.
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DSL TECHNOLOGY• It is a modem technology access over
ordinary copper telephone line from homes and business
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DSL SERVICE• It is a high speed
internet• Several types such as • ADSL,HDSL,SDSL,VDSL,e
tc
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Wireless Networks
• Introduction• Types• Advantages and disadvantages
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Introduction
Wireless network refers to any type of computer network that utilizes some form of wireless network connection.
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Types• Wireless PAN• Wireless LAN• Wireless MAN• Wireless WAN• Wireless SAN
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Advantages And Disadvantages
Advantages• Flexibility
(wirelessness)• Ease of use• Planning• Place devices• Durability• Prices
Disadvantages• Ethernet.• Compatibility issues
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TH
AN
K
YO
U