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Chapter 1:INTRODUCTION TO NETWORK (PART 3) (iii) Electronic communication…
Chapter 1:INTRODUCTION TO NETWORK (PART 3)
I)communication device (sender/receiver)
•The sender and the receiver is the device that sends the data/message
•Example: computer and telephone.
ii) Data elements-message
*Is the information data to be communicate
*Example:text, number, video, picture, and audio.
iii) Electronic communication method
~Email
~ private message
~Online chat
~Forum
~SMS
-Instant message
iv) Transmission medium (path)
for a message travels from sender to receiver
Example: radio waves, fiber-optic cable
Data transmission
1.Analog and digital signaling
•Analog signals
2) Continous signal
3) Example:human voice
1) Cannot perform high-quality data transmission
4) No security
•Digital signal
1) Discrete signal
2) Example: data stored in memory
3) Making high-quality data transmission
4) Able to encrypt
Data modulation
•used to modify analog signals to make suitable for carrying data over a communications data
•convert data from analog to digital or vice versa
Simplex, half duplex, full duplex
•Simplex (keyboard cs CPU)
a) Data flow only in one direction
b) Example: watching television and fire alarms
•Half duplex (printer cs computer)
b) Data can flow in either direction
c) Example:walkie talkie and fax machine
a) Data can flow in both directions at the same time
Multiplexing
•Allows multiple signals
•Logically separated into multiple smaller channels
Point to point
transmission
• Transmission between two node
•Example cable, telephone
6.Broadcast
transmission
•Transmission involving one transmitter and multiple receivers
7.Troughtput
•data can be sent per unit of
across a network channel
8.Bandwidth
•Data carrying capacity of a
network
Transmission Flaws
¤ is any defect that can affect the
quality of data signal
¤ most common flaws is:
Noise
Attenuation
Latency