Analog and Digital Signal transmission

Analog and Digital signals

Analog signals

Analog signals are continuous in nature, that means analog data refers to information that is continuous in nature such as voltage, pressure, etc.

E.g. Analog clock works on continuous data to represent the time.

Digital signals

Digital signals are discrete (discontinuous) in nature that means digital data refers to information that is discontinuous in nature.

E.g. Digital clock works on discreate data to represent the time.

Difference between Analog and Digital signals

Analog signals	Digital signals
An Analog signal is a continuous signal which represents the physical measurement	Digital signals are discrete-time signals generated by digital modulation
Analog signals are denoted by sine waves	Digital signals are denoted by square wave
Analog signal examples are a human voice in the air, analog electronic devices	Digital signal examples are computers, DVDs, and other digital electronic devices
Analog signals are affected by noise	Digital signals are less affected by noise
Analog hardware is not flexible	Digital hardware is flexible
Best suited for audio and video transmission	Best suited for computing and digital electronics
Low cost and portable	The cost is high and cannot be easily portable

UNIT-202
Digital Network Essentials

1. Internet Fundamentals
2. Web Browsing
3. Web Search Engines
4. E-mail
5. Need of Computer Network
6. Data Communication Fundamentals-Analog and Digital Signal transmission
7. Transmission Media-Guided Media: Twisted pairs, Coaxial Cable, Optical Fibers 
8. Transmission Media-Unguided Media: Radio-wave, Microwave, Satellite, Wi-Fi
9. Network Classification-LAN, MAN, WAN, PAN
10. Internet Security