Source System
[Sender
Devices]
Medium
[Channel]
Destination
System
[Receiver Devices]
Sender Device Transmitter Transition
System Receiver Destination
Device
Digital Signal Digital Signal
Analog Signal Analog Signal
Communication Model
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Data Communication Model , Lecture notes of Data Communication Systems and Computer Networks
Simple model of data transfers from transmitter to Receiver .
Typology: Lecture notes
2017/2018
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Source System [Sender Devices]
Medium [Channel]
Destination System [Receiver Devices]
Sender Device (^) Transmitter Transition System
Receiver Destination Device
Digital Signal (^) Analog Signal Analog Signal Digital Signal
Communication Model
Source or Transmitter Device
Application Layer
Communication Layer
Network Layer
Application Layer
Communication Layer
Network Layer
It is a Software Application like :GUI [ Graphical User Interface] or Shell like DOS [Disk Operating System] that take data from User.
This layer take date ex.( text , audio , video , etc.. ) and Convert it in to Binary signals [Digital Signals ] in packets ,framers like( 0101010111010101 ) and transfer this signals in to the modem or Network. This Layer take Binary Signals [Digital Signals ] and Convert it in to Analog Signals to can be transfers in the Medium or Channel.
Example : Data Communication Model Sending Text “Hello” Sending Text on WhatsApp: Hello Application Layer that convert “hello” with ASCII Code to “01001000 01100101 01101100 01101100 01101111” It send to the modem as Digital Signal.
Modem Convert Digital Signal in to Analog Signal
Modem Convert Analog Signal in to Digital Signal
Application take Digital Signal “01001000 01100101 01101100 01101100 01101111” And convert it with ASCII Code TO “Hello”
Receive Text to WhatsApp: Hello
Transfers the Analog Signals [Infrared Wireless] From The Transmitter Modem To The Receiver Modem