1. Computer Networks - Introduction - Dr. Hussein al-Bahadili
Data Communications
Data communications are the exchange of data between two devices via some form of transmission medium such as a wire cable.
The effectiveness of data communications systems depends on four fundamental characteristics:
Delivery
Accuracy
Timeliness
Jitter
Computer Networks - Introduction - Dr. Hussein al-Bahadili

2. Computer Networks - Introduction - Dr. Hussein al-Bahadili
Data Communications
Delivery: The system must deliver data to the correct destination, i.e., data must be received by the intended device and only by that device.
Accuracy: The system must deliver the data accurately.
Timeliness: The system must deliver data in a timely manner. Data must be delivered in the same order that they are produced, and without significant delay, such as multimedia data. This is called real-time transmission.
Jitter: It refers to the variation in the packet arrival time.
Computer Networks - Introduction - Dr. Hussein al-Bahadili

3. Components of a Data Communications System
A data communications system has five components:
Message
Sender
Receiver
Transmission medium
Protocol
Computer Networks - Introduction - Dr. Hussein al-Bahadili

4. Components of a Data Communications System
Five components of a data communication system
Computer Networks - Introduction - Dr. Hussein al-Bahadili
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5. Components of a Data Communications System
Message: The system must deliver data to the correct destination, i.e., data must be received by the intended device and only by that device.
Computer Networks - Introduction - Dr. Hussein al-Bahadili

6. Computer Networks - Introduction - Dr. Hussein al-Bahadili
Data Flow
Data flow (simplex, half-duplex, and full-duplex)
Computer Networks - Introduction - Dr. Hussein al-Bahadili
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