DATA COMMUNICATIONS
Notes
The term telecommunication means communication at a
distance. The word data refers to information presented in
whatever form is agreed upon by the parties creating and using
the data. Data communications are the exchange of data
between two devices via some form of transmission medium
such as a wire cable.
Components of a data communication system
1
25/04/26
, DATA FLOW
Data flow (simplex, half-duplex, and full-duplex)
25/04/26 L1.2
, NETWORK
A network is a set of devices (often referred to as nodes)
connected by communication links. A node can be a
computer, printer, or any other device capable of sending
and/or receiving data generated by other nodes on the
network. A link can be a cable, air, optical fiber, or any
medium which can transport a signal carrying
information.
Computer Network L1.3
, Network Criteria
Performance
– Depends on Network Elements
– Measured in terms of Delay and Throughput
Reliability
– Failure rate of network components
– Measured in terms of availability/robustness
Security
– Data protection against corruption/loss of data due to:
– Errors
– Malicious users
Computer Network L1.4
Notes
The term telecommunication means communication at a
distance. The word data refers to information presented in
whatever form is agreed upon by the parties creating and using
the data. Data communications are the exchange of data
between two devices via some form of transmission medium
such as a wire cable.
Components of a data communication system
1
25/04/26
, DATA FLOW
Data flow (simplex, half-duplex, and full-duplex)
25/04/26 L1.2
, NETWORK
A network is a set of devices (often referred to as nodes)
connected by communication links. A node can be a
computer, printer, or any other device capable of sending
and/or receiving data generated by other nodes on the
network. A link can be a cable, air, optical fiber, or any
medium which can transport a signal carrying
information.
Computer Network L1.3
, Network Criteria
Performance
– Depends on Network Elements
– Measured in terms of Delay and Throughput
Reliability
– Failure rate of network components
– Measured in terms of availability/robustness
Security
– Data protection against corruption/loss of data due to:
– Errors
– Malicious users
Computer Network L1.4
