Midterm Flashcards
(39 cards)
Telecommunication
Communication at a distance
Data
Information presented in whatever form is agreed upon by the parties creating and using the data
Data communications
The exchange of data between two devices via some form of transmission medium such as a wire cable
Message
The message is the information (data) to be communicated
Sender
The device that sends the data message
Receiver
The device that receives the message
Transmission medium
The transmission medium is the path by which a message travels from sender to receiver
Protocol
A protocol is a set of rules that govern data communications
Simplex
The communication is unidirectional
Example of Simplex
Keyboards and traditional monitors
Half-duplex
Each station can both transmit and
receive, but not at the same time
Example of Half-duplex
Walkie-talkies and citizen band radios
Full-duplex
Both stations can transmit and
receive simultaneously
Example of Full-duplex
Telephone network
Network
A set of devices connected by communication links
Point-to-point
A point-to-point connection provides
a dedicated link between two devices
Multipoint
A connection is one in which more than two specific devices share a single link
Mesh
Every device is connected to another device via a particular channel
Advantages of Mesh
- robust.
- the fault is diagnosed easily
- reliable
- security
- privacy
Disadvantages of Mesh
- installation and configuration are difficult
- the cost of cables is high
- the cost of maintenance is high
Star
All the devices are connected to a
single hub through a cable.
Bus
A network type in which every computer and network device is connected to a single cable.
Ring
Each device has a dedicated point-to-point connection with only the two devices on either side of it.
Hybrid
A main star topology with each branch connecting several stations in a bus topology
