Transistion Modes Flashcards
Serial
transmission
Data is sent one bit at a time along the same data line
Parallel
transmission
A number of bits sent simultaneously over multiple data lines
Simplex
Data Transmission is possible in one direction only.
Half duplex
Data Transmission is possible in both directions but only in one direction at the
same time.
Duplex
Data Transmission is possible in both directions simultaneously
Multiplexing
signals (digital or analogue) are combined into one signal and sent over a shared medium.
Switching
Examining packets and routing them to a specific destination.
Routing
Routing is the process of moving packets across a network from one router/node to a another. Routers hold information about the addresses of devices in the network or other networks in a routing table.
FDM
(Frequency-division multiplexing)
The available channel bandwidth is split into narrower bands each one is used for a separate transmission.
TDM
(Time-division multiplexing)
The available channel bandwidth is split into short time intervals each one is used for a separate transmission.
CSMA/CD
(Carrier Sense Multiple Access/ Collision Detection). A protocol for managing data traffic on a network.
It detects collisions and deals with collisions by resending packets after a random time.
Circuit switching
Path is set up from sender to receiver for the duration of the transmission and kept open until transmission complete. All data follows same path , in order. Path not used by any other data.
Packet switching
Data split into packets. Each packet takes its own route from sender to receiver occupying the channel for only a short time. Packets may need to be reordered. Better security ( harder to intercept) , More efficient use of data lines ( no waiting during gaps), less likely to bee affected by network failure
Handshaking
Exchange of signals between devices to establish their readiness to communicate
