data transmission Flashcards
Define data transmission
data transmission is the movement of data bits between at least 2 digital devices over short and long distances
what is serial transmission
data is transmitted one bit at a time over one single wire or channel, it is synchronous, it is slower then parallel. it is for long distances
e.g USB
what is parallel transmission
data transmitted multiple bits at a time over multiple wires/channels. it is asynchronized, it is expensive, it is fast, its for short distances
e.g Integrated Circuit
what is simplex transmission
it is in 1 direction
e.g computer to printer
what is half-duplex transmission
this is data transmitted in both directions but not simultaneously
e.g walkie talkie
what is full-duplex data transmission
it is in both directions and simultaneously
e.g phone call
what is synchronous data transmission
it is transmitted in a continuous stream of data
the data is accompanied by timing signals
ensures sender and receiver are synchronized
timing must be accurate
faster than asynchronous
what is asynchronous data transmission
it is transmitted in discrete packets
each packet of data is sent with control bits
so the receiver knows when the data starts and ends
prevents data being mixed up
sent with time intervals
slower than synchronous
What happens when a device is plugged into a computers using one of the USB ports?
The device is automatically detected.
a device driver is loaded.
