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Data Transmission (Serial (good at long distance (no synchronisation…
Data Transmission
Serial
Data sent 1 bit / time
single wire / channel
good at long distance
no synchronisation problems
slower than parallel
Universal Serial Bus (USB)
Parallel
data sent > 1 bit / time
several wires / channels
good at short distance
bits become skewed at longer ones
desynchronisation
faster than serial
internal electronics (memory to CPU etc)
asynchronous
data is sent with control bits
stop and start bits
prevents mixing up of data
discrete groups of data
slower than synchronous
synchronous
continuous data
faster than asynchronous
timing signals
generated by internal clock
receiver uses these signals to reassemble the bytes
simplex
data can only be sent in 1 direction along a channel
half-duplex
data can be sent both directions along a channel but only 1 direction / time
full-duplex
data can be sent both directions along a channel at the same time