Time division multiplexing (AQA A-Level Physics): Flashcards
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TDM definition
TDM definition
Method that increases data transmission rates by combining multiple data streams into single transmission
How TDM divides transmission time
How TDM divides transmission time
Into distinct time slots for each data stream
What time slot packets contain
What time slot packets contain
Data marked with identifiers for recognition
Multiplexer (MUX) function
Multiplexer (MUX) function
Combines data streams & allocates time slots
Demultiplexer (DEMUX) function
Demultiplexer (DEMUX) function
Receives combined signal & separates packets into streams
DEMUX requirement for correct extraction
DEMUX requirement for correct extraction
Must be synchronised with the multiplexer
Bandwidth requirement for TDM
Bandwidth requirement for TDM
Greater than sum of individual stream bandwidths
TDM advantage: cost
TDM advantage: cost
Cost-effective, efficient use of single transmission path
TDM disadvantage: data rates
TDM disadvantage: data rates
Each stream's rate decreases as more streams added
TDM disadvantage: time slots
TDM disadvantage: time slots
Empty slots wasted if no data sent from that stream