Question
What is digital time division multiplexing?
Answer Options
- A) Two or more data streams are assigned to discrete sub-carriers on an FM transmitter
- B) Two or more signals are arranged to share discrete time slots of a data transmission
- C) Two or more data streams share the same channel by transmitting time of transmission as the sub-carrier
- D) Two or more signals are quadrature modulated to increase bandwidth efficiency
Correct Answer: B
Explanation
Digital Time Division Multiplexing (\text{TDM}) is a common method used to allow multiple digital users or services to share a single communication channel, such as a trunked repeater system or a high-speed digital link. Unlike \text{FDM} (which divides the channel by frequency), \text{TDM} divides the channel by time.
Digital \text{TDM} works by arranging two or more signals to share discrete time slots of a data transmission. Each user or service is assigned a very short, repeating burst of time during which they alone are allowed to transmit their data. By interleaving these very rapid time slots, the single channel can carry several simultaneous, independent digital conversations, giving each user the impression of continuous access.
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