As a result, the circuitry needed in FDM is more complex than needed in TDM. Conversely, the TDM system requires identical circuits. In addition, different bandpass filters are required.
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Here Asynchronous means flexible not fixed.
COMPARE DIGITAL TECHNIQUES AND MULTIPLEXING TECHNIQUES FULL
Asynchronous Time-Division Multiplexing: Synchronous TDM waste the unused space in the link hence it does not assure the efficient use of the full capacity of the link.In bit stuffing, the multiplexer appends additional bits to device’s source stream. Bit stuffing is used to force speed relationships to equalize the speed between several devices into an integer multiple of each other. To recover from timing inconsistencies Framing bits are used which are usually appended to the beginning of each frame. The order of the receipt notifies the demultiplexer where to direct each time slot, which eliminates the need of addressing. Synchronous TDM uses a concept, i.e., interleaving for building a frame in which a multiplexer can take one data unit at a time from each device, then another data unit from each device and so on. TDM uses frames to group time slots which covers a complete cycle of time slots.
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If it doesn’t have something, the time slot would be empty. Synchronous Time-Division Multiplexing: In this type the synchronous term signifies that the multiplexer is going to assign precisely the same slot to each device at every time even if a device has anything to send or not.Each frame consists of a set of time slots, and portions of each source is assigned a time slot per frame. In TDM, corresponding frames carry data to be transmitted from the different sources. Time-division multiplexing (TDM) is considered to be a digital procedure which can be employed when the transmission medium data rate quantity is higher than the data rate requisite of the transmitting and receiving devices.