Free Discussion
| Synchronous TDM | Statistical TDM |
|---|---|
| In Synchronous TDM data flow of each input connection is divided into units and each input occupies one output time slot. | In Statistical TDM slots are allotted dynamically. i.e. input line is given slots in output frame if and only if it has data to send. |
| In Synchronous TDM no. of slots in each frame are equal to no. of input lines. | In Statistical TDM, No. of slots in each frame are less than the no. of input lines. |
| Buffering is not done, frame is sent after a particular interval of time whether someone has data to send or not. | Buffering is done and only those inputs are given slots in output frame whose buffer contains data to send. |
| Synchronization bits are used at the beginning of each frame | No synchronization bits are used |
| Max. Bandwidth utilization if all inputs have data to send. | The capacity of link is normally is less than the sum of the capacity of each channel. |
| In Synchronous TDM de-multiplexer at receiving end decomposes each frame, discards framing bits and extracts data unit in turn. This extracted data unit from frame is then passed to destination device. | In Statistical TDM de-multiplexer at receiving end decomposes each frame by checking local address of each data unit. This extracted data unit from frame is then passed to destination device. |
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