they are all techniques used to handle a disparity/inequality in the i/p lines data rates.
1-Multilevel TDM.
it's used when the i/p lines data rates are multiple of each other.
for example if u have two i/p lines with data rate of 100kbps each
and another (third) i/p line with data rate of 200kbps
we multiplex the 1st two together (100k + 100k) to produce a data rate of 200kbps
2-Multislot TDM.
it's used to give a single i/p line two slots in the o/p frame, to do this we use a serial to parallel converter
for example if u have one i/p line with data rate of 200kbps
and another (second) i/p line with data rate of 100kbps
we apply serial to parallel converter on the 1st one to change into two i/p lines with data rate of 100kbps each
3-Pulse-Stuffed TDM
it's used when the i/p lines data rates are NOT multiple integers of each other
we make the i/p line with largest data rate the dominant one and add dummy bits to the other i/p lines data rates to be equal to it
for example if u have one i/p line with data rate of 100kbps
and another (second) i/p line with data rate of 99kbps
we make the 1st one the dominant one and add 1kbps of dummy bits to the second one (99k + 1k) to be equal the first one
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