Computer Systems Technology DCN386 Lecture Notes - Lecture 5: Plain Old Telephone Service, Bell Labs, Multiplexer
14 Dec 2015
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Types of multiplexing: time division multiplexing (tdm, frequency division multiplexing (fdm) Time division multiplexing (tdm) sharing media based on time slots. Splitting up the frame into segment/time slots, so that each signal sharing the media has their own space equal amount of time. Everyone get an: uses multiplexer (mux) is used to split frames into segments. It comes out the other side, gets reordered and is sent to the same connector. Can share (expensive) lease line with multiple clients. Can make multiple connections on same lease line: disadvantages: if clients don"t send packets, there will be wasted bandwidth. Atdm (asynchronous time division multiplexing) -> everyone gets different amount of time: can be also called statistical time division multiplexing (stdm, uses smux (statistical multiplexer) Has brains (i. e. it is hardware and software driven it gets. Frequency division multiplexer (fdm) -> divides connections with sharing of frequencies. Advantages: distance, protective layer for copper cable.
