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Q:

The difference between TDMA and TDM, CDMA and CDM, FDMA and FDM?

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The main difference between tdm and tdma (also fdm/fdma, etc) is that with tdm (also fdm, etc.) the signals multiplexed (i.e. sharing a resource) come from the same node, whereas for tdma (also fdm, etc.) the signals multiplexed come from different sources/transmitters. - Time Division Multiplexing (TDM) imply partitioning the bandwidth of the channel connecting two nodes into finite set of time slots. - Time Division multiple Access (TDMA) imply partitioning the bandwidth of a channel shared by many nodes, typically an infrastructure node and several mobile nodes, where each node gets to access its dedicated time slot. more
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The main difference between tdm and tdma (also fdm/fdma, etc) is that with tdm (also fdm, etc.) the signals multiplexed (i.e. sharing a resource) come from the same node, whereas for tdma (also fdm, etc.) the signals multiplexed come from different sources/transmitters. - Time Division Multiplexing (TDM) imply partitioning the bandwidth of the channel connecting two nodes into finite set of time slots. - Time Division multiple Access (TDMA) imply partitioning the bandwidth of a channel shared by many nodes, typically an infrastructure node and several mobile nodes, where each node gets to access its dedicated time slot. more
answerbag.com

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