Paradyne 3610 Application Manual

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Paradyne 3610 Application Manual Manual pdf 57 page image

Principles of Operation4-53610-A2-GB41-70 July 1999Time Division MultiplexingSince transmission facilities are expensive, andfrequently two or more low-speed point-to-pointapplications can share a high-speed digital facility, it ismore efficient to share that capacity. This sharing isprovided by 3600 Series DSUs equipped with a TDM( operating in TDM mode ).A pair of 3600 Series DSUs with TDM or MCMPoperating in TDM mode can provide the equivalent of upto six point-to-point circuits via a single DDS line(Figure 4-2). This single DDS line is able to carry sixseparate channels by interleaving the data on each channelinto time slots of the high-speed aggregate data stream.The receiving TDM, with the aid of framing bits,separates (demultiplexes) the data according to channeland delivers the data to the appropriate output ports. Eachpair of communicating DTEs must be operating at thesame speed (data rate).Figure 4-2. Functional Representation of Point-to-Point Multiplexing