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Principles of Operation
4-53610-A2-GB41-60 March 1999
Time Division Multiplexing
Since transmission facilities are expensive, and
frequently two or more low-speed point-to-point
applications can share a high-speed digital facility, it is
more efficient to share that capacity. This sharing is
provided by 3600 Series DSUs equipped with a TDM
(operating in TDM mode).
A pair of 3600 Series DSUs with TDM or MCMP
operating in TDM mode can provide the equivalent of up
to six point-to-point circuits via a single DDS line
(Figure 4-2). This single DDS line is able to carry six
separate channels by interleaving the data on each channel
into time slots of the high-speed aggregate data stream.
The receiving TDM, with the aid of framing bits,
separates (demultiplexes) the data according to channel
and delivers the data to the appropriate output ports. Each
pair of communicating DTEs must be operating at the
same speed (data rate).
Figure 4-2. Functional Representation of Point-to-Point Multiplexing