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Elements of converged networks

As explained earlier, the converged network integrates data, voice, and video into a single network. This is achieved thanks to the technologically advanced equipment and the TCP/IP protocol. Thus, it can be said that the elements of converged networks are a convergent device and a converged service. An example of a convergent device is the multiplexer (as in Figure 1.26) that, at its input, merges multiple communication signals into a single signal at its output. For the converged service, it can be said that it is a service that provides voice, data, and video signals in a single network, thus providing services for all modes of communication:

Figure 1.26.  Orthogonal Frequency Division Multiplexing (OFDM) multiplexing technique used in DSL Wireless Router
You can learn more about  Orthogonal Frequency Division Multiplexing (OFDM) from  http://searchnetworking.techtarget.com/definition/orthogonal-frequency-division-multiplexing