Communication Channel Configuration

There are two basic configurations used for establishing communication channel or communication line. These are:-

(i). Point-to-Point Link

(ii). Multi-Point Link

(i). Point-to-Point Link

This point-to-point link basically relies upon the two functions i.e. transmit and receive. It is very simple channel configuration in which the computers or devices or other electronic circuits are to be connected using the dedicated communication lines. Dedicated communication line means that the connection is established using direct lines which connect the devices to other devices. Usually these communication channels are under-utilized because the terminal or the device which uses this channel may not be active, which is required to keep the line busy. It is costlier link because for every connection we need to
have a separate cable.

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Multiplexer and Demultiplexer

In computer networks, multiplexing is used to refer to a process where multiple channels are combined together to form a single bandwidth, and is transferred across the communication media. As we have cable in t.v. which gives plenty of channels in a single wire. This technique helps in making the transmission more inexpensive by transmitting the expensive signals. The device which perform this task is known as Multiplexer ( MUX ). So, it reveals that the multiplexing is a process of combining many channels in to one single bandwidth.

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