ABSTRACT
The field of communication has expanded at a very fast pace over the last several decades. Initially, only voice communication was in vogue, but availability of microprocessors, microcomputers, and peripheral equipments have drastically changed the whole scenario. Today, a multitude of information, mostly in digital form, is transported worldwide in a fraction of a second, almost without any kind of error. Very high volumes of digital data along with faster, more reliable, and secure communications are the need of the hour.
