Analog technology takes an audio or video signal, such as music or a human voice, and converts it to electronic signals. The telephony industry has used analog technology for decades. Basic residential and commercial phone service used to be exclusively analog. Subscribers receive their phone service over a POTS (Plain Old Telephone Service) line, and the telephones on either end of the call do the translation work.
Pretty simple. But analog has limitations, most notably of which is the amount of data it can handle, which is why both residential and business phone service has largely converted to digital.
Digital uses a very different method to process sounds and images, converting signals to a binary format in which everything is represented by ones and zeroes. Because this is a more efficient way to transfer data, digital signals can carry more information, resulting in better clarity of sound and images. This also means a digital telephone system can offer more features than an analog system.
High volume call centers typically use digital phone lines known as T1s. They have far greater capacity than analog modems and some features, such as automatic number identification (ANI), are dependent on them.
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