Analog vs. Digital

The difference between analog and digital signals is very important for data communications. The most familiar “analog” communication is a phone call. Varying electrical voltage reflects the variations in the volume and tone of the human voice. By contrast, digital communications use a series of 1s and 0s to carry information from point to point. Modems actually convert the digital data of one computer into an analog signal for transmission over the phone lines. On the receiving end, another modem converts the analog signal back into a series of 1s and 0s, so the receiving computer can interpret the transmission. Today, phone companies can offer fully digital service between LANs (leased lines such as 56 K, 384 K, and T1s are digital services), or Integrated Services Digital Network (ISDN) which allows dialup connections on an as-needed basis. When it comes to moving data, digital communications are less susceptible to errors and faster than analog signals because they are not susceptible to problems such as electrical “noise” on transmission lines.

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