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Table of Contents. Analog circuits are circuits dealing with signals free to vary from zero to full power supply voltage. This stands in contrast to digital circuits, which almost exclusively employ âall or nothingâ signals: voltages restricted to values of zero and full supply voltage, with no valid state in between those extreme limits.
What is an analog telephone line? A simple analog telephone line is a voice circuit historically made from copper wire that runs from your local phone company's Central Office (C.O.) building to your business location.The central office houses telephone switching equipment that connects you to the Public Switched Telephone Network (PSTN).his is sometimes referred to as the local loop. Once the analog telephone line is installed, someone can call the phone number that you have subscribed to, and the phone company can connect the call to you.