"Analog" refers to information being presented continuously, while "digital" refers to data defined in individual steps. Analog information's advantage is its ability to fully represent a continuous stream of information. Digital data, on the other hand, is less affected by unwanted interference, or noise. In digital computers, data is stored in individual bits, which have a value of either 1 (on) or 0 (off). If graphed, analog signals are shaped as sine waves, while digital signals are square waves. Sound is analog, as it is always changing. Thus, in order to send information over a phone line, a modem must take the digital data given it by the computer and convert it into sound, an analog signal. The receiving modem must convert these analog signals back into the original digital data.
Articles in this section
- How can I use one phone line for both voice and data?
- How do V.92 modem speeds compare to ISDN, ADSL and Cable speeds?
- Does the Model 3090A modem have lights or a speaker ?
- Where can I learn more about modems and V.92/V.44?
- What makes a Zoom V.92 modem faster than V.90?
- Synchronous vs. Asynchronous Data Transfer
- IRQ Settings
- COM Port Settings (DOS/Windows)
- UARTs and Data Buffering
- Flow Control