However, reducing the baud rate of a modem may also reduce the maximum data transmission rate.īaud rates above 8000 are not very reliable on analog telephone lines, which is why most modems do not offer higher baud settings. This can be useful if a dial-up ISP requires a specific baud rate for communication. However, many dial-up modems allow you to override the default baud setting and manually enter the baud rate using a software interface. Modems typically select the most efficient baud rate automatically (sometimes called the "autobaud" setting). This means they send seven bits per signal transition, since 7 x 8000 = 56,000. 56K modems often use a baud rate of 8000. Therefore, it would only require a baud rate of 2100 (28,800 / 9). For example, a 28.8 Kbps modem may send nine bits per second. However, most modems transfer multiple bits per signal transition. If a modem transfers a single bit per electronic pulse, one baud would be equal to one bit per second ( bps). While the term was originally used to measure the rate of electronic pulses, it has also become a way to measure data transmission speeds of dial-up modems. For example, if a signal changes (or could change) 1200 times in one second, it would be measured at 1200 baud. Baud, or baud rate, is used to describe the maximum oscillation rate of an electronic signal.
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