A baud rate is a measurement of the number of times per second that a signal element such as a bit is transmitted. For instance the common RS-232 serial port baud rate is 24000 baud or 24000 signal elements transmitted per second. The baud rate of a given system is constrained by the bandwidth of the channel over which it is communicating. When referring to data transmission a baud is a unit of symbol rate or the number of signal changes that occur per second. The speed of transmission of a given system is usually expressed in baud or bits per second (bps).

In data communications baud is synonymous with bits per second (bps). However this usage can be confusing because baud and bps are not equivalent in all circumstances. When measuring analog signals such as voiceband modem signals baud corresponds to the number of times per second that the signal changes amplitude. When measuring digital signals such as computer asynchronous serial data each signal element may represent more than one bit of information. In this case the baud rate is a measurement of the number of signal elements transmitted per second not the number of bits per second.

The term baud is not always used correctly even by experienced engineers. It is often misused when referring to the data rate in bits per second. The baud rate is always a measure of symbol rate and the terms should not be used interchangeably.

Baud rates are commonly used when referring to the speed of a serial connection. The baud rate is the number of signal units transmitted per second. Most serial ports have a default baud rate of 9600 baud. The term is also used when discussing the speed of a voiceband modem connection. In this case the baud rate is a measure of the number of times per second that the signal changes amplitude.

The baud rate of a system is constrained by the bandwidth of the channel over which it is communicating. The baud rate is also limited by the nature of the signal being transmitted. For instance a voiceband modem can only achieve a maximum baud rate of about 56000 because the bandwidth of a standard telephone line is only 3000 Hz.

## What is a baud rate?

A baud rate is a measure of the number of symbols that can be transmitted per unit of time.

## How is baud rate measured?

Baud rate is measured in bauds per second.

## What is the unit of measurement for baud rate?

The unit of measurement for baud rate is bauds per second.

## What is the relationship between baud rate and data rate?

The data rate is the number of bits that can be transmitted per second while the baud rate is the number of symbols that can be transmitted per second.

## What factors affect baud rate?

The factors that affect baud rate include the type of modulation used the bandwidth of the channel and the noise level.

## What is the relationship between baud rate and bandwidth?

The relationship between baud rate and bandwidth is known as the bandwidth-limited data rate.

## What is the bandwidth-limited data rate?

The bandwidth-limited data rate is the relationship between baud rate and bandwidth.

## What is the relationship between baud rate and noise?

The relationship between baud rate and noise is known as the noise-limited data rate.

## What is the noise-limited data rate?

The noise-limited data rate is the relationship between baud rate and noise.

## What is the relationship between baud rate and error rates?

The relationship between baud rate and error rates is known as the error-rate-limited data rate.

## What is the error-rate-limited data rate?

The error-rate-limited data rate is the relationship between baud rate and error rates.

## What is the relationship between baud rate and transmission time?

The relationship between baud rate and transmission time is known as the delay-limited data rate.

## What is the delay-limited data rate?

The delay-limited data rate is the relationship between baud rate and transmission time.

## What is the relationship between baud rate and throughput?

The relationship between baud rate and throughput is known as the capacity-limited data rate.

## What is the capacity-limited data rate?

The capacity-limited data rate is the relationship between baud rate and throughput.