What is bandwidth

Bandwidth has many application fields. It can be used to identify the data transmission capability of signal transmission, the amount of data passing through the link per unit time, and the display capability of the monitor.

1. In analog signal systems, it is also called bandwidth, which refers to the amount of data that can be transmitted at a fixed time, that is, the ability to transmit data in the transmission pipeline. Usually expressed in transmission cycles per second or Hertz (Hz).

2. In digital equipment, bandwidth refers to the amount of data that can pass through the link per unit time. Usually expressed in bps, which is the number of bits that can be transmitted per second.

The word bandwidth originally refers to the width of the electromagnetic wave band, that is, the difference between the highest frequency and the lowest frequency of the signal. Currently, it is more widely used in digital communications to describe the theoretical maximum rate at which a network or line can transmit data. This is not its academic definition, but is used by extension.

Bus bandwidth refers to the total amount of data that the bus can transmit per unit time, which is equal to the product of the bus bit width and the operating frequency. For example: For a 64-bit, 800MHz front-side bus, its data transfer rate is equal to 64bit×800×1000×1000Hz÷8(Byte)÷1024÷1024÷1024≈6.0GB/s

Memory bandwidth index is the data transfer capability that the memory bus can provide. For example: the data transmission frequency of DDR400 memory is 400MHz, then a single module has a bandwidth of 64bit×400×1000×1000Hz÷8(Byte)÷1024÷1024÷1024≈3.0GB/s.

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