which groups 2 bits into symbols which are then transferred instead of the bits themselves, and allows for an increase in data transfer speed without increasing the frequency of the bus. The effective or real data transfer speed/rate may be lower due to the use of encoding that also allows for error correction, such as 128/130b (b for bit) encoding. The data transfer speed is also known as the bandwidth.

Bus multiplexing

The simplest system bus has completely separate input data lines, output

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