Common words are filler words that do not contain a measurand and are filled with a common pattern. This pattern can be static, such as a hexadecimal word, or dynamic, such as the value of an input port or function generator. Common words are entered into all unused frame words. Encoders normally build a frame for transmission by first filling the entire frame with common words, then overwriting each word by the required data frame and subframe sync words, which are followed by measurands as the major frame is completed.

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