1. A group of bits or characters transmitted as a unit and usually containing an encoding procedure for error control purposes.
2. In data transmission, a group of records sent, processed, or recorded as a unit.
Note: A transmission block is usually terminated by an end-of-block character (EOB), end-of-transmission-block character[?] (ETB), or end-of-text character[?] (EOT or ETX).
Source: from Federal Standard 1037C
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