Transmission block

In telecommunications, the term transmission block has the following meanings: Some protocols require each transmission block to end with an end-of-message marker.

This is often a control character such as End-of-Text (ETX), End-of-Transmission-Block (ETB), or End-of-Transmission (EOT).

Some protocols (especially those requiring ETX) require each transmission block to begin with a Start-of-Text character (STX).