Start signal
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In telecommunication, the term start signal has the following meanings:
1. A signal that prepares a device to receive data or to perform a function. Contrast with A-condition. 2. In start-stop transmission, a signal at the beginning of a character that prepares the receiving device for the reception of the code elements.
Note: A start signal is limited to one signal element usually having the duration of a unit interval.
Source: from Federal Standard 1037C and from MIL-STD-188