In telecommunications, an acknowledge character (ACK) is a transmission control character transmitted by the receiving station as an acknowledgement, i.e. an affirmative response to the sending station, perhaps in response to the sending station's transmission of an ENQ.
Binary Synchronous Communications does not use a single ACK character, but has two control sequences for alternate even/odd block acknowledgement.
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
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