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"Nak" and "NAK" redirect here. For other uses, see Nak (disambiguation).
||It has been suggested that NAK (protocol message) be merged into this article. (Discuss) Proposed since June 2015.|
|This article relies largely or entirely upon a single source. (March 2012)|
- In telecommunications, a negative-acknowledge character (NAK or NACK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up.
- In Binary Synchronous Communications protocol, the NAK is used to indicate that a transmission error was detected in the previously received block and that the receiver is ready to accept retransmission of that block.
- In multipoint systems, the NAK is used as the not-ready reply to a poll.
- 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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