In telecommunications, a negative-acknowledge character (NAK or NACK) is a transmission handle character sent by a station being a unfavorable response for the station with which the connection has become setup.
In Binary Synchronous Communications protocol,
Office 2010 Professional Plus, the NAK is used to show that an error was detected within the earlier received block and that the receiver is ready to acknowledge retransmission of that block.
In multipoint techniques,
Office Home And Student 2010, the NAK is used as the not-ready reply to a poll.
Within the ASCII code,
Windows 7 Ultimate, the NAK character is 0x15 (hexadecimal),
Buy Office 2007, or ^U. [edit] See also Acknowledge character [edit] References 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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