Telecom Dictionary - Definitions of terms
Negative-Acknowledge Character - Definition and Use
Negative-Acknowledge Character (NAK) - A Negative-Acknowledge Character is a transmission control character sent by a station as a negative response to the station with which the connection has been set up. Note 1: In binary synchronous communication protocol , the NAK is used to indicate that an error was detected in the previously received block and that the receiver is ready to accept retransmission of that block. Note 2: In multipoint systems, the NAK is used as the not-ready reply to a poll.
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