Negative-acknowledge Character
In
telecommunications
, a
negative-acknowledge character
(NAK) 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. Source: from
Federal Standard 1037C
and from
MIL-STD-188
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