Teledyne LeCroy Merlin - Users Manual - Manual (Page 149)

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Merlin Protocol Analyzer User’s Manual CATC SW Version 2.0
The following screenshot shows two examples of Acknowledgments.
Implicit NAK - Packet 14577 is a data packet sent by the piconet Master
device. Packet 14579 should have been a data packet with an
acknowledgment. Instead, it is an empty packet. This Master interprets this
empty packet as an Implicit NAK (i.e., implicitly not acknowledged).
Merlin summarizes this packet exchange by adding an Ack’d field to the
Master’s data packet and setting the Ack’d field to Imp Nak.
ACK - Packet 14580 is the Master’s retransmission of the data sent in
packet 14577. Packet 14582 is the reply by the Slave device. This reply
contains an ARQN field with a value of (= Acknowledge). Merlin
summarizes this packet exchange by setting the Ack’d field on packet
14580 to Ack.