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[aprssig] Mystery packet

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Thu Dec 10 13:39:53 UTC 2009

Pete Loveall AE5PL Lists wrote:
> So, bottom line is the TNC that was used to receive this packet indicated all digi'ed bits in the text representation of the packet which is perfectly acceptable as there is no monitor format in the AX.25 spec.  The spec describes the link protocol, not the presentation of that information.

The only thing not mentioned in this thread so far is that the AX.25 
packets on the air actually HAVE the "Used" bits set on ALL of the 
leading stations in the path.  It is only the humanly-readable format 
that sometimes (most of the time) suppresses the earlier ones and only 
puts the * on the last packet in the path to have been marked "used".  
This drove me nuts the first time I tried to interpret raw KISS packets 
(barely wrappered AX.25)  and thought my program was buggy due to all of 
the *s I was seeing.

Lynn (D) - KJ4ERJ

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