[aprssig] Mystery packet
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Thu Dec 10 08:39:53 EST 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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