[aprssig] APRS spec 101

Pete Loveall AE5PL Lists hamlists at ametx.com
Wed Jul 16 16:43:35 EDT 2008

FCS is part of the AX.25 specification, not part of the APRS specification.  While closely-coupled, APRS is not 100% tied to the AX.25 specification allowing transport across other mediums such as the TCP/IP, etc.

Hope this helps.


Pete Loveall AE5PL
pete at ae5pl dot net

> -----Original Message-----
> From: Steve Noskowicz
> Sent: Wednesday, July 16, 2008 2:37 PM
> Subject: [aprssig] APRS spec 101
> That's the version number ... one I have printed out.   Thumbing
> throiugh it for some light reading, [yea, right]  I can't find where /
> if it describes the Frame Check Sequence.
> it is a simple sum type checksum?
> Now one may correctly argue that I don't *really* need to know this,
> but being so possessed, I'm curious.   OR should we just assume it is
> covered int the  AX.25 spec?

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