[Packet] Odd Hash?

[Dr. Gerald N. Johnson]

On Wed, 2009-07-29 at 22:19 -0700, KD7JYK DM09 wrote:
> I wondered about compression.

It definitely is BBS to BBS compressed forwarding, except those lines
beginning with a recognizable call sign. Those are mostly (those with a
RR at the end) are ACK packets and some control packets, stretched out
by your TNC.

The binary of the others tends to send a terminal program into orbit, so
you might not want to pass them to your terminal program.
> 
> Would this be something like a message list being sent, or a file, or what?

I think its all messages. Look up compressed forwarding in the FBB docs
at tapr for more details.
> 
> Is there any way for me to see what it is?

Its dynamic, on the spot compression, but the FBB docs ought to say how
its done and it may be expandable for monitoring. But its all on each
bbs, if you are a remote sysop to be able to see and read every P
message as well as bulletin, in plain text. The messages are not stored
compressed, just compressed for forwarding.

I've read a book on compression, but I don't remember if I ever worried
about what technique the BBS use for forwarding. It definitely works, it
cuts forwarding time, and I have the monitor mode on my TNC (DED
firmware at the moment) set to ignore certain binary codes and I get
along fine. You probably have to catch the first frame to get the
compression code list its built on. I doubt its frame by frame
compression, but more message by message.
> 
> Kurt
> 
> ----- Original Message -----
> From: "Jonathan Thawley, KC8CPW" <kc8cpw at gmail.com>
> 
> : Looks like data compression between two or more BBS systems...  More
> messages can be transfered at a time by doing that...
> 
73, Jerry, K0CQ