I am afraid it is as Rein says. FBB, which uses B1F compression (hope I remember right) does not compress the sysop keyboard, but just the BBS traffic.
JNOS has a compressed ttylink mode that uses LZW and has never worked for me (compile errors), but which might provide an edge. PTC-II boxes can do Huffman and some other sort of limited compression on the fly, but only has english and german Huffman tables. It is NOT used on BBS FWD. 73 de Jose, CO2JA ---- KV9U wrote: > Rein, > > I am not clear on this. The B2F compression is used with Winlink 2000. I > am not sure what it really is other than a compression scheme to nearly > double plain text throughput and is some kind of adaptation to the > protocols that were adopted by FBB such as B1F. > > Shouldn't this work with even short data packets? > > If you were doing some keyboarding with an ARQ mode that was running at > 100 baud, like Pactor, (but could drop down according the conditions ... > unlike Pactor), and even if you used a cycle of 2 or 3 seconds > transmitting and .6 seconds open for ACK or NAK, wouldn't this still > work reasonably well with a throughput faster than most can keyboard? > And by using the B2F compression, and doubling the throughput, get > further enhancements? > > 73, > > Rick, KV9U > > > > Rein Couperus wrote: > >>> Unfortunately this won't work. BZ2 compression is based on 'redundancy' in >>> a message. There is hardly any redundancy in short messages as used in >>> k-to-k. >>> >>> The only way you can do that is by using context-based compression, like >>> the 'context based huffman' compression in pskmail, which reaches >>> compression factors of 1 ... 50 : 1. >>> >>> Rein PA0R >>> >>> (by the way, it is open source). >>> >>> >>> > Rick, KV9U had previously said: > > By the way, I have often wondered why the B2F binary compression system > used with the Winlink 2000 system has never been used for nearly a 2:1 > compression for improved throughput. This could be applied to any > system, including keyboarding. > > 73, > > Rick, KV9U Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
