[aprssig] A few clarifications for a club APRS presentation, Please
oh2kku at iki.fi
Sat May 24 08:49:24 CDT 2008
Steve Noskowicz wrote:
> Regular Packet:
> 1 - Must address specific stations.
> 2 – Must also specify specific digis.
> 3 – Must specify the complete path (*all* station/digi names) to reach a
> distant station.
> 4 – Must "connect" (verify with a two way exchange) with a station to transfer
This is a minor detail, but there are automated routing systems that are
(or have been) used for regular packet. Some of the most common ones are
net/rom, rose, and flexnet. Basically you first connect to a node that
participates in that routing system and tell it the end node you want to
connect to. If the system knows how to reach the end node, it
transparently relays your packets, with acks/retransmissions. I'm not
talking standard digipeating here. These routing systems are built on
top of basic AX.25.
You can also exchange unconnected/unnumbered information frames in
regular packet, but typically they were only used for things like
announcing you are on the frequency (beacons) and broadcasting who has
new mail in a given BBS. Some routing systems also rely on regularly
broadcasting their node lists for routing information propagation.
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