[Packet] UI Codes?

[Bob Donnell]

Hi Bob, from another one.

The exact display of the packet frame type codes is something that can vary 
from one TNC manufacturer to the next, and on connected-mode packet frames 
can also show the current frame number being transmitted, in the case of 
an connected information packet, and the next frame expected from the 
other station, in the cases of polling, acknowledgment, reject, and 
information frames.  

As a former customer service guy at AEA, I know that with "our" products 
the display also varied depending on what monitor "level" you chose.  So 
the best answer is to look at the TNC manual.  The info you seek may be 
part of the documentation for the monitoring command, or part of the 
introductory text on how to operate a packet station, that all of the TNC 
manuals I've seen have included, in one form or another.

And on a slightly humorous side-note, it looks like whoever entered the 
beacon text for the packet you included used the arrow keys on the 
keyboard to correct the typing error made, when it's the backspace or 
delete key that should have been used.  That's where all the [D= sequences 
came from!

73, Bob, KD7NM


On Tuesday 30 May 2006 07:56, Dr. Gerald N. Johnson wrote:
> On Tue, 2006-05-30 at 06:40 -0600, W0OXJ wrote:
> > Can anyone point me toward a description of the codes as displayed on
> > my screen,they are enclosed in <> and are attached to many of the
> > fields associated with beacons,nodes and other stations.
> >
> > Samples below:
> >
> > CANON>W0OXJ-15 <D C P>
> >
> > ND0Q>BEACON <UI>:ND0Q-1:DPK PLUEBLOUELVO
> > BBL HAM CLUB
> >
> > Actually a description of all the fields one sees when connected to
> > the TNC.
> >
> > Thanks,
> > Bob
> > W0OXJ
>
> Its been so long since I learned some of them that I don't recall where.
> They would have been described in the definitions of the total packet
> format which may be on line these days. Probably at tapr.org.
>
> UI is beacon or disconnected data transmission.
> C is connect request
> Rn is Roger packet number (n goes from 1 to 7).
> I forget what reject is.
> Sn is sending packets ending in packet n.
> I suppose D is disconnect.
>
> There might be something in the owner's or operator's manual for your
> TNC different TNC codes display them differently.