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Re: 19990608: new unidata ldm server for ACARS

Steve,

  Thanks for the info.  We understand the problems with changing
something as fundamental as the feedtype list in LDM.  Just so you
understand, FSL is severely limited in distributing data due to our
agreements with our data sources.  While many of our datasets are
similar or the same to IDD, we cannot use those more generic feedtypes
because our sources are different.  Our ability to control who we
could distribute particular data to thru LDM was severely hampered
when the feature to specify the data ID was removed from the
upstream server in the upgrade from v4 to v5.  Is there any chance
of that feature ever returning when you guys can finally get back in
the development mode?  Anyway, if you ever get to a point when you can
play with the feedtype assignments, keep us in mind to possibly get
a few more from you.  As you know, FSL relies heavily on LDM for 
our data distribution, both within and outside.  We really appreciate
all the support you've provided us.

Joan
> 
> >From: Joan Brundage <address@hidden>
> >Organization: .
> >Keywords: 199906081602.KAA27293
> 
> >I've replaced zero in our LDM server configuration with
> >shemp.ucar.edu as requested.  Thelma remains.
> >
> >Before the week is out, we plan to change the feedtype used
> >for the QC's ACARS data from FSL2 to PCWS - unless of course
> >you have an extra feedtype to give out.  I'll notify when that
> >is about to happen.
> >
> >Joan Brundage, FSL
> >
> 
> 
> Joan,
> 
> Thank you for making the feed change. 
> I have turned off the request from zero and started the feed directly 
> from shemp. We appreciate your efforts to change the feed type to PCWS
> for the ACARS data.
> 
> The technical problem with using the same feed ID for both the profiler
> and ACARS data sets when routing topology is different is the possibility
> for a loss of data if a disconnect/reconnect occurs. When a downstream site
> has to reconnect, it will use the time of the last product received 
> as the start point for the data request, and this may be later than
> products arriving on the alternate route. Also, we want to properly
> protect the ACARS data, and since the profiler data flows down the topology
> while we do not want Universities to pass along the ACARS data- since they 
> will all contact FSL directly for the data- the use of a different
> product ID is the best solution.
> 
> At this point in time, a reassignment of feedtypes is not a likely
> course of action since it would require all sites to upgrade immediately,
> and major changes to the LDM are not currently in progress due to
> the loss of Glenn Davis. We can investigate this further at a later time.
> 
> Thank you again, 
> 
> Steve Chiswell
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