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# Re: Three questions for al earthwormers

- To: earthw-list@nmt.edu, steve@geophys.washington.edu
- Subject: Re: Three questions for al earthwormers
- From: James C. Pechmann <pechmann@seis.utah.edu>
- Date: Thu, 22 Jun 2000 12:20:21 -0600 (MDT)
- Cc: ali@seis.utah.edu, nava@seis.utah.edu, pechmann@seis.utah.edu

    Steve,

         I think that we can help you with your first problem:

    > 1. A way to get state-of-health from refteks using PPP with a 422 card and
    > rtpd. In particular we need to know if the GPS clock is locking when it
    > should.  Right now we have no way of knowing this info without visiting the
    > site.

         There is a University of Utah contributed Earthworm module called
    ref2disk, written by Dave Chavez and Ali Moeinvaziri, which captures
    and stores the state-of-health information from the REF TEKs (including
    state-of-health messages about the clock).  In our current earthworm
    setup, reftektoew takes all telemetry packets received from the reftek
    data loggers via rtpd and sends them to a raw ring.  These packets are
    of various types including waveform data packets, state-of-health packets,
    and station/channel packets.  Additionally, reftektoew converts the
    waveform packets to tracebuf packets and sends them to a wave ring.

         The ref2disk module reads the telemetry packets from the raw ring,
    writes the waveform data to disk files in SAC format, and writes all
    non-wavefrom packets (station/channel and state-of-health) to disk as
    binary files.  These files can be read using the Passcal program
    refpacket.  Our technicians regularly look at these files to detect and
    diagnose problems with the REF TEKs.  Ref2disk uses the station/channel
    information to set some of the SAC header variables.

         The state-of-health packets are periodically sent back to the
    recording center by the REF TEKs, at least in our setup.  We don't have
    to request them.  The station/channel packets are sent back whenever
    data acquisition is started.  We are not using 422 cards in our
    REF TEKs right now, because we are still using an older REF TEK
    digital telemetry system.  However, as far as I know the same types of
    data packets should be sent back from the REF TEKs regardless of the
    telemetry protocols used.

         The current documentation for ref2disk on the earthworm web site
    does not mention the treatment of the state-of-health packets.  We will
    get that added.  In the meantime, if you have any questions about this
    module, you may contact Ali Moeinvaziri at ali@seis.utah.edu.

    --Jim Pechmann

    _____________________________________________________________

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