Guralp Systems CMG-DCM build <10,000 - Manual (Page 138)

CMG-EAM (Platinum Firmware)
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Informational messages;
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Important notices; or
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Warnings
The GCF Scream sender keeps its own audit log, independent from the
system log. The contents of this log are available using the “GCF Audit
Log viewer” facility as described in section 13.3.2 on page 182. The
amount of data retained is controlled by the Audit log size drop-down
menu, whose choices are:
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64Kib (small);
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256Kib (medium);
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2MiB (large); and
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16MiB (huge).
In most configurations, all data for all transmitters is taken from a
single multiplexor, as described in section 1.3 on page 10. For more
complex configurations, it is possible to configure multiple
multiplexers, each with their own set of input and output services. In
these situations, the GDI multiplexer drop-down menu can be used to
select a multiplexer instance with which to associate this transmitter.
The menu offers a list of currently configured multiplexers.
11.3 SEEDlink
The Standard for the Exchange of Earthquake Data (SEED) is an
international standard format for the exchange of digital seismological
data developed by the USGS and adopted as a standard by the
Federation of Digital Broad-Band Seismograph Networks (FDSN).
MiniSEED data is a stripped-down version of SEED data which only
contains waveform data, without the station and channel metadata
that are included in full SEED.
Incoming data in any format other than CD1.1 is converted first into
GDI format. In order to transmit SEEDlink data or record it to disk, it
must be converted into miniSEED format and this is done by the
gdi2miniseed module, known as the GDI Mini-SEED compressor.
11.3.1 The GDI Mini-SEED compressor
A default instance of the GDI Mini-SEED compressor is provided.
Further instances can be created if required for complex
implementations. Although the default instance is not set to start
automatically, it is a necessary prerequisite for both SEEDlink
transmission and recording, so it will be started as a dependant service
when required.
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