Guralp Systems CMG-DCM build <10,000 - Manual (Page 179)

Acquisition Modules and Platinum Firmware Transmitting Data
can be populated with a path name which will then be used for dedicated
logging. If left blank, logging occurs (via the standard Linux syslog facility) to
/var/log/messages.
Log level: The drop-down menu controls the level of detail present in log
messages, whether to syslog or to a dedicated log file. Not all of the standard
syslog logging levels are available. The menu offers a choice (in order of
decreasing detail) of:
• Debugging information
• Informational messages
• Important notices
• Warnings
Audit log size: 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 14.4.5 on page 241. The
amount of data retained is controlled by the drop-down menu, where the
choices are:
• 64Kib (small)
• 256Kib (medium)
• 2MiB (large)
• 16MiB (huge)
GDI multiplexer: In most configurations, all data for all transmitters is taken
from a single multiplexor, as described in section 6.1 on page 65. 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
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.
12.2 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 is a stripped-down version of
SEED, 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 mass storage device,
MAN-EAM-0003 179 Issue E - February 2014