Guralp Systems CMG-DCM build <10,000 - Manual (Page 162)

Acquisition Modules and Platinum Firmware Transmitting Data
12 Transmitting Data
Received data may be re-transmitted in near real time in one or more of a
number of different formats. By default, a GCF Scream server and GDI Link
transmitter are instantiated, both configured to forward all received data. Any
other desired transmitters must be configured and enabled before use.
The following transmission services are currently available:
• GCF BRP serial server - see section 12.1.2 on page 166
• GCF BRP network server - see section 12.1.3 on page 169
• GCF Scream network server - see section 12.1.4 on page 174
• SEEDlink - see section 12.2 on page 179
• EarthWorm – see section 12.3 on page 186
• CD1.1 - this is covered in a separate manual, MAN-EAM-1100.
• GSMS: Güralp Seismic Monitoring System - see section 12.4 on page 192
• QSCD: Quick Seismic Characteristic Data - see section 12.5 on page 196
• WIN sender - see section 12.6 on page 198
12.1 GCF
Three GCF servers are available, a GCF BRP serial server, which can output
data over any available serial port, a GCF BRP network server and a GCF
Scream network server. All of these take their input from one or more GCF
compressors. These servers are described in the next section.
12.1.1 The GCF compressor
The GCF compressor, gdi2gcf, converts from GDI to GCF format. It provides
channel filtering, channel name mapping and data buffering for the gdi-record
service, which writes GCF files to mass storage device.
One instance of gdi2gcf is present in the default configuration. Additional
instances may be created as required. This will be necessary if you have
different channel filtering requirements for, say, recording and transmitting or
if you need different transmitters to send different sets of channels. The
configuration page for every transmitter has, in the “Expert mode” options, a
drop-down menu which allows the operator to select which compressor
instance to use for its input. The gdi­record configuration page has a
similar facility.
Instances of the GCF compressor are “dependant services”, meaning that they
do not need to be (and should not be) configured to start automatically when
MAN-EAM-0003 162 Issue E - February 2014