Guralp Systems CMG-DCM build <10,000 - Manual (Page 155)

Operator's Guide
12 Building Networks
12.1 GDI-link
The GDI-link protocol provides the most efficient means of exchanging
data between two systems running Platinum firmware. GDI is the
native data format of the central data multiplexer, the gdi­base
module, and GDI-link allows highly efficient, low latency data
exchange between two such multiplexers without the overhead of any
additional protocol conversion. State of health information is attached
to samples before transmission.
GDI links have transmitters, which send data, and receivers which
receive it. These terms do not refer to the direction of initiation of the
network connection: a receiver can initiate a connection to a
transmitter and vice versa.
A single GDI-link receiver can accept data from multiple transmitters
and a single transmitter can send data to multiple receivers, allowing
maximum flexibility in configuring seismic networks.
12.1.1 The GDI-link transmitter
To configure a GDI-link transmitter, connect to the CMG-EAM
configuration system via either the web interface (select “All options”)
or by using gconfig from the command line interface. From the main
screen select “services”, then “GDI link transmitter”. The next screen
shows a list of all GDI link transmitter instances that have been
configured on the CMG-EAM.
In most circumstances you will only need a single GDI link transmitter
but this screen allows you to create more if desired.
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