Guralp Systems CMG-DCM build <10,000 - Manual (Page 9)

Operator's Guide
1.1.3 Digital Sensor or Digital Instrument
By “Digital Sensor” or “Digital Instrument”,
we mean a single unit combining the
functions of both sensor and digitiser - with
the meanings defined above.
Within this document, the
term digital sensor is used in
the context of either digital
inputs - which may usefully
be connected to either
digitisers or digital sensors - or
configuration dialogues which
can be used to configure both
stand-alone digitisers or the
digitiser modules embedded
within digital sensors.
An example of a digital sensor is the CMG-
3TD true broadband digital seismometer,
shown on the left in standard configuration
and, on the right, in bore-hole format.
1.2 Hardware Overview
Platinum firmware runs on CMG-EAMs, CMG-NAMs, CMG-DASs and
CMG-DCMs. CMG-DCM units (Mk2x and above) shipped with earlier
firmware can be field-upgraded to run Platinum firmware either over
the internet, from a local computer or from a USB data storage device.
The CMG-EAM is based upon an Intel PXA270 32-bit processor
running at 312MHz with 64Mb of RAM and 512Mb of on-board flash.
The amount of flash memory can be increased with the use of Güralp
plug-in flash modules. The CMG-EAM has 100Base-TX Ethernet, up to
8 serial ports for connecting to external devices and several USB ports.
The CMG-DCM uses an Intel SA1100 (StrongArm) 32-bit processor
running at 220MHz with 64Mb of RAM and 192Mb of on-board flash.
The CMG-DCM has up to 7 serial ports for external devices and
10Base-T Ethernet.
The CMG-NAM is a flexible platform but is generally based upon a
VIA C7 processor with 512Mb of RAM and various options for local
storage, including RAID arrays. It has 100Base-TX Ethernet.
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