Chapter 1. Introduction

The CMG-DM16R16DCM is a rack-mounted 16-bit digitizer module with 16 differential inputs and Ethernet connectivity, suitable for seismology, environmental monitoring, and medium dynamic range applications.

The DM16R16DCM has three components which are connected inside the unit to provide its overall functionality.

• Two independent DM16R8 digitizers measure analogue signals entering the unit on two banks of 8 BNC connectors, and generate data blocks in GCF format. Either differential or single-ended inputs may be provided.

  These digitizers do not support multiplex (Mux) channels, calibration signals, or GPS power control. They have no internal storage.

• The DCM receives these data blocks on internal serial ports, combines them, and retransmits them over the network.

Depending on how it is configured, the DCM may run a Scream! server providing GCF data to network clients, a SeedLink or DSS transmitter, a CD1.0/1.1 producer, or several of these simultaneously. Any required data conversion is carried out automatically.

The two DM16R8 digitizers may also be configured independently, providing users with more flexibility of data acquisition.

This supplement explains how the internal modules are connected, including full details of input and output ports. For full installation and usage details, see the supplied manuals for the DM16 and DCM components.