Guralp Systems CMG-DCM build <10,000 - Manual (Page 250)

Acquisition Modules and Platinum Firmware Technical operation
15 Technical operation
15.1 Cylindrical Digitisers
Güralp Systems Ltd's cylindrical digitisers provide a CMG-DM24 and a
CMG-EAM in a single package: a stainless steel or aluminium cylinder with
an optional carrying/mounting bracket. An internal Spyrus PC card provides
authentication and digital signing of CD1.1 frames and subframes.
The system is fitted with variable gain analogue inputs, tamper-detection
lines on all key connectors and an internal USB storage device, which is
available to external USB host devices such as laptop computers.
The connectors are significantly different from other packages. The analogue
connectors are grouped at one end of the cylinder and correspond to similarly
labelled connectors on a standard CMG-DM24:
MAN-EAM-0003 250 Issue E - February 2014