Guralp Systems CMG-DCM build <10,000 - Manual (Page 86)

Acquisition Modules and Platinum Firmware Networking Configuration
7.4.1.1 General tab
The first drop-down menu on the “General” tab, “Timing mode”, allows
selection between NTP and Manual. NTP is recommended for nearly all
applications.
If NTP is selected, further configuration should be carried out on the NTP tab.
Likewise, if Manual is selected, further configuration should be carried out on
the Manual tab.
The second drop-down menu, “Timezone”, allows selection of the time zone
used when dates and times are displayed in web pages, in log-files and on the
command-line. This is a system-wide setting that affects all users.
Note: Changing the time zone of the acquisition unit does not affect
the timestamps of recorded data in any way. The ADC module has
its own clock which always runs in UTC.
MAN-EAM-0003 86 Issue E - February 2014