Glossary
T-BERD/MTS 5800 Timing Expansion Module User Manual
July 2017
22112315, Rev. 004
Page 79
Frequency stabilization —
The process of tuning an oscillator to a specific frequency
for a period of time sufficient to ensure that the oscillator provides a stable timing refer-
ence. The frequency of the TEM Module’s oscillator must be stabilized before it is used
for high accuracy timing applications.
FTP —
File transfer protocol. Protocol used on LANs and the Internet to transfer files.
G
GAUSS —
Unit of magnetic induction.
GLONASS —
Global Navigation Satellite System. Time reference used by Russian
GNSS satellites operated by the Russian Federation and available worldwide.
GNSS —
Global Navigation Satellite System.
GNSS Augmentation —
A method of improving a GNSS system's attributes, such as
accuracy, reliability, and availability, through the integration of external information into
the calculation process.
See also
SBAS (Satellite-based augmentation system).
GNSS Receiver —
A device that receives and processes the signals received from a
GNSS satellite constellation in order to provide position, velocity and time (of the
receiver). The TEM Module is equipped with an internal GNSS receiver.
GNSS System —
The time reference used by GNSS satellites operated by different
countries, and available either worldwide (for example, GPS and GLONASS), or in
specific areas of the world (for example, the BeiDou constellation).
GPS —
Global Positioning System. Time reference used by North and South American
GNSS satellites and available worldwide.
Grandmaster clock —
PTP clock that generates and distributes precisely synchro-
nized time across packet networks per the IEEE1588 v2 standard. The TEM Module,
when connected to a test instrument and synchronized to GNSS can provide a highly
accurate timing and supports measurements of delay between a PTP master clock and
PTP slave clocks.
G
RMS
—
Root mean square acceleration. Unit of measure used to communicate
random vibration specifications.
GUI —
Graphical User Interface. Layout of commands in a user-friendly environment.
See also
UI (user interface).
H
Holdover mode —
Mode of oscillator operation where the external synchronization
source is disconnected, and the oscillator provides high accuracy timing using the
frequency that was obtained from the synchronization source previously (during the
tuning process). The TEM Module’s oscillator can operate in holdover mode after it has
