Chapter 1
Getting Started
1.1
Model 1200B and 1201B/C Common Features
The foundation of these clocks is the GNSS receiver. It is capable of tracking the USA GPS, Russian
GLONASS, European Galileo, and the Chinese Beidou constellations. In standard configuration,
there are three terminal block outputs capable of providing unmodulated IRIG-B, modulated IRIG-
B, 1 PPS, and Programmable Pulse. The clocks have substantial drive capability to supply timing
to multiple loads in parallel.
Available options include redundant power supplies and auxiliary option boards that provide
additional output signals and drive. See Appendix B for option board information.
Any of the standard I/O connectors may be configured for event capture, or the COM1 RS-232
port may be used for timing the arrival of data. The event timing has 100 nanosecond resolution,
and the clock sequentially records up to fifty events internally.
1.2
Model 1201B/C Advantages
The Arbiter Systems Model 1201B/C provides the utmost in timing accuracy, stability, and
protection from communication attacks and false GNSS signals. First in a new series of synchronized
secure clocks by Arbiter Systems offering an ultra-stable, crystal holdover oscillator, the Model
1201B/C can provide the highest level of timing stability in the presence of a false GNSS signal, or
from losing the GNSS reception.
The Model 1201B/C is more accurate at 100 ns whereas the Model 1200B accuracy is 200 ns.
The Model 1201B/C also benefits from the addition of ultra-stable oscillators with guaranteed
holdover capability. The standard holdover oscillator has a drift rate of less than 1 ms/day.
The addition of the holdover oscillator allows the Model 1201B/C to incorporate “EPS”
technology, for Enhanced Performance and Security. Three components used provide for secure
clock operation include: (1) encryption protection for secure connections, (2) GNSS anti-spoof
shielding, and (3) intelligent holdover capability.
A strategic component providing the highest level of anti-spoofing of the GNSS is a new
multiphase detection GNSS antenna. With this antenna the clock will be able to accurately track
the active satellites and detect false GNSS (spoofed) signals.
