Symmetricom Z3801A, User Manual

Page: 37 / 98

Chapter 2 Features and Functions
Outputs
User Guide 2-7
Outputs
10 MHz OUT J2 Output
This is a 10 MHz output reference signal traceable to UTC (USNO)
that can be used for synchronizing CDMA test equipment.
10 MHz Outputs—via I/O Port 1 J3
Two additional 10 MHz synchronization signals are available through
the I/O Port 1 J3 connector. Refer to Table 2-3 for signal characteristics
and connector pin assignment information.
1 PPS (One Pulse Per Second) Outputs—
via I/O Port 1 J3
The Receiver outputs two highly accurate 1 PPS time standard outputs
for user-specific synchronization applications. Refer to Table 2-3 for
signal characteristics and connector pin assignment information.
In the GPS locked mode, the Receiver outputs a 1 PPS signal derived
from the internal oscillator, which is locked and traceable back to
Coordinated Universal Time (UTC) as determined by GPS. In the
absence of GPS, the 1 PPS signal will continue to exist, but the
oscillator will go into a holdover mode in which the SmartClock™
algorithm will compensate for the instabilities in the oscillator. In the
holdover mode, the timing 1 PPS accuracy will degrade as the holdover
time increases.