Oscillator Types - Spectracom SecureSync 1200 User Reference Manual

The Oscillators Settings page provides the user with some control of the disciplining process.
This page is also used to configure the length of time SecureSync is allowed to remain in the
Holdover mode when all references are lost.
3.5.1

Oscillator Types

SecureSync units are available with different types of internal oscillators:
The two different types of OCXO oscillators are a precision OCXO oscillator and a high-pre
cision (low phase noise) OCXO oscillator. The two different types of Rubidium oscillators are a
precision Rubidium oscillator and a low-phase noise Rubidium oscillator. All of these internal
oscillators are self-calibrating and can be disciplined to a 1PPS input reference for maximum
accuracy.
Because of its high degree of stability, the Rubidium oscillator provides the greatest ability to
extend the hold-over period when input references are not present. Extending the hold-over
period allows the unit to provide very accurate and useable time stamps and a 10 MHz output
for a longer period of time once time synchronization has been lost.
The Rubidium oscillator is atomic in nature but requires no MSDS (Material Safety Data Sheet).
For additional information on oscillator accuracies, see "10 MHz Output" on page 24.
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Note: Host disciplining
with a Rubidium oscillator.
TCXO (Temperature-Compensated Crystal Oscillator)
one of two different types of OCXO (Oven-Controlled Crystal Oscillator) oscillators, or
one of two different types of Rb (Rubidium) oscillators.
Note: Oscillators are installed at the factory, in accordance with order spe
cifications; an oscillator cannot be swapped/retrofitted later in the product life
cycle (with the exception of repairs).
Note: External Oscillator
SecureSync's 10 MHz output via an external PLL, with the lock state of the
external PLL monitored by SecureSync. Contact Spectracom for more information.
is NOT supported by SecureSync units that are equipped
: It is possible for an external oscillator to be locked to
3.5 Managing the Oscillator
195