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User Guide
36
the internal oscillator default performance when operating in free-running mode
(See section 2.6.2).
Table 2.9: Oscillator Settings and Status
Result Description
Oscillator status For a proper operation of your xGenius test unit, the oscillator
status should always be Calibrated.
Not calibrated oscillators may not be able to track correctly
an external reference and they could generate large fre-
quency offsets when they operate in free running mode.
Contact with the ALBEDO Telecom customer service or with
the your ALBEDO Telecom local representative if your unit is
showing something different to Calibrated in this field.
Oscillator type Supported oscillator types are TCXO, OCXO and Rubidium.
These are the basic properties and differences between all
three possibilities:
• TCXO: This oscillator has a frequency offset of the order of
1 ppm. It is well suited for all standard test applications not
including one way latency measurements or synchroniza-
tion testing involving GNSS, 1 PPS or PTP interfaces. It
does not support operation in holdover mode.
• OCXO: Standard oscillator for applications involving
GNSS, 1 ppm or PTP interfaces. The frequency offset is of
the order of 0.1 PPS. The long term stability of OCXOs are
better than in TCXOs and for this reason they can be used
in some holdover applications.
• Rubidium: It offers better accuracy than OCXOs both in
terms of phase and frequency stability. This oscillator is
also better shielded against temperature variations than
the OCXO. The main advantage of Rubidium oscillator is
its excellent holdover performance. Rubidium units are
best suited for synchronization tests requiring high accu-
racy degree both in locked or holdover states.
Oscillator lock status This field provides information about the disciplining status
corresponding with the internal clock. It can be one of the fol-
lowing:
• Warm up: Shows that the oscillator is still initializing. No
accurate frequency or phase could be expected when the
oscillator is still in this mode. The Warm up status could
last for a few minutes.
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