Functional Description; Clock Output Module Indicators - Symmetricom TSG-3800 Series User Manual

The Clock module front panel contains status indicators.
front panel Clock module status indicators.
Table 6-6. Clock Output Module Indicators
Indicator
POWER
LOCKED
SELECTED
EXT REF
HOLDOVER
END OF RANGE
ACQUIRE
FAULT

Functional Description

The Clock Output module consists of the following five sections, as shown in
6-5:
Oscillator
Direct Digital Synthesizer (DDS)
Timing Circuitry
Module Control
The Oscillator provides a 10 MHz sinusoidal output signal for the DDS circuitry. The
type of oscillator varies depending on the Clock module. It may be a Rubidium
oscillator for the highest quality Stratum 2 performance, or various Quartz ovenized
oscillators for the lower quality levels. The output signal is buffered to provide a 10
MHz logic signal as a clock to the DDS circuitry. A separately buffered signal is
provided to the local oscillator (LO) output jacks on the rear panel of the main shelf
for connecting to external equipment such as a GPS receiver.
12778474-002-2 Revision F – March 2004
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Color
Green On = The module is receiving power
Green On = Unit is in Normal mode of operation
Green On = Module selected for providing outputs
Green This indicator not used
Amber On = Unit is in Holdover mode of operation
Amber On = Tuning is below 25% or above 75% of full scale
Amber On = Unit is in Acquire mode of operation
Red On = Fault within the Module
Blinking = Module is disabled
CPU, Frame Generator, and Clock Modules
Clock Module
Table 6-6 describes the
Description
TSG-3800 User's Guide 179
Figure