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

Table 7-23 describes the status indicators (LEDs) located on the front panel of the

Composite Clock Output module.

Table 7-23. Composite Clock Output Module Indicators
Indicator
POWER
INPUT
FAULT A
INPUT
FAULT B
OUTPUT
FAULT

Functional Description

Refer to Figure 7-10
reference input signals (A and B) from separate Frame Generator Modules and
selects one signal (normally A). If the selected reference signal fails, the module
detects the loss and switches to the alternate signal. The processor can also switch
references on fault conditions or by operator command. The selected reference
signal is then sent through delay circuits to allow phase adjustment for cable length
compensation. This signal is then amplified and coupled to the output ports through
transformers. There are separate phase adjustment switches on the front panel for
the first ten and second ten outputs.
The module checks the outputs to confirm signal presence. Should an output fail,
the front panel OUTPUT FAULT indicator lights.
Power A and B on the main shelf provide power to the module. These redundant
sources of –48 vDC are diode-coupled and fused, allowing the module to draw
power from either source. The internal fuse labeled F1 protects the circuitry from
excessive current. The DC-to-DC Converter changes the negative voltage into +5
vDC; the green POWER indicator on the front panel is lit when either power source
is available to the module. The POWER indicator turns off when power is lost, for
example if the fuse on the module opens, if both –48 vDC power inputs are lost, or if
the converter fails.
12778474-002-2 Revision F – March 2004
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Color
Green On = Module is receiving power.
Off = Module is not receiving power.
Amber On = No reference signal at input A, or failure of module
input buffers.
Off = Reference signal at input A.
Amber On = No reference signal at input B, or failure of module
input buffers.
Off = Reference signal at input B.
Red On = Output failure (one or more).
Off = All outputs available.
for the following functional discussion. The module accepts two
Output Modules
Composite Clock Output Module
Description
TSG-3800 User's Guide 237