Functional Description - Symmetricom TSG-3800 Series User Manual

Table 7-30 describes the RS-422 8 kHz Clock Output Module front panel status
indicators (LEDs).
Table 7-30. RS-422 8 kHz Output Module Indicators
Indicator
POWER
INPUT FAULT A
INPUT FAULT B
OUTPUT FAULT

Functional Description

Refer to Figure 7-14
reference input signals (A and B) from separate Frame Generator Modules. The
module selects one of these signals (normally A) and applies it to two drivers. Each
driver supplies 10 square wave outputs in an RS-422 format.
If reference signal A fails, the module detects its loss and switches to reference
signal B. The processor can also switch references.
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 = The module is receiving power.
Amber On = No reference signal applied to input A.
Amber On = No reference signal applied to input B.
Red On = Output failure on one or more channel.
for the following functional discussion. The module accepts two
Output Modules
RS-422 8 kHz Clock Output Module
Description
TSG-3800 User's Guide 247