Functional Description; Esf/D4 Output Module Status Indicators - Symmetricom TSG-3800 Series User Manual

Table 7-11 describes the front panel status indicators (LEDs) on the ESF/D4 Output
module.
Table 7-11. ESF/D4 Output Module Status Indicators
Indicator
POWER
INPUT
FAULT A
INPUT
FAULT B
OUTPUT
FAULT

Functional Description

Refer to Figure 7-6
Frame Generator B provide the signals, IN1A and IN1B, and the clocks, CLK1A and
CLK1B, respectively, to the Output module. The signals are DS1 signals, with the
ESF framing format. The Output module buffers these signals, then sends them to
the A/B Selector and to the LOS Detector.
The A/B Selector normally selects the signals and clock from Frame Generator A.
However, the CPU can force the Output module to select Frame Generator B by
setting the A/NB signal to a logic "0". This happens when the User instructs the CPU
to disable Oscillator A or Frame Generator A, or if the CPU determines there is a
problem with Oscillator A or Frame Generator A. The module itself will switch to
Frame Generator B if the LOS Detector determines that one or more of the signals
from Frame Generator A has (have) been lost. When this occurs, the INPUT FAULT
A indicator is turned on and the CPU is informed. The INPUT FAULT B indicator is
turned on if a problem with the signal or clock from Frame Generator B is detected,
and the CPU is informed. INPUT FAULT B does not cause the TSG to change the
selected Frame Generator.
From the A/B Selector, the selected signal and clock are sent to the ESF/D4
Converter. The ESF/D4 Converter converts the ESF input into a D4 framed, "all
ONEs" signal, which is then sent to the 10 output channels.
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. Frame Generator A and
Output Modules
ESF/D4 10-Output Module
Description
TSG-3800 User's Guide 223