12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 141
Input Modules
Composite Clock Input Module
Table 5-1
describes the indicators located on the front panel of the CC Input
module.
The CC input signal is accessible at the front panel MONITOR jack and is available
whenever an input signal is present. This monitor is isolated from the input by
860
Ω
.
Functional Description
Figure 5-2
is a block diagram of the CC Input module. The CC Input module extracts
clock and data from the CC input signal. A divide-by circuit reduces the input signal
to 1 Hz. A Phase Detector then measures the phase between the CC input signal
and the system clock over a 1 second interval.
Table 5-1. Indicators on the Composite Clock Input Module
Indicator
Color
Description
POWER
Green
On = Power is applied.
REF
Green
On = The oscillator is phase locked to the input
reference applied to this module.
LOS
Red
On = Loss of Signal.
FAULT
Red
On = Module Failure
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