Functional Block Diagram - Symmetricom SSU-2000e User Manual

Chapter 7 Input Module Reference Data
1-Port and 3-Port DS1 Input Modules

Functional Block Diagram

A simplified block diagram of the 1- and 3-Port Input modules is shown in
Figure 7-3. Block Diagram of the 1-Port and 3-Port DS1 Input Module
Phase Measurement Averages
The Input module also maintains averages of past phase measurements including:
1000 one-second averages
1000 100-second averages
100 1000-second averages
10 10000-second averages
To account for momentary jumps in phase, the Input module uses a phase buildout
algorithm for phase jumps greater than or equal to 1 microsecond per tenth of a
second. To prevent confusing frequency offsets for phase jumps, the phase build-out
algorithm does not build-out more than eight consecutive samples. If the phase is
built out, the Input module sends an event message to the Communications module.
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Figure
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7-3.