12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 145
Input Module Reference Data
1-Port and 3-Port E1 Input Modules
Functional Block Diagram
A simplified block diagram of the 1- and 3-Port E1 Input module is shown in Figure
7-1.
Figure 7-1. Block Diagram of the 1-Port and 3-Port E1 Input Modules
Phase Measurement Averages
The Input module maintains averages of past phase measurements including:
7000 100-second averages
700 1000-second averages
70 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 with phase jumps, the phase build
out algorithm does not build out more than eight consecutive samples. If the phase
is build out, the Input module sends an event message to the Communications
module.
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