Functional Block Diagram; Block Diagram Of The 1-Port And 3-Port E1 Input Modules - Symmetricom SSU-2000 User Manual

Functional Block Diagram

A simplified block diagram of the 1- and 3-Port E1 Input module is shown in
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 build-out
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 built out, the Input module sends an event message to the
Communications module.
12713020-002-2 Revision F.01 – January 2007
Chapter 7 Input Module Reference Data
1-Port and 3-Port E1 Input Modules
SSU-2000 User's Guide 161
Figure