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

Figure 7-1.

Block Diagram of the 1-Port and 3-Port E1 Input Modules

Phase Measurement Averages
The Input module also 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 built
out, the Input module sends an event message to the Communications module.
The firmware running in the E1 Input module performs the following functions:
Determines module type (distinguishes between E1 and DS1 frame chips)
12713140-002-2 Revision E – October 2006
Chapter 7 Input Module Reference Data
1-Port and 3-Port E1 Input Modules
SSU-2000e User's Guide 165