Chapter 21: Integrated Upstream Agility
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
672
States
Triggers
Current
Next
Num.
Definition
6
1
30
period 14400 seconds
Example 3 (Time-of-Day)
The figure below illustrates another approach. In this state machine, the MSO has determined that there are fixed times in
the day on the same day every week when noise increases in some portions of the spectrum. The MSO has also
determined that this noise seems to appear every week at the same time. Thus, the MSO decides to permit the upstream
channel to operate with a center frequency of 20 MHz from under normal conditions, and then the MSO shifts the center
frequency to 28 MHz where the channel could circumvent the expected noise that appears within the 20 MHz spectral
region during times such as 6PM to 11PM, for example, every Saturday night. Since the noise is present every week during
this time period, the MSO decides to use simple Time-of-Day triggers to force the upstream channel to operate as
described above.
Figure 88:
Example of State Diagram Using Simple Time-of-Day Triggers
