Chapter 21: Integrated Upstream Agility
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
670
Example 2 (Periodic)
The figure below illustrates another way to configure the Upstream Agility state machine. In this approach, the MSO
combines temporal triggers and channel condition triggers. In particular, degradation triggers are used to push the state
machine from its default state (State 1) down to the state with the highest theoretical throughput that yields an acceptable
PER performance. The state machine will operate at this level until a periodic trigger pushes the state machine back to the
default state (State 1) so that it can again sample the different states until it again finds the state with the highest
theoretical throughput that yields an acceptable PER performance. As an example, the periodic trigger might be a timer
that fires once every 4 hours (14,400 seconds). Thus, the state machine will operate in a particular state for about 4 hours,
at which point the state machine resets to the default state (State 1) and repeats its operation.
Figure 87:
State Diagram Using Degradation and Periodic Triggers (Example)
