Chapter 21: Integrated Upstream Agility
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 662
Limitations
These are the operational restrictions of the Upstream Agility feature:
When assigning a spectrum group to a channel, the spectrum group must include a description of the current state of
the channel. This description is the current center frequency, channel width, and mod profile of the upstream channel.
Up to 40 spectrum groups are supported per chassis
Up to 64 triggers are supported per chassis
An upstream channel can be assigned to only one spectrum group
Modifications made by Integrated Upstream Agility may have an effect on utilization-based dynamic load balancing.
For example, if the Upstream Agility feature modifies a characteristic of an upstream channel, this could increase or
decrease utilization on that upstream channel. This change in utilization may cause this channel to be load balanced
with others.
Once a state machine is assigned to an upstream channel, manual upstream channel changes cannot be made until the
association with that upstream channel has been removed.
A state machine can include up to sixteen different states. Each state is identified by a number 1-16.
The state machines defined by this feature transition between states in response to various triggers that are defined by the
system operator.
Currently the C4/c CMTS supports five kinds of triggers:
Manual triggers
Time-of-day triggers
Periodic triggers
Improvement triggers
Degradation triggers
A manual trigger is a forced state change — one that has been initiated by the operator. Manual triggers are used by the
operator to move to any state within an actively running spectrum group without waiting for other triggers that would
move the channel to that state.
Time-of-day triggers are activated by the C4/c CMTS at specific times of the day or on specified days of the week.
Periodic triggers can be set to operate at the end of a certain period of time, for example, every 14,400 seconds (four
hours).
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