Chapter 28: PacketCable™ Services and Voice Applications
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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In the Committed state, the Application Manager may delete the Gate by issuing a Gate-Delete message to the Policy
Server, which in turn relays the message to the C4/c CMTS. The C4/c CMTS then deletes the Gate and the corresponding
Service Flow, and stops timers T2 and T3 if they are running.
If the C4/c CMTS detects that the flow is unused for a time in excess of the T3 timer, the C4/c CMTS notifies the Policy
Server that the service-flow associated with the gate has been unused, starts the T4 timer, and transitions the Gate to the
Committed-Recovery state.
Timer T4 — This timer limits the amount of time the Gate can spend in the Committed-Recovery state.
In the Committed state the flow associated with the Gate is active. If the C4/c CMTS detects that the flow is unused for a
time in excess of the T3 timer, the C4/c CMTS notifies the Policy Server (which notifies the Application Manager) that the
service-flow associated with the gate has been unused, starts the T4 timer and transitions the Gate to the Committed-
Recovery state. (Note: If the T2 timer is running it will continue running.) The AM must decide either to refresh the policy
by issuing a Gate-Set message to the PS or delete the Gate by issuing a Gate-Delete message to the PS. The Policy Server
forwards the Gate-Set message or Gate-Delete message to the C4/c CMTS.
Note: If the Gate is in the committed state and timer T4 equals zero, then the C4/c CMTS deletes the Gate and notifies
the PS when timer T3 expires.
If, while in the Committed-Recovery state, the C4/c CMTS receives a Gate-Set message for the Gate before the timer T4
expires, then the C4/c CMTS stops the T4 timer, restarts the T3 timer, transitions the Gate back to the Committed state,
and starts or restarts the T2 timer if the Reserved Envelope is greater than the Committed Envelope. If T2 timer is running
and the new Reserved Envelope is equal to the Committed Envelope, then the C4/c CMTS stops the T2 timer.
If, while in the Committed-Recovery state, the C4/C4c CMTS receives a Gate-Delete message before the timer T4 expires,
then the C4/c CMTS stops the T4 Timer, deletes the Gate and the corresponding service flow, and stops the T2 timer if
necessary.
If timer T4 simply expires while the Gate is in the Committed-Recovery state, then the C4/c CMTS sends a Gate-Report-
State message to the PS, stops timer T2 if it is running, tears down the service flow associated with the Gate, and then
deletes the Gate. The Policy Server notifies the Application Manager of the state change.
More details are available in the latest PacketCable™ Multimedia Specification in Section 6.2 under Gate transitions.
