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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be modified through the use of CLI commands. To set the threshold value of a particular timer of the C4/c CMTS, issue the
CLI command:
configure packetcable pcmm timer t1 <value>
Where: <value> is the time, in deciseconds. Default = 300 deciseconds.
Note: ARRIS recommends that timers T1 be set to values other than zero to avoid unnecessary and inefficient use or
resources during busy periods.
Timer T1 — This timer limits the validity period for Authorization of a particular PCMM flow. This timer is started whenever
a Gate is established and stopped whenever a gate-set reserves resources for the PCMM flow. Ordinarily, timer T1 is
received in the Gate-Set message. If the value given in the Gate-Set message is zero, then timer T1 is set to a provisioned
value.
A Gate in the Authorized state expects the resources to be reserved. Once the C4/c CMTS receives a reserve request, it
verifies that the request is within the authorization limits established for the Gate and performs admission control
procedures. If the request is granted, the Gate transitions from Authorized to the Reserved state, and the C4/c CMTS starts
the T2 Timer.
If the Reserve request does not arrive before timer T1 expires, the C4/c CMTS deletes the Gate, and notifies the Policy
Server of the state change. If admission control succeeds, the C4/c CMTS puts the Gate in the Reserved state, stops
timer T1, and starts timer T2. If admission control procedures fail, the C4/c CMTS maintains the Gate in the Authorized
state and sends a Gate-Set-Err response to the PS.
Timer T2 — This timer limits the validity period for the Reserved state. The Policy Server may delete a Gate in the Reserved
state by issuing a Gate-Delete message. If the Commit request does not arrive before the T2 timer expires, the C4/c CMTS
deletes the Gate, stops timer T2, and notifies the Policy Server of the state change.
A Gate in the Reserved state expects the client to commit or activate resources. To commit resources, the Policy Server
issues a Gate-Set command with a Traffic Profile that includes the Committed Envelope. The C4/c CMTS again authorizes
the requested QoS against the Reserved envelope. If the authorization succeeds, the C4/c CMTS starts timer T3, and stops
timer T2 if the Authorized envelope equals the Committed envelope or restarts timer T2 if the Authorized Envelope is
greater than the Committed Envelope. If the authorization fails, the C4/c CMTS restarts timer T2.
Timer T3 — This timer limits the amount of time that the flow associated with the gate can go without passing traffic. It
corresponds to the Committed state.
