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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the gate. It is also stopped for a reserve operation. 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.
The default is 250 seconds.
This timer has a range of 1 to 600 seconds.
Timer T7 — The value of Timer T7 is determined by the CMS and is sent to the C4/c CMTS in a Gate-Set message along
with the rest of the authorization parameters of a call. Timer T7 corresponds to the DOCSIS 1.1 parameter, which is known
as the Timeout for Admitted QoS Parameters for the service flow. This parameter limits the period of time that the C4/c
CMTS must hold resources for a service flow's Admitted QoS Parameter Set that are in excess of its Active QoS Parameter
Set. In other words, this specifies the amount of time that reserved resources can be held without actually committing
them. If the CMS sends a value of zero to the C4/c CMTS in the Gate-Set message then the C4/c CMTS will disable the timer
for the call.
The default is 200 seconds.
Note: ARRIS recommends that timer T7 be set to a non-zero value on the CMS to avoid unnecessary resource usage
during busy periods.
Timer T8 — The value of timer T8 is determined by the CMS and is sent to the C4/c CMTS in a Gate-Set message along
with the rest of the authorization parameters of a call.
Timer T8 corresponds to the DOCSIS 1.1 parameter, which is known as the Timeout for Active QoS Parameters for the
service flow. This parameter limits the period of time resources remain unused on an active service flow. If the CMS sends
a value of zero to the C4/c CMTS in the Gate-Set message then the C4/c CMTS does not poll for activity on the service flow.
The default value of this timer is 30 seconds.
Note: ARRIS recommends that timer T8 be set to a non-zero value on the CMS. If for whatever reason the CMS fails to
release stuck flows at the end of a PacketCable call, then the C4/c CMTS automatically uses the T8 timer to decide when to
release them.
PCMM Timers
The following timers are specific to the PacketCable Multimedia protocol. The value of the timers is determined by the
Policy Server and is sent to the C4/c CMTS in a Gate-Set message along with the rest of the authorization parameters of a
call. The C4/c CMTS functions properly in most environments using the default values. In rare cases, the parameters may
