Chapter 37: Service Class Names
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Enabling billing and other OSSs to distinguish SFs by SCN.
Simplifying the CM configuration file.
Allowing higher-layer applications to create SFs by SCN; these SCNs typically correspond to advertised levels of
subscriber service.
Quality of Service Parameters MIB
The QoS MIB defines the QoS parameters that are included in an SCN. See the table below for additional information.
For greater detail on these parameters, refer to the CableLabs document Radio Frequency Interface Specification, SP-
RFIv1.1-I07-010829, Section 8 and Appendix C.
Table 117.
QoS Parameters Included in a Service Class Name
Parameter
Keyword Syntax
Purpose
All-Flows
ServiceClassName
(SCN)
name <service class
name>
A predefined Quality of Service that is applied to a cable modem by a configuration
file and used to encode a Service Flow according to the parameter values found in
the SCN. This name is case sensitive; maximum length = 15 characters.
Priority
[priority <priority>]
Allows service flows to be given priority for delay and buffering. The C4/c CMTS
uses this field to assign traffic priorities, which are implemented using a queuing
system.
MaxTrafficRate
[max-tr-rate <value>]
This parameter is the rate parameter R of a token-bucket-based rate limit for
packets. R is expressed in bits per second. This rate expresses an upper boundary,
not a guarantee that the rate is available.
MaxTraffic Burst
[max-tr-burst <value>] Specifies the token bucket size B (in bytes) for this Service Flow.
MinReservedRate
[min-res-rate <value>]
Specifies the minimum rate, in bits/sec, reserved for this Service Flow. If CM
requests less bandwidth than this minimum, the C4/c CMTS may reallocate the
excess.