This is the MIB module for Usage Based Metering for the
DOCSIS-compliant Cable Modem Termination Systems (CMTS).
Usage Based Metering is a software feature provided in the
CMTS so that cable operators can perform subscriber
account management and metering in a uniform and
It involves the implementation of Subscriber Account
Management Interface Specification (SAMIS) as defined by
DOCSIS-OSSI specification. Usage-Based Metering is
essential in the processing of bills based on services
rendered to and consumed by paying subscribers. The SAMIS
specification focuses primarily on bandwidth centric
usage-based metering scenarios.
The DOCSIS 1.1 RFI specification provides a mechanism for
a Cable Modem (CM) to register with its Cable Modem
Termination System (CMTS) and to configure itself based
on external Quality of Service (QoS) parameters when it
is powered up or reset. The principal mechanism for
providing enhanced QoS is to classify packets traversing
the RF MAC interface into a Service Flow.
A Service Flow is a unidirectional flow of packets that is
provided a particular Quality of Service.
The mediation system can then rate the charges differently
for each of the Service Flow traffic counts based on
its Service Class. Thus, the mediation system obtains from
the CMTS the traffic counts for each named Service Flow
(identified by SFID) that a subscribers CM uses during
the metering data collection interval. The Usage Based
Metering requirement is that the CMTS must be able to
provide formatted Subscriber Usage
Metering Records for all subscribers attached to the CMTS,
on demand to an external collection system. Optionally,
the metering records can be stored locally so that it is
available via ftp to the external collection server.
The CMTS provides two configuration options to handle the
export of metering data.
Store the record locally on the CMTS after collection. The
metering system should then(operating at its own schedule)
take the file out of the CMTS and is also responsible for
deletion of the local file on the CMTS. The deletion of
the file is an indication to the metering collector to
start construction of the new metering record which will
then be written to the local filesystem and the cycle
Stream the records to an external collection system as
they get generated. The time interval in which the record
will be generated is configurable at the CMTS. A secure
and reliable stream is used to transport the metering
record out of the CMTS.
In case the connection to external metering system is
not possible, CMTS will retry establishing channel for a
max specified times.
The MIB allows for configuration of the parameters that
control the metering record collection like interval,
amount of metering information required, location or IP
address of the collection server, and metering filename.
In addition it provides for some important notificatons to
the NMS to indicate the success/failure of the