Additional objects for docsIfCmtsServiceTable entry including
downstream traffic statistics and excess counts against the
Quality of Service limits for each Service ID.
From DOCSIS 1.1 onwards statistics are maintained for each
Service Flow(instead of the Service ID) in the DOCS-QOS-MIB
in docsQosServiceFlowStatsTable objects. For Cable modems
not running in DOCSIS 1.0 mode, the objects
cdxIfCmtsServiceOutOctets and cdxIfCmtsServiceOutPackets
will only support primary service flow.