Troubleshooting guide

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 11 Element Management and MIBs
Cisco uBR7246vxr MIBs
If implemented as read-only, entries are created based on information in REG-REQ MAC
messages received from MTAs (CMTS implementation), or based on information extracted
from the TFTP option file (cable modem implementation). In the CMTS, read-only entries are
removed if no longer referenced by docsIfCmtsServiceTable.
An entry in this table must not be removed while it is referenced by an entry in
docsIfCmServiceTable (MTA) or docsIfCmtsServiceTable (CMTS).
An entry in this table should not be changeable while it is referenced by an entry in
docsIfCmtsServiceTable.
If this table is created automatically, there should only be a single entry for each Class of
Service. Multiple entries with the same Class of Service parameters are not recommended.
– The Signal Quality table (docsIfSigQ) at the CM describes the PHY signal quality of
downstream channels; at the CMTS, describes the PHY signal quality of upstream channels. At
the CMTS, this table may exclude contention intervals.
• Cable Modem Group
– The CM MAC table (docsIfCm) describes the attributes of each CM MAC interface, extending
the information available from ifEntry.
– The CM Status table (docsIfCmStatus) maintains a number of status objects and counters for
MTAs. This table is implemented only at the CM.
– The cable modem Service table (docsIfCmService) describes the attributes of each upstream
service queue on an MTA.
• CMTS Group
– The CMTS MAC table (docsIfCmts) describes the attributes of each CMTS MAC interface,
extending the information available from ifEntry. Mandatory for all CMTS devices.
– The CMTS Status table (docsIfCmtsStatus) maintains a number of status objects and counters.
– The CM Status (within CMTS) table (docsIfCmtsCmStatus) maintains status information for
each MTA connected to this CMTS. This table is implemented only at the CMTS. It contains
per CM status information available in the CMTS.
– The CMTS Service table (docsIfCmtsService) describes the attributes of upstream service
queues in a CMTS. Entries in this table exist for each ifEntry with an ifType of
docsCableMaclayer(127), and for each service queue (Service ID) within this MAC layer.
Entries in this table are created with the creation of individual Service IDs by the MAC layer
and removed when a Service ID is removed.
– The CMTS Modulation table (docsIfCmtsMod) describes a modulation profile associated with
one or more upstream channels. Entries in this table can be re-used by one or more upstream
channels. An upstream channel will have a modulation profile for each value of
docsIfModIntervalUsageCode.