Cisco OL-4015-08 Guide de dépannage télécharger pdf (Page 332)

11-8

Cisco Broadband Local Integrated Services Solution Troubleshooting Guide

OL-5169-01

Chapter 11 Element Management and MIBs

Cisco uBR7246vxr MIBs

This table extends the attributes for CMTS MAC interface. It includes attributes of the MTA

notification enabling/disabling and the interval of MTA notification sent by the CMTS for a MTA

that the Mac interface supports.

• CMTS cable modem channel override operation table (cdxCmtsCmChOver)

This table may be used to perform downstream/upstream load balancing or failure recovery. A

CMTS operator can instruct a MTA to move to a new downstream or upstream channel or both.

There can be more than one entry for a MTA, so there is a time stamp for each entry to show the

time when this operation is initiated.

Prior to creating an entry you should first generate a pseudo-random serial number to be used as the

index to this sparse table; then create the associated instance of the row status object. Also—either

in the same or in successive PDUs—create the associated instance of the command and parameter

objects; and modify the default values for any of the parameter objects if the defaults are not

appropriate.

Once the appropriate instances of all the command objects have been created, either by an explicit

SNMP set request or by default, the row status should be set to active to initiate the operation.

Once an operation has been activated, it cannot be stopped. That is, it will run until either the CMTS

has generated downstream frequency and/or upstream channel override fields in the RNG-RSP

message sent to a MTA or time out. In either case, the operation is completed.

Once the operation is completed, the real result of the operation to the MTA cannot be known from

this table. The result of the MTA's downstream frequency and the upstream channel id can be

checked from other MIB tables. For example, use docsIfCmtsServiceTable from DOCS-IF-MIB to

check whether the MTA's downstream frequency and upstream channel id are changed. Please note

that even if the CMTS has generated downstream frequency and/or upstream channel override fields

in the RNG-RSP message sent to a MTAs, if the MTA cannot lock the instructed downstream

frequency or no upstream channel id could be used, it may reconnect back to the original

downstream frequency and upstream channel id.

Once the operation completes, the management station should retrieve the values of the

cdxCmtsCmChOverState objects of interest, and should then delete the entry. In order to prevent old

entries from clogging the table, entries will be aged out, but an entry will never be deleted within 15

minutes of completing.

• CMTS cable modem table (cdxCmtsCm)

This table contains attributes or configurable parameters -- for MTAs from a CMTS.

A CMTS operator can use this table to report a MTA's attributes or configure a MTA by a MTA's

MAC address.

CMTS Upstream Group

Upstream impairment mitigation techniques are crucial to enhancing the communications reliability of

two-way HFC cable plants. The hardware and software based capabilities built in to the CMTS assist in

automatic noise mitigation.

This group contains tables in CMTS for configuring the upstream channel attributes for automated

Spectrum Management.

In addition the group also has the count of MTAs on this upstream. Separate counts are used to represent

the number of active, registered and total number MTAs on this upstream.

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Cisco OL-4015-08 Guide de dépannage Page 332

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