| Description | A CMTS operation entry to instruct a cable modem to move to
a new downstream and/or upstream channel.
A CMTS operator can use this to initiate an operation
in CMTS to instruct a cable modem to move to a new
downstream, or upstream channel or both.
Each entry consists of the mac address of the cable modem
to be moved, a new downstream frequency, a new upstream
channel id etc.. More than one entries could have for a
cable modem, so there is a time stamp for each entry to
show the time when this operation is initiated.
A management station wishing to create an entry should
first generate a pseudo-random serial number to be used
as the index to this sparse table. The station should
then create the associated instance of the row status
object. It must also, either in the same or in successive
PDUs, create the associated instance of the command and
parameter objects. It should also 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. Note that this entire
procedure may be initiated via a single set request which
specifies a row status of createAndGo as well as specifies
valid values for the non-defaulted parameter objects.
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 cable modem or time
out. In either case, the operation is completed.
Once the operation is completed, the real result of the
operation to the cable modem cannot be known from this
table. The result of the cable modem's downstream frequency
and the upstream channel id can be checked from other MIB
tables. For example, docsIfCmtsServiceTable from
DOCS-IF-MIB can be used to check whether the cable modem's
downstream frequency and upstream channel id are changed.
Please note that even the CMTS has generated downstream
frequency and/or upstream channel override fields in the
RNG-RSP message sent to a cable modems, if the cable modem
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. |