| Description | A conceptual row of this table.
QAM channels are modeled as PhysicalClass 'port' from
the ENTITY-MIB.
An QAM channel can be represented as part of an entity
MIB containment tree as follows:
chassis(device)
.container(Slot)
.module(field-replaceable-module)
.module ( Physical RF spigot)
. port (QAM channel)
PhysicalClass 'stack' is left optional and not included
as a reference or examples for this table.
Based on the hardware capabilities the Agent will create
entries in this table including the entPhysicalEntry of
the close element to the root (e.g., up to 'chassis' or
'stack') including the PHY parameter of the dependency
as part of the entry index
The Aggregation is then defined as all the QAM channels
(entity PhysicalClass = 'port') below the tree as
indicated in entyPhysicalContainsTable.
Logical or software dependencies of the QAM channels PHY
parameters in addition to the hardware dependency entries
can be present and MUST persist during system
re-initialization. The storage realization of hardware
dependent entries are 'permanent' or 'readOnly'. The
storage realization of logical dependency entries is
'nonVolatile'.
PHY parameter dependencies that are logically defined may
be present in this table but its configuration is outside
of the scope of this MIB Module, including the definition
of simulated Physical components such backplane types or
modules accomplish its logical grouping.
PHY parameters with no Physical entities associated in
this table indicate no PHY dependencies for certain groups
of QAM channels.
Administrative changes to the
docsDrfGroupDependencyPhyParamLock are preserved in
non-volatile memory upon system re-initialization.
Note that any change in the system due to the
insertion or removal or components will reset to factory
default the entries associated with those components.
An entry in this table is reflected in the MIB object
docsIfMExtDownstreamTSIDGroupPhyParamFlag for individual
QAM channels.
A recursive method to find the PHY dependency group of an
QAM channel A, PHY parameter X is as follows:
The parent tree of QAM channel A is recursively calculated
by navigating entyPhysicalContainsTable from bottom to top
Pi(P1..Pn)
The list Mj (M1..Mn) of
docsDrfGroupDependencyPhysicalIndex represents the
values from this table with PHY parameter
docsDrfGroupDependencyPhyParam X and/or 'all'
The list Qi (Q1..n) is the list of matches of Mi in Pi
Qi with the lower position in the entyPhysicalContainsTable
is selected Qy and My is the group criteria selected.
All QAM channels Bi below My are candidates for inclusion
in the dependency group.
Each Bi is verified as A for its own BPi parent tree to
verify that in effect My is the lowest denominator in Mi
BPi intersection to become part of the Dependency Group
of A. |