docsPnmCmDsOfdmMerMarTable
DOCS-PNM-MIB ·
.1.3.6.1.4.1.4491.2.1.27.1.2.6
Object
table
The purpose of this item is to provide an estimate of the MER margin
available on the downstream data channel with respect to a candidate
modulation profile. This is similar to the MER Margin reported in the
OPT-RSP Message [MULPIv3.1].
The CM calculates the Required Average MER based on the bit loading for
the profile and the Required MER per Modulation Order provided in the
RequiredDsOfdmQamMer Table. The CM then measures the RxMER per
subcarrier and calculates the Average MER for the Active Subcarriers
used in the Profile and stores the value as MeasuredAvgMer.
The CM also counts the number of MER per Subcarrier values that are
below the threshold determined by the Required MER for the Modulation
Order and the ThrshldOffset. The CM reports that value as
NumSubcarriersBelowThrshld.
This table will have a row for each ifIndex for the modem.
Context
- MIB
- DOCS-PNM-MIB
- OID
.1.3.6.1.4.1.4491.2.1.27.1.2.6- Type
- table
- Status
- current
- Parent
- docsPnmCmObjects
- Siblings
- 9
- Children
- 1
Syntax
No syntax metadata recorded.
Values & Constraints
No enumerated values or constraints recorded.
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| docsPnmCmControlObjects | node | - | .1.3.6.1.4.1.4491.2.1.27.1.2.1 |
| docsPnmCmUsPreEqTable This object provides access to CM upstream pre-equalizer coefficients.
The CM pre-equalizer coefficients and the CMTS upstream adaptive
equalizer coefficient update values, when t… | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.10 |
| docsPnmCmDsOfdmSymCapTable The purpose of downstream symbol capture is to provide partial
functionality of a network analyzer to analyze the response of the
cable plant from the CM's perspective.
… | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.2 |
| docsPnmCmOfdmChanEstCoefTable The purpose of this table is for the CM to report its estimate of the
downstream channel response. The reciprocals of the channel response
coefficients are typically used by the C… | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.3 |
| docsPnmCmDsConstDispMeasTable The downstream constellation display provides received QAM
constellation points for display. Equalized soft decisions (I and Q)
at the slicer input are collected over time, possib… | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.4 |
| docsPnmCmDsOfdmRxMerTable This item provides measurements of the receive modulation error ratio
(RxMER) for each subcarrier. Each subcarrier RxMER value consists of one
byte which represents the RxMER valu… | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.5 |
| docsPnmCmDsOfdmFecTable The purpose of the table is to provide a series of codword error rate
measurements on a per profle basis over a set period of time.
This table will have a row for each … | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.7 |
| docsPnmCmDsOfdmReqMERObjects | node | - | .1.3.6.1.4.1.4491.2.1.27.1.2.8 |
| docsPnmCmDsHistTable The purpose of the downstream histogram is to provide a measurement of
nonlinear effects in the channel such as amplifier compression and laser
clipping. For example, laser clippi… | table | - | .1.3.6.1.4.1.4491.2.1.27.1.2.9 |
Child Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| docsPnmCmDsOfdmMerMarEntry The conceptual row of the docsPnmCmDsOfdmMerMarTable. An instance
is dynamically created and exists for an associated ifIndex upon
which the test defined by this table can take pl… | row | - | .1.3.6.1.4.1.4491.2.1.27.1.2.6.1 |