Status in source: current.
Technical details
{
"smi_kind": "OBJECT-TYPE",
"definition": [
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"\"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, possibly subsampling to reduce complexity, and made available for analysis. This measurement is intended for data subcarriers only. Up to 8192 samples are provided for each query; additional queries can be made to further fill in the plot. The complex Constellation Display values are expressed as 16 bit two's complement numbers using s2.13 format. The CM samples are scaled such that the average power of the QAM constellation is approximately 1, in order to avoid excessive clipping and quantization noise. The object controls the CM capturing and reporting of received soft-decision samples, for a single selected constellation from the set of profiles it is receiving, within a single OFDM downstream channel. This table will have a row for each ifIndex for the modem. \"",
"REFERENCE",
"\"DOCSIS 3.1 Cable Modem Operations Support System Interface Specification CM-SP-CM-OSSIv3.1, PNM section.\"",
"::=",
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[
"DESCRIPTION",
"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, possibly subsampling to reduce complexity, and made available for analysis. This measurement is intended for data subcarriers only. Up to 8192 samples are provided for each query; additional queries can be made to further fill in the plot. The complex Constellation Display values are expressed as 16 bit two's complement numbers using s2.13 format. The CM samples are scaled such that the average power of the QAM constellation is approximately 1, in order to avoid excessive clipping and quantization noise. The object controls the CM capturing and reporting of received soft-decision samples, for a single selected constellation from the set of profiles it is receiving, within a single OFDM downstream channel. This table will have a row for each ifIndex for the modem."
],
[
"REFERENCE",
"DOCSIS 3.1 Cable Modem Operations Support System Interface Specification CM-SP-CM-OSSIv3.1, PNM section."
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}