docsPnmCmtsDsOfdmNoisePwrRatioTable

The purpose of downstream NPR measurement is to view the noise,
interference and intermodulation products underlying a portion of the
OFDM signal. As an out-of-service test, the CMTS can define an exclusion
band of zero-valued subcarriers which forms a spectral notch in the
downstream OFDM signal for all profiles of a given downstream channel.
The CM provides its normal spectral capture measurements, or symbol
capture, which permit analysis of the notch depth. A possible use case
is to observe LTE interference occurring within an OFDM band; another
is to observe intermodulation products resulting from signal-level
alignment issues. Since the introduction and removal of a notch affects
all profiles, causing possible link downtime, this feature is intended
for infrequent maintenance.

MIB

DOCS-PNM-MIB

OID

.1.3.6.1.4.1.4491.2.1.27.1.3.2

Type

table

Status

current

Parent

docsPnmCmtsObjects

Children

1