MIB Viewer

docsIf3CmtsSignalQualityExtCNIR

OBJECT-TYPE
1.3.6.1.4.1.4491.2.1.20.1.25.1.1
Access
read-only
Status
current
Sub-identifiers
0
This attribute provides an upstream in-channel Carrier-to-Noise plus Interference Ratio (CNIR). CNIR is defined as the ratio of the expected commanded received signal power at the CMTS input, assuming QPSK0 modulation, to the noise plus interference in the channel. This measurement occurs prior to the point at which the desired CM signal, when present, is demodulated. The measurement includes the effect of the receive matched filter but does not include the effect of any ingress filtering. Both the signal power and noise/interference power are referenced to the same point, e.g., CMTS input.
TenthdB