All MIBs › DOCS-IF3-MIB › docsIf3CmtsSignalQualityExtCNIR
docsIf3CmtsSignalQualityExtCNIR
Module: DOCS-IF3-MIB
OID (symbolic): DOCS-IF3-MIB::docsIf3CmtsSignalQualityExtCNIR
OID (numeric): 1.3.6.1.4.1.4491.2.1.20.1.25.1.1
Node type: OBJECT-TYPE
Type: TenthdB
Access: read-only
Description:
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.
What is docsIf3CmtsSignalQualityExtCNIR?
This object measures the signal quality on a cable modem's upstream channel by calculating the ratio of expected signal power to noise and interference present in the channel. The measurement is taken before demodulation of the actual customer modem signal, giving the CMTS a view of total channel noise conditions. Network operators use this metric to diagnose signal quality issues and determine if channel conditions are degrading due to plant problems or noise ingress.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.4491.2.1.20.1.25.1.1 snmpwalk -v2c -c public <target> DOCS-IF3-MIB::docsIf3CmtsSignalQualityExtCNIR
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.4491.2.1.20.1.25.1.1.1 snmpget -v2c -c public <target> DOCS-IF3-MIB::docsIf3CmtsSignalQualityExtCNIR.1
OID Breakdown
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | BIANCA-BRICK-PPP-MIB |
| 1.3.6 | dod | BIANCA-BRICK-PPP-MIB |
| 1.3.6.1 | internet | BIANCA-BRICK-PPP-MIB |
| 1.3.6.1.4 | private | BIANCA-BRICK-PPP-MIB |
| 1.3.6.1.4.1 | enterprises | ANIROOT-MIB |
| 1.3.6.1.4.1.4491 | cableLabs | CLAB-DEF-MIB |
| 1.3.6.1.4.1.4491.2 | clabProject | CLAB-DEF-MIB |
| 1.3.6.1.4.1.4491.2.1 | clabProjDocsis | CLAB-DEF-MIB |
| 1.3.6.1.4.1.4491.2.1.20 | docsIf3Mib | CLAB-DEF-MIB |
| 1.3.6.1.4.1.4491.2.1.20.1 | docsIf3MibObjects | DOCS-IF3-MIB |
| 1.3.6.1.4.1.4491.2.1.20.1.25 | docsIf3CmtsSignalQualityExtTable | DOCS-IF3-MIB |
| 1.3.6.1.4.1.4491.2.1.20.1.25.1 | docsIf3CmtsSignalQualityExtEntry | DOCS-IF3-MIB |
| 1.3.6.1.4.1.4491.2.1.20.1.25.1.1 | docsIf3CmtsSignalQualityExtCNIR | DOCS-IF3-MIB |