All MIBs › DOCS-IFEXT2-MIB › docsIfExt2CmtsCmMscStatusEffectiveSNR
docsIfExt2CmtsCmMscStatusEffectiveSNR
Module: DOCS-IFEXT2-MIB
OID (symbolic): DOCS-IFEXT2-MIB::docsIfExt2CmtsCmMscStatusEffectiveSNR
OID (numeric): 1.3.6.1.4.1.4491.2.1.5.1.3.2.1.6
Node type: OBJECT-TYPE
Type: TenthdB
Access: read-only
Description: The signal to noise ratio estimated for this cable modem on the upstream logical channel, referenced to 64QAM modulation. It is defined as the measured SNR at the last station maintenance, minus the CM power shortfall, plus the Power Headroom, minus the constellation gain of the station maintenance burst. Note that the value of the object docsIfCmtsCmStatusSignalNoise will be identical to the value of this object when Maximum Scheduled Codes is enabled.
What is docsIfExt2CmtsCmMscStatusEffectiveSNR?
This value, in tenths of a dB, reports the SNR estimated for a cable modem's upstream channel referenced to 64QAM, computed as measured SNR minus power shortfall plus power headroom minus constellation gain, and equals docsIfCmtsCmStatusSignalNoise when MSC is enabled. An admin uses it to judge the modem's effective link quality once MSC power adjustments are accounted for, rather than the raw measured SNR alone. A CMTS operator comparing this value against the raw measured SNR for a modem can see how much MSC power tuning is compensating for a weak signal.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.4491.2.1.5.1.3.2.1.6 snmpwalk -v2c -c public <target> DOCS-IFEXT2-MIB::docsIfExt2CmtsCmMscStatusEffectiveSNR
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.4491.2.1.5.1.3.2.1.6.1 snmpget -v2c -c public <target> DOCS-IFEXT2-MIB::docsIfExt2CmtsCmMscStatusEffectiveSNR.1
Start monitoring DOCSIS cable modem/CMTS (SCDMA/MSC extension, vendor-neutral CableLabs standard) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the DOCS-IFEXT2-MIB::docsIfExt2CmtsCmMscStatusEffectiveSNR OID value, configure state conditions and alerts, and monitor any DOCSIS cable modem/CMTS (SCDMA/MSC extension, vendor-neutral CableLabs standard) from a single console.
OID Breakdown
Upper-level ancestors (10 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-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 |
| 1.3.6.1.4.1.4491.2.1.5 | docsIfExt2Mib | CLAB-DEF-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.4491.2.1.5.1 | docsIfExt2MibObjects | DOCS-IFEXT2-MIB |
| 1.3.6.1.4.1.4491.2.1.5.1.3 | docsIfExt2CmtsObjects | DOCS-IFEXT2-MIB |
| 1.3.6.1.4.1.4491.2.1.5.1.3.2 | docsIfExt2CmtsCmMscStatusTable | DOCS-IFEXT2-MIB |
| 1.3.6.1.4.1.4491.2.1.5.1.3.2.1 | docsIfExt2CmtsCmMscStatusEntry | DOCS-IFEXT2-MIB |
| 1.3.6.1.4.1.4491.2.1.5.1.3.2.1.6 | docsIfExt2CmtsCmMscStatusEffectiveSNR | DOCS-IFEXT2-MIB |