All MIBs › DOCS-IF31-MIB › docsIf31CmUsOfdmaChanRollOffPeriod
docsIf31CmUsOfdmaChanRollOffPeriod
Module: DOCS-IF31-MIB
OID (symbolic): DOCS-IF31-MIB::docsIf31CmUsOfdmaChanRollOffPeriod
OID (numeric): 1.3.6.1.4.1.4491.2.1.28.1.13.1.8
Node type: OBJECT-TYPE
Type: UsOfdmaRollOffPeriod
Access: read-only
Description: Windowing is applied in order to maximize channel capacity by sharpening the edges of the spectrum of the OFDMA signal. Windowing is applied in the time domain by tapering (or rolling off) the edges using a raised cosine function. There are eight possible values of roll-off prefix. The Roll-Off Period is given in us and in number of samples using the sample rate of 102.4 Msamples/s. The configuration where Roll-off prefix value is greater than or equal to cyclic prefix value is considered invalid.
What is docsIf31CmUsOfdmaChanRollOffPeriod?
Reports, in number of samples (at a 102.4 Msamples/s sample rate), the roll-off period windowing applied to this OFDMA upstream channel's signal, which sharpens spectral edges via a raised-cosine taper; DOCSIS 3.1 defines eight possible values, and a configuration where the roll-off period is greater than or equal to the cyclic prefix is considered invalid. Admins generally don't tune this directly but can use it to sanity-check that the CMTS's channel configuration is internally consistent (roll-off strictly less than cyclic prefix).
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.4491.2.1.28.1.13.1.8 snmpwalk -v2c -c public <target> DOCS-IF31-MIB::docsIf31CmUsOfdmaChanRollOffPeriod
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.4491.2.1.28.1.13.1.8.1 snmpget -v2c -c public <target> DOCS-IF31-MIB::docsIf31CmUsOfdmaChanRollOffPeriod.1
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OID Breakdown
Upper-level ancestors (9 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 |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.4491.2.1.28 | docsIf31Mib | DOCS-IF31-MIB |
| 1.3.6.1.4.1.4491.2.1.28.1 | docsIf31MibObjects | DOCS-IF31-MIB |
| 1.3.6.1.4.1.4491.2.1.28.1.13 | docsIf31CmUsOfdmaChanTable | DOCS-IF31-MIB |
| 1.3.6.1.4.1.4491.2.1.28.1.13.1 | docsIf31CmUsOfdmaChanEntry | DOCS-IF31-MIB |
| 1.3.6.1.4.1.4491.2.1.28.1.13.1.8 | docsIf31CmUsOfdmaChanRollOffPeriod | DOCS-IF31-MIB |