dcxFftSize
ARRIS-CMTS-FFT-MIB ·
.1.3.6.1.4.1.4115.1.4.5.1.1.1.1.1
Object
column
r/w
Unsigned32
Number of samples to be collected for FFT. Valid values are 256, 512, 1024, 2048, 4096. The FFT payload size will be the number of samples multiplied by the number of bytes per sample as determined by dcxFftOutputFormat. The duration of the FFT sample will be the number of samples divided by the sample rate as determined by dcxFftSampleRate.
Context
- MIB
- ARRIS-CMTS-FFT-MIB
- OID
.1.3.6.1.4.1.4115.1.4.5.1.1.1.1.1- Type
- column
- Access
- readwrite
- Status
- current
- Parent
- dcxFftUpstreamChannelEntry
- Table
- dcxFftUpstreamChannelTable
- Siblings
- 15
Syntax
Unsigned32
Values & Constraints
Object Constraints
range: 256-256
range: 512-512
range: 1024-1024
range: 2048-2048
range: 4096-4096
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| dcxFftBurstIUC IUC type on which to trigger the FFT process. This
object is used only if dcxFftOperatingMode is set
to burstSpectrum or periodicSpectrum. A value of 0
means trigger on any IUC … | column | Integer32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.10 |
| dcxFftLogicalChannel Logical channel on which to trigger the FFT process.
This object is used only if dcxFftOperatingMode is
set to periodicSpectrum. A value of -1 means trigger
on any logical channel. | column | Integer32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.11 |
| dcxFftTriggerCount Number of times to trigger FFT when dcxFftEnable and
dcxFftApplyConfig are set to true. Set this object to
zero to trigger FFT continuously. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.12 |
| dcxFftEnable Set to true to enable FFT on this channel. Set to false to
disable. Setting will take effect when dcxFftApplyConfig is
set to true | column | SNMPv2-TCTruthValue | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.13 |
| dcxFftApplyConfig Set to true to trigger an FFT process with configuration
determined by the other objects in this group. An SNMP GET
of this object will always return false | column | SNMPv2-TCTruthValue | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.14 |
| dcxFftInProgress This object will return true if an FFT process is currently
in progress (having been started by a SET to dcxFftApplyConfig)
for this upstream channel. Returns false otherwise | column | SNMPv2-TCTruthValue | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.15 |
| dcxFftCurrentTriggers Number of FFT triggers since the last FFT process was
started. | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.16 |
| dcxFftSampleRate FFT sample rate based on the input source to the FFT. The input to the FFT
can be the ADC output, the ADC output followed by a down-mixer and half-band
filter, the ADC output foll… | column | Enumeration | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.2 |
| dcxFftCentreFrequency FFT centre frequency. This object is used only if dcxFftSampleRate is set
to halfAdcRate or quarterAdcRate to set the down-mixer frequency. | column | hertz Integer32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.3 |
| dcxFftWindowing Set the frequency-domain windowing filter. | column | Enumeration | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.4 |
| dcxFftLogAveragingTimeConstant Time averaging constant exponent, M. Constant is
2^M. Setting this object to zero disables averaging. | column | Unsigned32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.5 |
| dcxFftOutputFormat FFT processor output format. Format can be i. raw complex
time-domain I/Q format ii. FFT data in I/Q format iii. FFT
data in power format iv. FFT data in amplitude format. The
sa… | column | Enumeration | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.6 |
| dcxFftOperatingMode Operating mode of FFT process. Determines whether
the FFT measurement takes place while no CMs are
transmitting (measuring noise floor), during a CM
burst, or by periodically sam… | column | Enumeration | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.7 |
| dcxFftIdleInterval Interval in microseconds between consecutive FFT
triggers when dcxFftOperatingMode is baseSpectrum
or periodicSpectrum. This object is not used if
dcxFftOperatingMode is set to bu… | column | SNMPv2-SMIUnsigned32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.8 |
| dcxFftBurstSid SID on which to trigger the FFT process. This
object is used only if dcxFftOperatingMode is set
to burstSpectrum. | column | Unsigned32 | .1.3.6.1.4.1.4115.1.4.5.1.1.1.1.9 |