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Recommended parameter values for HSI:
Basic DSL Port Parameters
Path
Latency
Specifies the operating mode of the primary channel.
fast – for delay sensitive applications like voice and online gaming. Specifies
a minimum of 4 ms delay.
interleaved – interleaves DSL frames to optimize error protection in the
presence of impulse noise sources that are common to DSL. Specifies a
delay greater than or equal to 5 ms.
For HSI with no IPTV, Calix recommends the "fast" setting in both upstream
and downstream directions.
Max Rate Defines maximum downstream or upstream of rate for xDSL port (Kb/s, or
use "m" suffix for Mb/s).
For HSI, Calix recommends a value equal to or slightly greater than the
minimal bitrate required to support the corresponding service.
Max SNR Defines the maximum downstream or upstream signal-to-noise ratio (SNR)
margin (dB, in 0.1 dB increments) defines the amount of margin above target
SNR that must be present before power cutback occurs.
For HSI, Calix recommends an additional 5 dB of margin above target SNR
before power cutback is allowed. This corresponds to a maximum SNR margin
of 10 dB for supporting HSI.
Advanced DSL Port Parameters
DS or US
downshift
rate
adaptation
margin
Defines an SNR margin below the Target SNR Margin that triggers a bitrate
"downshift" (dB, in 0.1 dB increments). For the decrease to occur, the noise
margin must stay below this value for the time specified in upstream or
downstream Downshift Rate Adaptation Time. Applies only when dynamic
rate adaptation is specified.
For ADSL2 applications, Calix recommends a value of 3 dB below target for
both upstream and downstream directions.
For VDSL2 applications, Calix recommends a value of 5 dB below target for
both upstream and downstream directions.
DS or US
upshift rate
adaption
margin
Defines an SNR margin above the Target SNR Margin which, when exceeded,
initiates a bitrate "upshift" (dB, in 0.1 dB increments). For the increase to
occur, the noise margin must stay above this value for the time specified in
upstream or downstream Upshift Rate Adaptation Time. Applies only when
dynamic rate adaptation is specified.
For IPTV, Calix recommends a value of 3 dB above target for both
upstream and downstream directions.
For HSI, Calix recommends a value of 1 dB above target for both upstream
and downstream directions.
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