Technical information

Cuda 12000 IP Access Switch CudaView Administration Guide
Configuring Upstream Channels 505
About Frequency Hopping (Spectrum Group)
Frequency Hopping provides you with the ability to continuously monitor the
quality of the upstream spectrum that is in use to avoid unacceptable error
rates due to noise. When the plant quality degrades to an unacceptable
level, the operating parameters of the tuned upstream adjusts based on the
policy configuration.
The quality of the channel is measured using spectrum quality indicators
based on frame error rate. The frame error rate is determined by monitoring
the pre and post Forward Error Correction (FEC) rates. The frame error rate is
averaged over an amount of time and compared to a configured threshold.
When the threshold is exceeded, the currently tuned upstream is considered
a degraded spectrum and a decision is made based on the policy for this
channel.
Configuring Frequency Hopping
Before you configure frequency hopping, you need to determine to which
already configured modulation profile to set the configuration, or, you first
need to configure a modulation profile to which you want to configure
frequency hopping.
The Cuda 12000 allows you to configure a threshold that is used to
determine when the upstream spectrum has degraded to an unacceptable
level. This error threshold is a percentage of frames received in error in
comparison to the total number of frames received. If FEC is used, then
frames in error is the number of pre and post FEC errors. If FEC is not being
used, then the number of frames in error is the number of invalid frames
received. This error threshold is averaged over an amount of time. When the
error threshold is exceeded, the upstream spectrum is considered
Microreflections Total microreflections, including in-channel response as
perceived on this upstream channel.
Signal-to-Noise
Ratio (dB)
Average signal-to-noise ratio (SNR) on this upstream channel.
Equalization
Data
Equalization data should read zero.
Parameter Description