08-16-2004 10:19 AM - edited 03-02-2019 05:47 PM
Hi,
The default configuration on CMTS is "cable upstream hopping optimized" and it could change manually to "cable upstream hopping blind".
I need to know what it mean "optimized" and to be more specific: how the CMTS select the frequency to work on after he decided to do a frequency hop.
Thanks,
Israel.
08-16-2004 01:07 PM
Frequency hopping can be configured in blind, scheduled, or intelligent(optimized) modes. The frequency is selected based on a predefined spectrum group. Scheduled frequency hopping is the simplest form, which hops at a predefined time and frequency. The difference between intelligent versus blind is that blind hopping simply marches down the spectrum group until a satisfactory frequency is found. Intelligent hopping performs look ahead of all frequency bands in the spectrum group, and hops to a clean band.
Frequency hopping decision algorithms are based on the following criteria:
CNR thresholds
Modulation switching and channel width switching
Hopping priority
FEC (correctable & uncorrectable)
These thresholds are configurable through CLI.
CNR thresholds: Its per SID and CM based CNR.
Corrected FEC: The number of correctable FEC errors, default value 3% will be applied to all cards.
Uncorrectable FEC: The number of uncorrectable FEC errors, default is 1%.
Thanks, Mak
08-17-2004 12:34 AM
Hi Mak,
thanks for the helpful answer.
can you pleas point me to a more detailed documentation on the subject.
regurds,
israel.
08-17-2004 06:04 PM
I could not find any good CCO document for this, the info that I provided is thru research into our internal engineering documents.
However if I find one will update this posting.
Thanks, Mak
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