Troubleshooting DOCSIS 3 1 Karl Oberlin Systems Engineer

Troubleshooting DOCSIS 3. 1 Karl Oberlin Systems Engineer November 23, 2020

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1. What is DOCSIS 3. 1 and how is it different from DOCSIS 3. 0 2. Recognizing impairments 3. Troubleshooting techniques

DOCSIS 3. 1 • DOCSIS 3. 1 uses OFDM – Orthogonal Frequency Division Multiplexing – Using subcarriers that are offset by 90 degrees – 4 k mode allows for 4096 carriers when spaced 50 k. Hz – Modulation can vary

DOCSIS 3. 1 • D 3. 1 signal is made up of Pilots, PLC channel and many sub carriers • Channel width can vary from 24 MHz to 192 MHz • PLC channel is used to lock modem and provide config info • Data stream is divided up to use all carriers if needed

DOCSIS 3. 1 • PLC channel does not have to be at center frequency • PLC contains 8 BPSK pilots used to lock modem • Modem info is contained inside 400 k. Hz PLC data channel at the center of the PLC

DOCSIS 3. 1 • PLC frequency • P/V on PLC channel • Tilt • Power levels are measured in 6 MHz segments • Channel scans group segments

DOCSIS 3. 1 • Ability to make multiple MER measurements across entire channel • MER’s can be plotted as function of frequency for given channel

DOCSIS 3. 1 • PLC constellation • Plotting BPSK pilots

DOCSIS 3. 1 • Displaying profiles • Showing exclusion zones, pilots, sub carriers, modulation and PLC

Impairments Suck outs

Impairments

Impairments Tilt

Impairments Reflections

Impairments

Impairments Noise

Impairments Lower level profiles

Troubleshooting • Troubleshooting challenges • Lack of training • Lack of effective tools • Time consuming processes • Cost of equipment and repairs

Troubleshooting • Keys to effective troubleshooting – Modern tools • Meters • Monitoring tools for both forward and return plant – Proper training • At all levels – Effective program for identifying issues • Consistent methods to identify problems