Troubleshooting DOCSIS 3 v1.ppt

7/30/2019 Troubleshooting DOCSIS 3 v1.ppt

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Confidential & Proprietary

Agenda

DOCSIS 3.0 - Why?

DOCSIS 3.0 - Features

System Considerations

Troubleshooting Process


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DOCSIS 3.0 Why?

Move from Broadcast to On-demand distribution modelPersonalized Video Services

We want to watch what we want, when we want it.

More SD and HD video services

New Internet ServicesWeb 2.0Video StreamingIncrease in home usage

More Business to Business ServicesIncrease in home base businesses

$ $ $ $ $ $


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DOCSIS 3.0 Features

Channel BondingUp to 10 channelsHigher Throughput

Expanded Upstream Freq. Range5-85 MHzS-CDMA active code selection

Enhanced ProvisioningIPv6 for CMs and CPEs

Business ServicesT1 Circuit Emulation support

Enhanced Security features

Enhanced Network management tools


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System Requirements

HeadendDOCSIS 3.0 Enabled M-CMTS or CMTSPossible change in DHCP & other servers to support IPv6Back-Office changes to support new management toolsIncrease Node segmentation

SystemNeed Downstream bandwidth for additional DOCSIS Channels

4 bonded channels (24 MHz) = 160 MbpsSpec supports max = 10 Channels

Need Upstream bandwidth for additional DOCSIS Channels4 bonded channels (24 MHz) = 120 Mbps

Customer PremiseSubscriber equipment upgrade

General

Education


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Test Procedure:Identify, Determine, Analyze, Prioritize, Resolve, Evaluate

Identify the problemWhat is the complaint?Are there other complaints in the same area?

Determine Potential CausesUse Network Management & Monitoring ToolsTruck Roll

Analyze where problem causes could exist

Prioritize potential solutions

Resolve the problems

Evaluate your results


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DOCSIS 3.0 Complaint

QuestionsIs it one customer or many?Are there any other alarms in the area? In the System?What is the capacity level in the area?Signal quality from modem

Management ToolsModem Diagnostic toolsIngress Monitoring SystemOther

Indentify



Truck Roll

Check all Downstream DOCSIS Channels firstLevels are number oneMER/BER MeasurementsEQ & Freq. Response measurements if group delay or return loss problemis suspected



Levels

Check all levels

Min test keychannels

Must check allDS DOCSISchannels



DOCSIS Levels

Bondedchannels maynot be adjacent

Typical 3 or 4chs today(10 max)

Look forinconsistencies



MER/BER Measurements

Check MER & BER on all DS DOCSISChs



EQ, Freq. Response & Group Delay

Check Freq. Response & Group delay if returnloss problem issuspected


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Cable Modem Connect

Range & RegisterProgress shown



Cable Modem Connect

Select UCD

Enabled inNetwork / CableModem Setup


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Cable Modem Connect

Errors aredisplayed inRange & RegisterProcess


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Cable Modem Connect

Completed Range & Register Process

Modem On-line

Win CE Emulator IP

MTA IP


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Cable Modem Detail

Detail CableModem Screen

DownstreamDetail

Upstream Detail


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DOCSIS 3.0 Bonded Channels

Primary DS DOCSIS Ch. carries overhead

Secondary DS Ch. carries just data

DOCSIS 2.0 test Checks Primary Channel

Upstream configured with UCD on all UpstreamsCheck performance of all US Channels independently

NOC Test ToolsBonded US Channels must be check using NOC test toolsDS Channel synchronizationUS Channel synchronization


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DOCSIS 3.0 Registration Diagram

CM acquires QAM/FEC lockof DOCSIS DS channelSYNC, UCD, MAP messages

CM performs usual USchannel selection, but doesnot start initial rangingMDD message

CM performs bonded servicegroup selection, andindicates via initial rangingB-INIT-RNG-REQ message

Usual DOCSIS initial ranging sequence

DHCP DISCOVER packet

REG-REQ message

DHCP RESPONSE packetDHCP REQUEST packetDHCP OFFER packet

CM transitions to rangingstation maintenance asusual

REG-ACK message

REG-RSP message

BPI initialization, if configured

TOD Reque st/Response messages

TFTP Request/Response messagesCM provides Rx-Chan(s)-Prof

CM receives Rx-Chan(s)-Config

CM confirms all Rx Channels

DOCSIS 3.0differencescompared toother versions


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Summary

Field point of view;It is the same RF network

System point of view:It is more complex

Use good troubleshooting procedures

Network Management Tools can help identify the problem without a

truck rollThink before you roll a truck

Use familiar DS tests to measure DS performance

Use current modem & US test methods to check US performance


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THANK YOU

From Jerry GreenSunrise Telecom, Inc.

Troubleshooting DOCSIS 3 v1.ppt

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