troubleshooting docsis 3.0

Troubleshooting Troubleshooting DOCSIS 3.0DOCSIS 3.0

Confidential & Proprietary

AgendaAgenda

DOCSIS 3.0 - Why?

DOCSIS 3.0 - Features

System Considerations

Troubleshooting Process


DOCSIS 3.0 – Why?DOCSIS 3.0 – Why?

Move from Broadcast to On-demand distribution model Personalized Video Services

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

More SD and HD video services

New Internet Services Web 2.0 Video Streaming Increase in home usage

More Business to Business Services Increase in home base businesses

$ $ $ $ $ $


DOCSIS 3.0 FeaturesDOCSIS 3.0 Features

Channel Bonding Up to 10 channels Higher Throughput

Expanded Upstream Freq. Range 5-85 MHz S-CDMA active code selection

Enhanced Provisioning IPv6 for CM’s and CPE’s

Business Services T1 Circuit Emulation support

Enhanced Security features

Enhanced Network management tools


System RequirementsSystem Requirements

Headend DOCSIS 3.0 Enabled M-CMTS or CMTS Possible change in DHCP & other servers to support IPv6 Back-Office changes to support new management tools Increase Node segmentation

System Need Downstream bandwidth for additional DOCSIS Channels

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

Need Upstream bandwidth for additional DOCSIS Channels 4 bonded channels (24 MHz) = 120 Mbps

Customer Premise Subscriber equipment upgrade

General Education


Test Procedure:Test Procedure:

Identify, Determine, Analyze, Prioritize, Resolve, EvaluateIdentify, Determine, Analyze, Prioritize, Resolve, Evaluate

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

Determine Potential Causes Use Network Management & Monitoring Tools Truck Roll

Analyze where problem causes could exist

Prioritize potential solutions

Resolve the problems

Evaluate your results


DOCSIS 3.0 Complaint DOCSIS 3.0 Complaint

Questions Is 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 Tools Modem Diagnostic tools Ingress Monitoring System Other

Indentify


Truck RollTruck Roll

Check all Downstream DOCSIS Channels first Levels are number one MER/BER Measurements EQ & Freq. Response measurements if group delay or return loss problem

is suspected


LevelsLevels

Check all levels

Min test key channels

Must check all DS DOCSIS channels


DOCSIS LevelsDOCSIS Levels

Bonded channels may not be adjacent

Typical 3 or 4 ch’s today (10 max)

Look for inconsistencies


MER/BER MeasurementsMER/BER Measurements

Check MER & BER on all DS DOCSIS Ch’s


EQ, Freq. Response & Group DelayEQ, Freq. Response & Group Delay

Check Freq. Response & Group delay if return loss problem is suspected


Cable Modem TestCable Modem Test

Select Downstream Channel from List

Enabled in Network / Cable Modem Setup


Cable Modem ConnectCable Modem Connect

Range & Register Progress shown



Select UCD

Enabled in Network / Cable Modem Setup



Errors are displayed in Range & Register Process



Completed Range & Register Process

Modem On-line

Win CE Emulator IP

MTA IP


Cable Modem DetailCable Modem Detail

Detail Cable Modem Screen

Downstream Detail

Upstream Detail


DOCSIS 3.0 Bonded ChannelsDOCSIS 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 Upstreams Check performance of all US Channels independently

NOC Test Tools Bonded US Channels must be check using NOC test tools DS Channel synchronization US Channel synchronization


DOCSIS 3.0 Registration DiagramDOCSIS 3.0 Registration Diagram

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

CM performs usual US channel selection, but does not start initial rangingMDD message

CM performs bonded service group selection, and indicates via initial rangingB-INIT-RNG-REQ message

Usual DOCSIS initial ranging sequence

DHCP DISCOVER packet

REG-REQ message

DHCP RESPONSE packet

DHCP REQUEST packet

DHCP OFFER packet

CM transitions to ranging station maintenance as usual

REG-ACK message

REG-RSP message

BPI initialization, if configured

TOD Request/Response messages

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

CM receives Rx-Chan(s)-Config

CM confirms all Rx Channels

DOCSIS 3.0 differences compared to other versions


Cable Modem Test Cont.Cable Modem Test Cont.

Perform Modem test for all DS Ch’s Will not include Secondary Bonded Channels

All US Ch’s Will only include Ch’s with UCD’s

Look at node ingress monitor

NOC Network Management tools can give you the rest of the info


Test Procedure:Test Procedure:

Identify, Determine, Analyze, Prioritize, Resolve, EvaluateIdentify, Determine, Analyze, Prioritize, Resolve, Evaluate

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

Determine Potential Causes Use Network Management & Monitoring Tools

Analyze where problem causes could exist Think before you run

Prioritize potential solutions What is the most likely cause?

Resolve the problems

Evaluate your results Did this solve the problem, or is something else broken?


SummarySummary

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 roll Think before you roll a truck

Use familiar DS tests to measure DS performance

Use current modem & US test methods to check US performance

THANK THANK YOUYOU

From Jerry GreenSunrise Telecom, Inc.

troubleshooting docsis 3.0

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