Troubleshooting
DOCSIS 3.0
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 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

$$$$$$
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DOCSIS 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
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System 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
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Test Procedure:
Identify, 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
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DOCSIS 3.0 Complaint
Indentify
 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
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Truck 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
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Levels
 Check all levels
 Min test key
channels
 Must check all
DS DOCSIS
channels
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DOCSIS Levels
 Bonded
channels may
not be adjacent
 Typical 3 or 4
ch’s today
(10 max)
 Look for
inconsistencies
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MER/BER Measurements
 Check MER & BER
on all DS DOCSIS
Ch’s
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EQ, Freq. Response & Group Delay
 Check Freq. Response &
Group delay if return
loss problem is
suspected
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Cable Modem Test
 Select
Downstream
Channel from List
 Enabled in
Network / Cable
Modem Setup
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Cable Modem Connect
 Range & Register
Progress shown
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Cable Modem Connect
 Select UCD
 Enabled in
Network / Cable
Modem Setup
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Cable Modem Connect
 Errors are
displayed in
Range & Register
Process
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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 Cable
Modem Screen
 Downstream
Detail
 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 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
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DOCSIS 3.0 Registration Diagram
SYNC, UCD, MAP messages
CM acquires QAM/FEC lock
of DOCSIS DS channel
MDD message
CM performs usual US
channel selection, but does
not start initial ranging
B-INIT-RNG-REQ message
CM performs bonded service
group selection, and
indicates via initial ranging
Usual DOCSIS initial ranging sequence
DHCP DISCOVER packet
CM transitions to ranging
station maintenance as
usual
DHCP OFFER packet
DHCP REQUEST packet
DHCP RESPONSE packet
TOD Request/Response messages
TFTP Request/Response messages
REG-REQ message
REG-RSP message
REG-ACK message
DOCSIS 3.0
differences
compared to
other versions
CM provides Rx-Chan(s)-Prof
CM receives Rx-Chan(s)-Config
CM confirms all Rx Channels
BPI initialization, if configured
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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
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Test Procedure:
Identify, 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?
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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 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
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THANK
YOU
From Jerry Green
Sunrise Telecom, Inc.