Troubleshooting DOCSIS 3.0
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Transcript Troubleshooting DOCSIS 3.0
Troubleshooting
DOCSIS 3.0
Agenda
DOCSIS 3.0 - Why?
DOCSIS 3.0 - Features
System Considerations
Troubleshooting Process
Confidential & Proprietary
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
$$$$$$
Confidential & Proprietary
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
Confidential & Proprietary
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
Confidential & Proprietary
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
Confidential & Proprietary
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
Confidential & Proprietary
MER/BER Measurements
Check MER & BER
on all DS DOCSIS
Ch’s
Confidential & Proprietary
EQ, Freq. Response & Group Delay
Check Freq. Response &
Group delay if return
loss problem is
suspected
Confidential & Proprietary
Cable Modem Test
Select
Downstream
Channel from List
Enabled in
Network / Cable
Modem Setup
Confidential & Proprietary
Cable Modem Connect
Range & Register
Progress shown
Confidential & Proprietary
Cable Modem Connect
Select UCD
Enabled in
Network / Cable
Modem Setup
Confidential & Proprietary
Cable Modem Connect
Errors are
displayed in
Range & Register
Process
Confidential & Proprietary
Cable Modem Connect
Completed Range &
Register Process
Modem On-line
Win CE Emulator IP
MTA IP
Confidential & Proprietary
Cable Modem Detail
Detail Cable
Modem Screen
Downstream
Detail
Upstream Detail
Confidential & Proprietary
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
Confidential & Proprietary
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
Confidential & Proprietary
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
Confidential & Proprietary
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?
Confidential & Proprietary
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
Confidential & Proprietary
THANK
YOU
From Jerry Green
Sunrise Telecom, Inc.