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Making the connection to improve system performance. CPE Trouble shooting. A little background. February 10, 2009 DVAC Chapter. Skip Palinkas Product Development, PPC. Challenges for Operators. DOCSIS 3.0 implementation Upstream 32 and 64 QAM Increased high definition programming - PowerPoint PPT Presentation
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December 2008
CPE Trouble shooting
Skip PalinkasProduct Development, PPC
Making the connection to improve system performance
February 10, 2009DVAC Chapter
A little background
February 2009
Challenges for Operators1. DOCSIS 3.0 implementation
– Upstream 32 and 64 QAM
2. Increased high definition programming– Not as forgiving as Standard Definition– Is the number one quality complaint
from subscribers
3. Reduced service calls and repeats
4. Keeping ahead of the competition
5. Oh Yea, reduce cost and improve performanceAchieving these and other goals will rely on correcting a not so new issue.
February 2009
Loose F Connectors
• Approximately 35% of all installed connectors are loose
• Volume used has increased dramatically– The average home has 40-50 F connectors
inside and only 3-6 outside.
• How many of these connections are loose?– 35% average for inside and outside.– Do all loose connectors create a problem?
• Maybe not today
• Loose F connectors are a primary source of ingress and egress.
• A closer look at the problem
December 2008
A Closer look at the problem
December 2008
Loose Fitting Issues
• Service calls attributed to loose fittings
1. Digital Video Pixilation• Caused by downstream ingress• Can affect some or all QAM’s• Affects HD more than SD
2. Digital Phone quality• Audio distortions or dropped calls• Caused by Upstream ingress
3. High Speed Data• Slow speeds• Modem drops off line• Caused by Upstream ingress
December 2008
Egress Issues
Address Repaired # Days WO# Comment Repair Tech uV/m Post uV/m
Detected Cause Code
Address #1 10/8/2008 15 2324307 No Leak Found 32709 373.5 0.00
Address #2 10/8/2008 14 2325922 Loose F-Fitting at House 32709 308.5 0.00
Address #3 10/8/2008 15 2324308 Loose F-Fitting at Tap 32709 122.9 0.00
Address #4 10/8/2008 15 2324309 Loose Hard Line Connector 32709 118.6 0.00
Address #5 10/8/2008 14 2325923 Loose F-Fitting at Tap 32709 115.1 0.00
Address #6 10/8/2008 15 2324310 Loose F-Fitting at Tap 32709 111.4 0.00
Address #7 10/17/2008 24 2324314 No Leak Found 5008 73.7 -99.90
Address #8 10/21/2008 28 2324315 Defective Drop 31604 71.8 -99.90
Address #9 10/21/2008 28 2324316 Loose F-Fitting at House 31604 71.6 -99.90
Address #10 10/22/2008 29 2324318 No Leak Found 31604 67.2 -99.90
December 2008
DTV Interference
• Terrestrial digital TV is creating new issues.• 95% of digital broadcasts are in the UHF spectrum.• Interference from 1 UHF channel affects 2 QAM channels.
UHF
EIA
576-582
32 33 34 35 36 37
WPSG WYBE
83
582-588
84
588-594
85
594-600
86
600-606
87
606-612
88
576-582 582-588 588-594 594-600 600-606 606-612
December 2008
Corrective Measures
• Measurement techniques– Always verify upstream ingress– Use leakage detection
• Reinforce SOP– Ensure all connections are tight
every time, all the time
• Identify and report trouble calls generated by loose connections
December 2008
Final Comments and thoughts
• Industry will continue to launch higher modulation.• Success will depend on plant integrity.• All connections must be tight.
• The F connector was designed in the late 60’s.– While the attachment to the cable has improved, the port
interface has changed very little– Was use intended for general public?– Is it realistic to believe all connections can be made tight?
