Audio Note CONQUEROR Silver Signature Low Gain Informacje Techniczne Pobierz pdf

Application Note

WEBSITE: www.jdsu.com

Using JDSU Equipment to Test and Troubleshoot CPD,

Impulse Noise, and Ingress in the Return Path

History of CPD

• Common Path Distortion (CPD) is created by non-linear mixing from a diode junction created by corrosion

and dissimilar metal contacts. It’s not just dissimilar metals, but dissimilar metal groups. ere are 4 main

groups of metals:

1. Magnesium and its alloys,

2. Cadmium, Zinc, Aluminum and its alloys,

3. Iron, Lead, Tin, & alloys (except stainless steel), and

4. Copper, Chromium, Nickel, Silver, Gold, Platinum, Titanium, Cobalt, Stainless Steel, and Graphite.

• CPD is second and third order intermods from the forward channels intermixing and creating distortions,

which fall everywhere. CPD will make CSO/CTB worse for forward performance.

• Separation depends on forward channel plan. NCTA, HRC, and IRC plans that use NTSC, 6 MHz spacing

will have beats every 6 MHz. PAL could be every 7 or 8 MHz.

• e original culprit was the old feed-through connectors. Dissimilar metals from the copper clad, aluminum center

conductor and the stainless steel seizure screw.

1 2 3 4 5 6

Podsumowanie treści

Strona 1 - History of CPD

Application Note WEBSITE: www.jdsu.comUsing JDSU Equipment to Test and Troubleshoot CPD, Impulse Noise, and Ingress in the Return PathHistory of CPD•

Strona 2 - Tracking Down Ingress

Application Note: Return Path Troubleshooting2• Housing terminators are notorious now because of the higher levels to mix and intermodulate, not t

Strona 3 - The “Noise” Mode

Application Note: Return Path Troubleshooting3A single source of interference is easy to track down. If it’s constant, just use the “divide and conq

Strona 4 - Impulse Noise

Application Note: Return Path Troubleshooting4• e ﬁeld unit has a “noise/ingress” feature, which can be used for troubleshooting. is displays th

Strona 5 - Why Measure Cable Modem C/N?

Application Note: Return Path Troubleshooting5Reverse ingress spectrum trace after 6 s. with dwell-time = 20 ms.The “Zero Span” Mode• In this mode

Strona 6

All statements, technical information and recommendations related to the products herein are based upon informa-tion believed to be reliable or accura

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