Detecting Bridged Tap and Noise Interference in VDSL2 Access Networks using the VIAVI SmartClass TPS

PublishTime：2022-10-19

◼Test Challenge: Very high-speed digital subscriber line 2 (VDSL2) provides data rates and quality of service (QoS) required for consumer broadband access and video services. It can be used on existing Access infrastructure and is a complementary technology for fiber-to-the-home (FTTH) deployments. However, upgrading the Access network from asymmetrical digital subscriber line 2+ (ADSL2+) to VDSL2 might be a more significant task in order to benefit from full VDSL2 data throughput performance and service stability. VDSL2 uses a significantly higher frequency spectrum than ADSL2+ and frequency-related issues can occur that were not present before on ADSL2+ using the same cable pair.
◼Conclusion
●Data rates associated with VDSL2 provide great market opportunities for operators and service providers, but they also increase scrutiny on the converged service when deployed incorrectly because the customer may be the first to notice diminished QoE. While VDSL2 provides significantly more bandwidth than ADSL2+, it also challenges the copper loop more because it uses a higher frequency spectrum. Copper loops that performed well for ADSL2+ may fail dramatically with full VDSL2 performance. Especially short bridged taps (between 2–50 m) can degrade VDSL2 data rates significantly.
●The graphical BPT, SNR, Hlog, and QLN diagnostic modes on the SmartClass TPS allow deeper analysis of questionable DSL data throughput performance. It enables the detection of the presence of bridged taps, including their approximate length, frequency areas of noise interference, or capacitive faults due to corroded contacts. Removing the root cause of these faults enables operators to provide a more reliable DSL line with higher data rates.

Brand of Product：	Viavi
Part#：
Product Category：	SmartClass TPS tester More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2019/7/16
Version Number：
Data Encoding：
Data Size：	526 KB

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