BRX-XLR User Guide
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180-0145-001-R01
8.2
Impulse Noise Protection
While the BRX-XLR is very effective at mitigating the impact of longer loops and the resulting higher
signal attenuation, there are other factors that will negatively impact the performance of an xDSL loop.
Let’s examine in this section how to mitigate the impact of noisy lines by leveraging the Impulse
Noise Protection (INP) capabilities of the DSLAM and by providing proper grounding and bonding of
the equipment in the copper Outside Plant (OSP). Another symptom of a strong power influence is
when AC voltage appears on Tip-Ring or Ring-Ground or Tip-Ground. Another potential problem is
that copper pairs may not have been properly balanced. An unbalanced pair is more susceptible to
Power induction and noise.
Based on the extensive field testing of the BRX-XLR performed with Operators in very different
regions, markets and countries, it has become obvious that the Impulse Noise Protection (INP)
characteristic that is included in most DSLAMs (at least those that adhere to the G.995.3 ADSL2+
standard) can significantly help to stabilize the bandwidth delivered to subscribers, resulting in an
overall better Quality of User Experience.
For more information on this subject, please refer to Annex A, an excerpt from the Broadband Forum
TR-
176 document entitled “ADSL2Plus Configuration Guidelines for IPTV”.
