Configured Versus Actual Rate; Impulse Noise Protection (Inp); Upbo - ZyXEL Communications MSC1024G Series User Manual

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11.2.5 Configured Versus Actual Rate

You configure the maximum rate of an individual VDSL port by modifying its profile (see the

VDSL Profile Setup screen) or assigning the port to a different profile (see the Port Setup

screen). However, the actual rate varies depending on factors such as transmission range and

interference.

Short impulses from external sources may cause bursts of errors which could impact the

multimedia (ex. voice, video, or picture) quality. VDSL2 supports impulse noise protection

(INP) which provides the ability to correct errors regardless of the number of errors in an

errored DMT (Discrete Multi-Tone) symbol.

In a network with varying telephone wiring lengths, the PSD on each line is different. This

causes crosstalk between the lines. Enable UPBO (Upstream Power Back Off) to allow the

device to adjust the transmit PSD of all lines based on a reference line length. This mitigates

the upstream crosstalk on shorter loops to longer loops. It allows the switch to provide better

service in a network environment with telephone wiring of varying lengths.

An example is shown below. Line 1 and Line 2 are in the same cable binder. Crosstalk occurs

when the signal flows and is near to CPE (A)'s location. Besides, higher Line 1 PSD causes

higher interference to the Line 2. CO receives signal with higher attenuation. With UPBO

enabled on the CPE (A), it decreases the PSD level and reduces the crosstalk impact on long

Figure 124 UPBO Resolves Upstream Far-End Crosstalk

MSC1000G/1024G/1224G Series User's Guide

Chapter 11 Subscriber Port Setup Screens

Line2 (600m)

Line1 (150m)

Msc1224g series Msc1000g series