ZyXEL Communications VES1724-56 - Page 120

Chapter 9 VDSL Setup
VES1724-56 User’s Guide
120
the start of the next cluster. The Eq_INP histogram shows the level of INP required to prevent data
errors and the IAT histogram shows time intervals between the impulse noise events.
Figure 64 Impulse Noise Monitor Setup
The following table describes the labels in this screen.
Table 42 Impulse Noise Monitor Setup
LABEL DESCRIPTION
Name Enter a descriptive name for identification purposes.
NearEnd The parameters in this column relate to upstream transmissions.
FarEnd The parameters in this column relate to downstream transmissions.
InpEqMode Select the way of computating equivalent INP in this profile. See ITU-T G.993.2 for more
information.
0: In this mode, the INMCC value is 0 and the cluster length (the number of data symbols
from the first to the last severely degraded data symbols in a cluster) is used to generate
the histogram. Each set of consecutive severely degraded data symbols is considered as a
separate impulse noise event.
1: In this mode, the specified INMCC value and cluster length are used to generate the
histogram. This provides an upper bound on the level of the required INP.
2: In this mode, the specified INMCC value and the number of the severely degraded data
symbols in a cluster are used to generate the histogram. This provides a lower bound on
the level of the required INP.
3: In this mode, the specified INMCC value, cluster length, the number of the severely
degraded data symbols in a cluster and the number of gaps in a cluster are used to
generate the histogram. This provides the best estimate of the required INP level.
INMCC Specify the cluster continuation value (0 to 64 DMT symbols) used for INM cluster
indication.