Chapter 9 VDSL Setup
VES1724-56 User’s Guide
119
9.3.9 VDSL INM Profile Setup
Click the InmProfile link at the top-right corner of the VDSL Template Setup screen to open the
screen shown below.
In Impulse Noise Monitoring (INM), a cluster contains one or more groups of one single or
consecutive severely degraded data symbols caused by impulse noise. Each cluster starts and ends
with a severely degraded data symbol. Groups in a cluster are separated by a gap. A gap is a group
of non-severely degraded data symbols between two severely degraded data symbols. Gaps
between the groups in a cluster are smaller then or equal to the specified INM Cluster Continuation
(INMCC). Gaps between the clusters are greater than the specified INMCC.
Figure 63 INM Cluster Example
Use this screen to view, add, modify and delete VDSL INM profiles. An INM profile defines the
control parameters used to generate the Equivalent INP (Eq INP or INP_Eq) and Inter-Arrival Time
(IAT) histograms. The IAT represents the number of data symbols from the start of one cluster to
REIN Config Specify the major REIN (Repetitive Electrical Impulse Noise) with how many consecutive
DMT symbols long and the operating frequency (100 or 120 Hz) in your territory. The
Switch can completely correct the impulse noise by using the retransmission function.
Modify Click Modify to save the new settings to the Switch.
Cancel Click Cancel to reset the fields to your previous configuration.
Clear Click Clear to clear the fields to the factory defaults.
Table 41 VDSL Channel Profile Setup > G.INP (continued)
LABEL DESCRIPTION
Gap
(> INMCC)
Gap
(> INMCC)
Gap
(> INMCC)
Cluster
Gap
Severely Degraded Data Symbol(s) Group
Gap ( ≦ INMCC)
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