ZyXEL VES1724-56 User Guide - Page 121
VDSL INM Profile Setup
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Chapter 9 VDSL Setup Table 36 VDSL Channel Profile Setup > G.INP (continued) LABEL REIN Config Modify Cancel Clear DESCRIPTION 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. Click Modify to save the new settings to the Switch. Click Cancel to reset the fields to your previous configuration. Click Clear to clear the fields to the factory defaults. 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 59 INM Cluster Example Gap ( Ù INMCC) Gap (> INMCC) Gap (> INMCC) Gap (> INMCC) Cluster Gap Severely Degraded Data Symbol(s) Group 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 VES1724-56 User's Guide 121