ZyXEL VES1724-56 User Guide - Page 65
VDSL sub-carrier status
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Chapter 7 System Status and Port Statistics Table 7 Status: VDSL Port Details (continued) LABEL Items Direction Display Show Measure MEDLEY PSD Break Point Tone Index PSD Level Poll Interval(s) Stop DESCRIPTION Select Hlog (Channel Transfer Function) to see the line's capability against interference and attenuation. Select QLN (Quiet Line Noise) to see the line's noise level. Select SNR (Signal-to-Noise-Ratio) to see the line's signal strength level. Select BitAlloc to display the number of bits allocated to each tone. The higher the bit allocated, the higher the data transmission rate. Select GainAlloc to display the gain allocated to each tone. Normally, each tone gets a different gain value allocated to avoid interference. Select Downstream or Upstream for the direction. Select Both for both downstream and upstream directions. Select Graph or Text to display the graph or statistic data of the VDSL sub-carrier status. This field is not configurable and the Switch only displays the status in a graph when you select Both in the Direction field. Select the criteria above and click Show to display a screen where displays you port detail information in raw data or in a graph. Click Measure to display the latest VDSL port details in this screen. This section displays the final PSD the Switch proposes to the connected CPE during line initialization. This field displays the index number for each incremental break point. This field displays the corresponding tone according to the specified break point. A tone is a sub-channel of a VDSL band. DMT divides VDSL bands into many 4.3125 kHz tones. This field displays the final PSD level the Switch proposes for the specified tone. The text box displays how often (in seconds) this screen refreshes. You may change the refresh interval by typing a new number in the text box and then clicking Set Interval. Click Stop to stop refreshing this screen. The following figures show you examples of each graph type that can be displayed when you click Show in the VDSL sub-carrier status section. Downstream information is in blue and upstream in red. VES1724-56 User's Guide 65