ZyXEL P-660HNU-F1 User Guide - Page 245
Table 85, DESCRIPTION, Diagnostic, ADSL Series User's Guide
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Chapter 25 Diagnostic Table 85 Maintenance > Diagnostic > DSL Line ITEM DESCRIPTION DSL Line Status Click this button to view statistics about the DSL connections. 1. noise margin downstream is the signal to noise ratio for the downstream part of the connection (coming into the ZyXEL Device from the ISP). It is measured in decibels. The higher the number the more signal and less noise there is. 2. output power upstream is the amount of power (in decibels) that the ZyXEL Device is using to transmit to the ISP. 3. attenuation downstream is the reduction in amplitude (in decibels) of the DSL signal coming into the ZyXEL Device from the ISP. Reset ADSL Line Discrete Multi-Tone (DMT) modulation divides up a line's bandwidth into sub-carriers (subchannels) of 4.3125 KHz each called tones. The rest of the display is the line's bit allocation. This is displayed as the number (in hexadecimal format) of bits transmitted for each tone. This can be used to determine the quality of the connection, whether a given sub-carrier loop has sufficient margins to support certain ADSL transmission rates, and possibly to determine whether particular specific types of interference or line attenuation exist. Refer to the ITU-T G.992.1 recommendation for more information on DMT. The better (or shorter) the line, the higher the number of bits transmitted for a DMT tone. The maximum number of bits that can be transmitted per DMT tone is 15. There will be some tones without any bits as there has to be space between the upstream and downstream channels. Click this button to reinitialize the ADSL line. The large text box above then displays the progress and results of this operation, for example: "Start to reset ADSL Loading ADSL modem F/W... Reset ADSL Line Successfully!" ADSL Series User's Guide 245