ZyXEL Communications Corporation AMG1302 用户手册

Chapter 23 Diagnostic

AMG1302-T10A User’s Guide

DSL Line Status Click this to view statistics about the DSL connections.

 is the signal to noise ratio for the downstream part 

of the connection (coming into the Device from the ISP). It is measured in 

decibels. The higher the number the more signal and less noise there is. 

 is the amount of power (in decibels) that the Device is 

using to transmit to the ISP.

 is the reduction in amplitude (in decibels) of the DSL 

signal coming into the Device from the ISP.

Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth into sub-

carriers (sub-channels) 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. 

Reset ADSL Line Click this 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!"

Capture All Logs Click this to display information and statistics about your Device’s ATM statistics, 

DSL connection statistics, DHCP settings, firmware version, WAN and gateway IP 

address, VPI/VCI and LAN IP address.

Maintenance > Diagnostic > DSL Line (continued)