ZyXEL Communications AMG1302-T10A User Manual page 226

Chapter 23 Diagnostic
Table 99 Maintenance > Diagnostic > DSL Line (continued)
LABEL
DSL Line Status
Reset ADSL Line Click this to reinitialize the ADSL line. The large text box above then displays the
Capture All Logs Click this to display information and statistics about your Device's ATM statistics,
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DESCRIPTION
Click this to view statistics about the DSL connections.
noise margin downstream 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.
output power upstream is the amount of power (in decibels) that the Device is
using to transmit to the ISP.
attenuation downstream 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.
progress and results of this operation, for example:
"Start to reset ADSL
Loading ADSL modem F/W...
Reset ADSL Line Successfully!"
DSL connection statistics, DHCP settings, firmware version, WAN and gateway IP
address, VPI/VCI and LAN IP address.
AMG1302-T10A User's Guide