Diagnostic Commands; Diagnostic Ldm Show Command - ZyXEL Communications MSC1000G User Manual

MSC1000G User's Guide

21.2 diagnostic Commands

Use these commands to execute a specified diagnostic or test function to an interface port or a
subscriber port.

21.2.1 diagnostic ldm show Command

Syntax:
diagnostic ldm show <slot-port> result|hlin|hlog|qln|snr
where
result
hlin
hlog
qln
snr
Use this command to display the most recent line diagnostic mode test results for an ADSL
port. Use the line diagnostics results to analyze problems with the physical ADSL line.
Note: Wait at least one minute after using the
before using the
The following example performs line diagnostics on DSL port 4 of the line card in slot 5.
330
= Displays the basic line diagnostic mode test results.
= Displays the channel characteristics function represented in linear
format by a scale factor and a complex number. These are the
maximum upstream and downstream scale factors used in producing
the channel characteristics function.
= Displays channel characteristics. The format provides magnitude
values in a logarithmic scale. This can be used in analyzing the
physical condition of the ADSL line.
= Displays the Quiet Line Noise for a DMT tone is the rms (root mean
square) level of the noise present on the line, when no ADSL signals
are present. It is measured in dBm/Hz. The QLN can be used in
analyzing crosstalk.
= Displays the upstream and downstream Signal to Noise Ratio (in dB).
A DMT tone's SNR is the ratio between the received signal power and
the received noise power. The SNR can be used in analyzing time
dependent changes in crosstalk levels and line attenuation (such as
those caused by temperature variations and moisture).
diagnostic ldm show
diagnostic ldm test
command.
Chapter 21 diagnostic Commands
command