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Chapter 52 ADSL Commands
IES-612-51A User’s Guide
367
52.2.10 SELT Diagnostic Set Command
Syntax:
ras> adsl linediag setselt <port number>
This command has the IES-612-51A perform a single end line test on the specified port. This
test checks the distance to the subscriber’s location.
" The port must have an open loop. There cannot be a DSL device, phone, fax
machine or other device connected to the subscriber’s end of the telephone
line.
The test takes at least 15 seconds. You can run the SELT Diagnostic Get Command to check
the status of the test and to look at the results.
The following example starts a SELT test on DSL port 1.
snrm: This is the upstream and downstream Signal-to-Noise Ratio Margin (in dB). A
DMT sub-carrier’s SNR is the ratio between the received signal power and the
received noise power. The signal-to-noise ratio margin is the maximum that the
received noise power could increase with the IES-612-51A still being able to
meet its transmission targets.
attndr: This is the upstream and downstream Attainable Net Data Rate (in bit/s).
farEndActatp: This is the upstream and downstream Far End Actual Aggregate Transmit
Power (in dBm)
i This is the index number of the DMT sub-carrier.
li.rl The channel characteristics function is represented in linear format by a scale
factor and a complex number. This is the real part of the complex number used
in producing the channel characteristics function for this sub-carrier.
li.im The channel characteristics function is represented in linear format by a scale
factor and a complex number. This is the imaginary part of the complex number
used in producing the channel characteristics function for this sub-carrier
log This is a format for providing channel characteristics. It provides magnitude
values in a logarithmic scale. It is measured in dB. This can be used in
analyzing the physical condition of the DSL line.
QLN The Quiet Line Noise for a DMT sub-carrier is the rms (root mean square) level
of the noise present on the line, when no DSL signals are present. It is
measured in dBm. The QLN can be used in analyzing crosstalk.
SNR This is the upstream and downstream Signal-to-Noise Ratio (in dB). A DMT
sub-carrier’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).
Table 97 Line Diagnostics Get 992.3 Command (continued)
LABEL DESCRIPTION
Figure 250 SELT Diagnostic Set Command Example
ras> adsl linediag setselt 1