Chapter 52 ADSL Commands

 

Table 97 Line Diagnostics Get 992.3 Command (continued)

 

LABEL

DESCRIPTION

 

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).

 

 

 

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.

Figure 250 SELT Diagnostic Set Command Example

ras> adsl linediag setselt 1

 

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IES-612-51A User’s Guide