Status/SELT Help

With the Single-End Loop Test (SELT) a copper loop can be tested without the need for any external test equipment in either the CO or at the remote end of the loop. SELT is primarily used for proactive loop pre-qualification. By checking in advance if a loop is capable of supporting ADSL2+ and by determining distance, wire gauge and noise - loop conditions can be fixed prior to rolling a truck to the customer premise.

Note that 0nly one test (SELT, DELT, or TAC) can run at a time on an interface. Otherwise the current test will be interrupted by the newly configured test, thus the test results returned will be inaccurate. Only one SELT test can run at a time on a card. However, multiple DELT tests can run at same time on a board, as long as they are not running in the same interface.

To update the displayed data, click the Refresh button.

To enable the SELT buttons, check the box next to a port.

To change the state of the line to Up, click the Admin Up button.

To begin SELT testing, select an interface, then click the Admin Down button to bring the state of the line to down.

To go to the screen where SELT testing can begin, select an interface, then click the Start Test button.

To view the status of the SELT testing, click the Poll Test Status button. (The Admin state must be down.)

To view the loop test results, click the Loop Test Result button.

To view the noise floor results, click the Noise Floor Result button.

SELT Status

Port

A unique value for each interface.

Oper Status

Indicates the operational status of the interface.

Admin Status

The administrative status of the interface.

Up: The interface is enabled and up, and the status of the interface should become standby or operational.

Down: The interface is disabled and down, and the status of the interface would become shutdown.

SELT Status

This object provides status about any SELT test running or ever run (since last reset) on an ADSL interface. This object can be read by NMS managers to determine the status of a test.

Status:

inProgress - the test is currently running.

stoppedInProgress - a request to stop the test is still in progress.

complete - the test has been run at least once since system reset and has completed.

notStarted - the test has not been run on this interface since last system reset.

resultsCleared - the entries in the test results table, Lc and Lnf, were cleared.

aborted - the test was aborted by the user before it could complete. In this case, the Lc and Lnf tables will have been removed.

timedOut - the test was aborted automatically because it did not complete before the timeout specified by SELT Duration. In this case, the Lc and Lnf tables will have been removed.

unsupported - the device does not support SELT.

portActive - port must be OUT-OF-SERVICE to run SELT.

measurementsInvalid - SELT returns invalid measurements.

Gauge Expected

This object configures the expected wire gauge of the loop. The values supported depend on which chip is being used to perform the selt measurement. For example, the Conexant G24 must be configured as either awg24 or awg26 (or the metric equivalents .50mm or .40mm respectively).

The values are:

unknown

AWG

awg26

awg24

awg22

awg19

Metric

metric32 - (0.32mm)

metric40 - (0.40mm)

metric50 - (0.50mm)

metric63 - (0.63mm)

metric90 - (0.90mm)

Metric/Japan

metricJapan32 - (0.32mm)

metricJapan40 - (0.40mm)

metricJapan50 - (0.50mm)

metricJapan65 - (0.65mm)

metricJapan90 - (0.90mm)

Default:

awg26

SELT Duration (sec)

The maximum time in seconds that the SELT test measurement can take. If the test runs longer than this, it will be aborted, and the results (if any) will be removed.

Default:

600

Time Left (sec)

This object provides the approximate time left in seconds for the test running on this interface. This object will return 0 if no test is actively running on the interface specified.

Time Completed

This object provides a date and time stamp corresponding to the last completion of a test where valid results were obtained. If no test results are available, perhaps in the situation where no test has ever been started, this object shall return a value that has all the fields set to zero.

SELT Device

Chip set used to perform the SELT test.

Bridge Taps Supported

Provides a way to query whether or not the measurement device supports SELT on loops that have bridge taps. If this object returns false, and SELT is run on a loop with bridge taps, the SELT results will be unreliable.

SELT Cable

Configured expected cable

Values:.

real - indicates actual physical cable

simulatedWithdsl90

simuslatedWithds400

Default value is real.

 

March 24, 2012