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Knowledge Base

N2510 - SELT Test Port deactivation method?

Publication Date:  2018-11-30  |   Views:  1204  |   Downloads:  0  |   Author:  a84084336  |   Document ID:  EKB1002020423


Issue Description

We read that a SELT Test can’t be done when the DSL port is activated. So the tool must deactivate the port to get informations needed.

 How does it work ? How the port is deactivated ? Is it a N2510 action or a U2000 action ?

The status is on « enable » state. There is some error when the port is not deactivated and the SELT test can’t be done.

The test failed when the port is activated.


Because the port is actually ADSL and not VDSL, indeed we need to set the status to Deactivated. This can be done in U2000:

1.     In the Main Topology, double-click the required NE in the Physical Root navigation tree; or right-click the required NE and choose NE Explorer from the shortcut menu.

2.     Choose DSL > ADSL Port from the navigation tree.

The ADSL can be navigated in the following ways:

Choose Configuration > Access Service Management > ADSL Port from the main menu (traditional style); alternatively, double-click Fix-Network NE Configuration in Application Center and choose Access Service > Access Service Management > ADSL Port from the main menu (application style).




Deactivates an ADSL port. Perform this operation when you need to disconnect the communication connection between an ATU-C and an ATU-R or modify the line profile bound to an activated port. After you deactivate an ADSL port, the communication connection that is set up between the ATU-C and the ATU-R when the port is activated is released.

·         You can bulk deactivate ADSL ports: Select multiple ADSL ports, right-click, and then choose Deactivate from the shortcut menu.

·         You can deactivate ports in the activated or activating state.


Deactivating an ADSL port makes the configuration of the port invalid and interrupts all services on the port. Therefore, exercise caution when you deactivate an ADSL port.

You can do the SELT test afterwards.


We have one additional info we want to share. The SELT test is decided by the device. Some dslam service boards do not support SELT test, because they may not have the SELT chip incorporated. You can chech if the SELT test is supported by logging into the device:

adsl selt portid [ [ loop-gauge loop-gauge ] | [ calculate { disable | enable } ] | [ qln { disable | enable selt-qln-mmd } ] | [ uer { disable | enable selt-uer-mmd } ] ]*






Indicates the ADSL port ID. It identifies the port to be performed with the SELT.

Numeral type. Range: varies with the board type.

loop-gauge loop-gauge

Indicates the loop gauge selected in the test.

Enumerated type. Options:

  • 26 awg: 0.4 mm
  • 24 awg: 0.5 mm


Indicates the function of calculating the basic data in the SELT.

Enumerated type. Range: disable, enable.

  • disable: Disables the function of calculating the basic data in the SELT.
  • enable: Enables the function of calculating the basic data in the SELT.


Indicates the quiet line noise (QLN) test function.

Enumerated type. Range: disable, enable.

  • disable: Disables the QLN test function.
  • enable: Enables the QLN test function.


Indicates the maximum duration of the QLN test.

Numeral type. Range: 1-240.

Unit: s.


Indicates the uncalibrated echo response (UER) test function.

Enumerated type. Range: disable, enable.

  • disable: Disables the UER test function.
  • enable: Enables the UER test function.


Indicates the maximum duration of the UER test.

Numeral type. Range: 5-240.

Unit: s.


Usage Guidelines

  • Run the config command to enter global config mode and run the interface adsl command to enter ADSL mode.
  • Before enabling a line or when maintaining a line, a SELT helps carriers to test some information about the line, including the line length, line reachable rate and line noise, to know the line future usability. The SELT is a type of non-standard test.
  • Before performing a SELT, ensure that the port is deactivated.
  • Do not connect modems to ports during SELT tests to ensure the test accuracy.
  • By default, the function of calculating the basic data in the SELT and the QLN test function are enabled; whereas the UER test function is disabled.
  • After the test is successful, the system reports the test results or you can also run the display adsl selt command to query the results.


To enable SELT on port 0/2/0, do as follows:

huawei(config-if-adsl-0/2)#adsl selt
{ portid<U><0,31> }:0 
{ <cr>|calculate<K>|loop-gauge<K>|qln<K>|uer<K> }:                                                         
          adsl selt 0                                                      
  Port 0/2/0 SELT start, it will take several minutes, please wait...           
  Port 0/2/0 SELT data is sampled completely, begin to calculate...             
  Port 0/2/0 SELT finish successfully 
  Frame/Slot/Port  : adsl 0/2/0  
  Updated time     : 2011-02-01  01:44:19                                   
  Line length      : 11.88 m (39 feet)                                     
  Line termination : open                                                  
  Line gauge       : 0.4 mm (26 awg)                                       
  SNR Margin(dB)   Upstream Rate(Kbps)   Downstream Rate(Kbps)             
              0                  1600                   28800              
              3                  1600                   28800               
              6                  1600                   28800              
              9                  1600                   28800              
             12                  1600                   28800