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Knowledge Base

AR129 did not work on a new ADSL line

Publication Date:  2019-07-22  |   Views:  766  |   Downloads:  0  |   Author:  a84079237  |   Document ID:  EKB1000830008

Contents

Issue Description

- We found that the AR129 did not work on a new ADSL line and we tried with different routers, including another AR129 that also did not work and a Cisco C867VAE-K9 that worked with no issues.

- AR120 V200R007C00SPCb00, has issue with the Training Status stays stuck in “Handshake”

I’ve turned on debug ATM but receive no messages back.

- I did also connect the AR129 to a VDSL2 service and changed mode from atm to ptm and the line synced without an issue.

 

Alarm Information

<Huawei>display dsl int atm0/0/0

--------------------------------------------------------------

DSL driver and PHY status

      Training status                      : Handshake

 

Line modulations

      G.Dmt                                : Enabled

      T1.413                               : Enabled

      ADSL2                                : Enabled

      ADSL2+                               : Enabled

      AnnexA                               : Enabled

      AnnexB                               : Enabled

      AnnexJ                               : Enabled

      AnnexL                               : Enabled

      AnnexM                               : Enabled

 

Line capability

      Bitswap                              : On

      SRA                                  : Off

      Trellis coding                       : On

 

Board version

      vendor ID                            : TRID

      vendor serial                        : 1.02.25

      Board ID                             : VSPM340

      Software version                     : 3.4

      Bootloader (CFE) version             : G3_01_36_12

      DSL PHY and driver version           : 1.02.25

--------------------------------------------------------------

Handling Process

- First we have notice that customer is not using any patch so we recommend to him to upgrade to the latest patch version. After the upgrade the problem was persisting.

SP has been installed as requested

<Huawei>display patch-information

Patch version         :ARV200R007SPH013

Patch package name    :flash:/AR120-V200R007SPH013.pat

The state of the patch state file is:Running

The current state is:Running

******************************************************************

*              The patch information,as follows                  *

******************************************************************

Type        State         Count          Time(YYYY-MM-DD HH:MM:SS)

------------------------------------------------------------------

vrp         Running       97             2000-04-05 17:30:43+00:00

cap         Running       28             2000-04-05 17:30:44+00:00

 

But I’m afraid the issues still remains


<Huawei>display dsl int atm0/0/0

--------------------------------------------------------------

DSL driver and PHY status

      Training status                      : Handshake

 

Line modulations

      G.Dmt                                : Enabled

      T1.413                               : Enabled

      ADSL2                                : Enabled

      ADSL2+                               : Enabled

      AnnexA                               : Enabled

      AnnexB                               : Enabled

      AnnexJ                               : Enabled

      AnnexL                               : Enabled

      AnnexM                               : Enabled

 

Line capability

      Bitswap                              : On

      SRA                                  : Off

      Trellis coding                       : On

Board version

      vendor ID                            : TRID

      vendor serial                        : 1.02.25

      Board ID                             : VSPM340

      Software version                     : 3.4

      Bootloader (CFE) version             : G3_01_36_12

      DSL PHY and driver version           : 1.02.25

--------------------------------------------------------------


- Next step, we release a test patch that will allow to collect diagnostic logs from DSL driver so we can analyze the logs. We recommend to install this patch only on equipment used in test environment. Next was to give access to customer to download the patch that R&D indicate. 

- After customer download the patch nex steps as follows:

This is a cold patch, so you will need to follow the procedure below:

1. Upload the patch to the device flash

2. Remove the old patch

3. Execute the command startup patch AR120-V200R007C00CP0910T.pat.

4. Reboot the device

After you install the patch and reboot the device, please follow the steps below to collect the logs required to confirm the root cause of this issue.


1. Connect to the device using a console cable

2. Enter diagnose mode and enable DSL diagnostic 

<Huawei> system-view

[Huawei] diagnose

[Huawei-diagnose] driver diagnose dsl enable

[Huawei-diagnose] driver diagnose dsl dfe-uart-enable 300

3. Disconnect the console cable, change the console baud rate to 115200bps and connect to the device again. The logs will now be printed on-screen, so please log the output.

4. Pull out the DSL cable from device and plug it back in to collect the full negotiation log.

After about 300 seconds you will be able to connect to device with normal console baud rate.

Please send us the log output for analysis.



Root Cause

We analyzed the log file and found the below points:

1. The AR129 ATM interface is in auto mode, which means it will send annexa and annexb signals to the DSLAM.

2. The DSLAM device may only support annexa, so when there are two types of signals,  the DSLAM can’t differentiate them.

We suggest to configure the command below in the ATM interface and test again.

#                                                                                                                                   

interface Atm0/0/0                                                                                                                  

 adsl standard adsl2+ annexa                                                                                                        

#               


Solution

Customer added the command and now it trained.

 

DSL driver and PHY status

      Training status                      : Showtime

      Transmission mode                    : ADSL2+ AnnexA

      Line status                          : No Defect

      Downstream max. attainable rate(Kbps): 7184

      Upstream max. attainable rate(Kbps)  : 935

      Downstream actual net data rate(Kbps): 2268

      Upstream actual net data rate(Kbps)  : 448

      Downstream SNR margin(dB)            : 19.5

      Upstream SNR margin(dB)              : 12.0

      Downstream attenuation(dB)           : 45.3

      Upstream attenuation(dB)             : 28.5

      Downstream output power(dBm)         : 15.8

      Upstream output power(dBm)           : 12.5

      Downstream total cells               : 3551

      Upstream total cells                 : 5362

      Downstream data cells                : 0

      Upstream data cells                  : 2

      Downstream bit errors                : 0

      Upstream bit errors                  : 0

      Total drop cells                     : 0

      Downstream total ES count            : 1

      Upstream total ES count              : 0

      Downstream total SES count           : 0

      Upstream total SES count             : 0

      Downstream total UAS count           : 71159

      Upstream total UAS count             : 71159

      Total AS count                       : 0

 

Line modulations

      G.Dmt                                : Disabled

      T1.413                               : Disabled

      ADSL2                                : Disabled

      ADSL2+                               : Enabled

      AnnexA                               : Enabled

      AnnexB                               : Disabled

      AnnexJ                               : Disabled

      AnnexL                               : Disabled

      AnnexM                               : Disabled 

Line capability

      Bitswap                              : On

      SRA                                  : Off

      Trellis coding                       : On

 

Board version

      vendor ID                            : TRID

      vendor serial                        : 1.02.25

      Board ID                             : VSPM340

      Software version                     : 3.4

      Bootloader (CFE) version             : G3_01_36_12sc00

      DSL PHY and driver version           : 1.02.25

ATU-C version

      vendor ID                            : TSTC:0x3035

      vendor number                        : 0x3035


Thanks for the help on this.