An OSN 1800 NE is Unreachable by the NMS due to the incorrect subrack ID Highlighted

Latest reply: Mar 9, 2020 17:31:18 891 28 8 0

Dear all,


I would like to share with you this topic which describes how to troubleshoot the fault that occur when an OSN 1800 NE is unreachable by the NMS.


Fault Symptom & Cause Analysis

An OSN 1800 NE at a site is unreachable. After the SCC board of the subrack is replaced, the problem persists. After the replaced SCC board is inserted into a new OSN 1800 subrack, the new subrack is reachable.

The OSN 1800 NE in question has been configured as a slave subrack (the master/slave subrack configuration is supported only in V100R002 and later versions). This can be observed by checking its ID settings. The subrack is unreachable when an attempt is made to reconfigure it as a master subrack or to log in to it directly through a PC. 


Fault Isolation Procedure 

Step 1 

Confirm that the OSN 1800 subrack in question has been configured as a slave subrack. Based on this information, Huawei determines that the ID of the subrack has caused this problem. 

Step 2 

Set the DIP switches on the SCC board to 1001 in binary to restore the default subrack mode (independent subrack mode). Specifically, toggle the 1st and 4th switches to ON and the 2nd and 3rd switches to OFF, as shown in the following figure. After that, insert the SCC board back to the OSN 1800 subrack in question.

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Step 3 

Observe the STAT indicator on the SCC board. When the fan rotation speed slows down, the STAT indicator on the SCC board blinks slowly, indicating that the SCC board has booted and the subrack is restored to work in independent mode. Remove the SCC board and toggle all the DIP switches to OFF (that is, set the DIP switches to 0000 in binary) and then insert it back to the subrack. Allow some time for the SCC board to reboot.

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After the SCC board reboots, the problem is resolved. The OSN 1800 subrack in question can be logged in to.

----End


Related Concept 

1. The OSN 1800 subrack can work in either independent subrack mode or master/slave subrack mode. You can determine which subrack mode is in use by checking the subrack ID on the U2000. In independent subrack mode, the subrack ID is 255. It cannot have any slave subrack or function as a slave subrack. In master/slave subrack mode, the subrack ID is within the range of 0–6. Currently, an OSN 1800 master subrack supports at most six slave subracks. The subrack ID 0 means the master subrack and subrack IDs 1–6 means slave subracks. 

2. For NG WDM equipment, subrack IDs are set using the DIP switches. However, for OSN 1800 equipment, the subrack IDs have to be set using the U2000. The following figure shows the U2000 GUI in which the OSN 1800 subrack IDs are set.

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3. The default ID of an OSN 1800 subrack is 255. That is, the subrack is in independent mode by default.

4. After a subrack is configured as a slave subrack (by setting the subrack ID to a value within the range of 1–6), the SCC board on this subrack can communicate with only the master subrack. If the subrack is not connected to the master subrack, then the subrack will be unreachable. 


Conclusion and Suggestion 

When such a problem occurs, there is no need to replace the SCC board in the subrack. Instead, set the DIP switches to binary value 1001 to restore the default subrack ID, as described in the Fault Isolation Procedure. Note that this method applies only to the OSN 1800 1 U and 2 U subracks of the global version


ReferenceOSN 1800 Product Documentation 


Thanks!

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Wassim
Created Feb 18, 2020 17:50:04 Helpful(1) Helpful(1)

Thank you for sharing
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wissal
wissal Created 4 days ago
You are welcome!  
be_lo
Created Feb 19, 2020 18:58:47 Helpful(1) Helpful(1)

Useful sharing, thanks
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wissal
wissal Created 4 days ago
You are welcome!  
raf_han
Created Feb 20, 2020 08:21:17 Helpful(1) Helpful(1)

A practical case, useful for my work, thank you
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wissal
wissal Created 4 days ago
You are welcome!  
Loti_fa
Created Feb 21, 2020 15:08:33 Helpful(1) Helpful(1)

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wissal
wissal Created 4 days ago
Thanks  
Jul_ang
Created Feb 22, 2020 16:24:18 Helpful(1) Helpful(1)

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wissal
wissal Created 4 days ago
Thanks  
shakeela
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wissal
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azkasaqib
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wissal
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azkasaqib
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gabo.lr
MVE Created Feb 24, 2020 13:59:27 Helpful(1) Helpful(1)

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wissal
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You are welcome!  
Telecommunications%20and%20Electronics%20Engineer%2C%20with%208%20years%20of%20experience%20working%20with%20Huawei%20equipment.
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