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Pon/port alarm

Pon/port alarm

Created: Dec 14, 2021 08:32:37Latest reply: Dec 15, 2021 08:30:32 368 11 1 0 0
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Hello there!


I have a PON/Port with this alarm:

0x2e11a001 The feeder fiber is broken or OLT can not receive any expected optical signals(LOS)

The problem is that the 1 of the 4 ONTs conected to the port is power on. In particular

Ont 1 =power off

ont2=power off

ont3=power on

ont4 =power off


According to the following procedure , the alarm is generated when all onts are off :

Description


When no signal is detected on the PON port, the system generates this alarm.


Possible Causes


  • The laser of the port is shut down.

  • The backbone optical fiber connected to the port is faulty.

  • All the ONTs connected to the port are powered off or faulty.

  • The port hardware is faulty.


So,  why does the pon/port generate the alarm when 1 of the 4 ONTs  works normally?

Any idea ?


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Chenxintao
Admin Created Dec 15, 2021 05:41:26

Hello, friend!


Combine all the information you have provided:


The PON port of the OLT can receive signals from the ONT, and the ONT can go online normally after being powered on, but the OLT still reports the LOS alarm.


The possible causes are as follows: The OLT is configured with a protection group. When an optical line fault occurs, the connected ONT automatically switches ports. As a result, the OLT can receive signals from the ONT and the ONT can go online normally.


You can manually switch the ONT port to clear the LOS alarm of the OLT.


Thanks!

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gzzz
gzzz Admin Created Dec 14, 2021 08:33:00

Hello, dear!

It's nice to meet you in the community.

We're working on your problem. Just a moment, please.

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Navin_kay
Navin_kay Created Dec 14, 2021 09:55:42 (0) (0)
oh  
(1) (0)
3#
Chenxintao
Chenxintao Admin Created Dec 14, 2021 08:48:20

Hello, friend!
Did you check in accordance with the previous question? Generally, LOS alarms are caused by faults in optical fibers and physical lines.
I don't know whether you have any operation that causes the device to generate alarms and the description of the previous problem. Four ONUs connected to the PON port can receive signals from two of the ONUs. I understand that your question is in this case, should the alarms be cleared?
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XRYSANTHI
XRYSANTHI Created Dec 14, 2021 08:57:29

Posted by Chenxintao at 2021-12-14 08:48 Hello, friend!Did you check in accordance with the previous question? Generally, LOS alarms are caus ...
The alarm has not been cleared. Should all ONUs be activated ,to clear the alarm?
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chantha
chantha Created Dec 14, 2021 09:56:36 (0) (0)
oh  
(0) (0)
5#
Chenxintao
Chenxintao Admin Created Dec 14, 2021 09:06:07

Posted by XRYSANTHI at 2021-12-14 08:57 The alarm has not been cleared. Should all ONUs be activated ,to clear the alarm?
Hello, friend!

In the problem description, does ONT 3 go online normally?
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6#
XRYSANTHI
XRYSANTHI Created Dec 14, 2021 09:09:15

Posted by Chenxintao at 2021-12-14 09:06Hello, friend!In the problem description, does ONT 3 go online normally?

yes ! 2  of 4 go online normally. ont 3 and ont1 as you can see in the previous image

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chantha
chantha Created Dec 14, 2021 09:56:52 (0) (0)
oh  
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7#
Chenxintao
Chenxintao Admin Created Dec 14, 2021 09:24:05

Posted by XRYSANTHI at 2021-12-14 09:09 Posted by Chenxintao at 2021-12-14 09:09Hello, friend!In the problem description, does ONT 3 go onli ...
Hello, friend!
Do you configure Type B networking protection? In this case, the ONT may be switched to another port.
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8#
Chenxintao
Chenxintao Admin Created Dec 15, 2021 05:41:26

Hello, friend!


Combine all the information you have provided:


The PON port of the OLT can receive signals from the ONT, and the ONT can go online normally after being powered on, but the OLT still reports the LOS alarm.


The possible causes are as follows: The OLT is configured with a protection group. When an optical line fault occurs, the connected ONT automatically switches ports. As a result, the OLT can receive signals from the ONT and the ONT can go online normally.


You can manually switch the ONT port to clear the LOS alarm of the OLT.


Thanks!

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  • convention：
(0) (0)
9#
XRYSANTHI
XRYSANTHI Created Dec 15, 2021 08:30:32

Posted by Chenxintao at 2021-12-15 05:41 Hello, friend!Combine all the information you have provided:The PON port of the OLT can receive sign ...
thank you so much !!
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