A lot of alarm “The OLT cannot receive expected optical signals from the ONT in four consecutive frames” was report Alarm was reported from different PON port and customer complaint there were service interruptions
issue description:
problem analysis:
Command:
display alarm history alarmparameter 0/1/4
Now system is searching the alarm, please wait......
ALARM 63186 RECOVERY CLEARED 0x2e122007 SERVICE QUALITY 2019-02-04 06:10+
08:00
ALARM NAME : OLT can receive expected optical signals from ONT(LOSi/LOBi
recovers)
SRVEFF : NSA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT can receive expected optical signals from the ONT in
four consecutive frames
CAUSE : The signal of the ONT recovers from the abnormal state
ADVICE : No need to deal with it
--- END
ALARM 63184 FAULT WARNING 0x2e112007 SERVICE QUALITY 2019-02-04 06:10+08:00
ALARM NAME : The distribute fiber is broken or the OLT cannot receive
expected optical signals from the ONT(LOSi/LOBi)
SRVEFF : SA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT cannot receive expected optical signals from the ONT
in four consecutive frames
CAUSE : (1) The fiber is broken
(2) The quality of the optical path is poor
(3) The ONT hardware fails
ADVICE : (1) Check tributary optical fiber connection and backbone
optical fiber orderly, clean the fiber connector and replace
the fiber if necessary
(2) Ensure that the optical attenuation of the optical path is normal
(3) Reset the ONT or replace the ONT
--- END
ALARM 63073 RECOVERY CLEARED 0x2e122007 SERVICE QUALITY 2019-02-04 06:10+
08:00
ALARM NAME : OLT can receive expected optical signals from ONT(LOSi/LOBi
recovers)
SRVEFF : NSA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT can receive expected optical signals from the ONT in
four consecutive frames
CAUSE : The signal of the ONT recovers from the abnormal state
ADVICE : No need to deal with it
--- END
ALARM 63070 FAULT WARNING 0x2e112007 SERVICE QUALITY 2019-02-04 06:10+08:00
ALARM NAME : The distribute fiber is broken or the OLT cannot receive
expected optical signals from the ONT(LOSi/LOBi)
SRVEFF : SA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT cannot receive expected optical signals from the ONT
in four consecutive frames
CAUSE : (1) The fiber is broken
(2) The quality of the optical path is poor
(3) The ONT hardware fails
ADVICE : (1) Check tributary optical fiber connection and backbone
optical fiber orderly, clean the fiber connector and replace
the fiber if necessary
(2) Ensure that the optical attenuation of the optical path is normal
(3) Reset the ONT or replace the ONT
--- END
ALARM 62959 RECOVERY CLEARED 0x2e122007 SERVICE QUALITY 2019-02-04 06:10+
08:00
ALARM NAME : OLT can receive expected optical signals from ONT(LOSi/LOBi
recovers)
SRVEFF : NSA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT can receive expected optical signals from the ONT in
four consecutive frames
CAUSE : The signal of the ONT recovers from the abnormal state
ADVICE : No need to deal with it
--- END
ALARM 62958 FAULT WARNING 0x2e112007 SERVICE QUALITY 2019-02-04 06:10+08:00
ALARM NAME : The distribute fiber is broken or the OLT cannot receive
expected optical signals from the ONT(LOSi/LOBi)
SRVEFF : SA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT cannot receive expected optical signals from the ONT
in four consecutive frames
CAUSE : (1) The fiber is broken
(2) The quality of the optical path is poor
(3) The ONT hardware fails
ADVICE : (1) Check tributary optical fiber connection and backbone
optical fiber orderly, clean the fiber connector and replace
the fiber if necessary
(2) Ensure that the optical attenuation of the optical path is normal
(3) Reset the ONT or replace the ONT
--- END
ALARM 62846 RECOVERY CLEARED 0x2e122007 SERVICE QUALITY 2019-02-04 06:10+
08:00
ALARM NAME : OLT can receive expected optical signals from ONT(LOSi/LOBi
recovers)
SRVEFF : NSA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT can receive expected optical signals from the ONT in
four consecutive frames
CAUSE : The signal of the ONT recovers from the abnormal state
ADVICE : No need to deal with it
--- END
ALARM 62842 FAULT WARNING 0x2e112007 SERVICE QUALITY 2019-02-04 06:10+08:00
ALARM NAME : The distribute fiber is broken or the OLT cannot receive
expected optical signals from the ONT(LOSi/LOBi)
SRVEFF : SA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT cannot receive expected optical signals from the ONT
in four consecutive frames
CAUSE : (1) The fiber is broken
(2) The quality of the optical path is poor
(3) The ONT hardware fails
ADVICE : (1) Check tributary optical fiber connection and backbone
optical fiber orderly, clean the fiber connector and replace
the fiber if necessary
(2) Ensure that the optical attenuation of the optical path is normal
(3) Reset the ONT or replace the ONT
--- END
ALARM 62742 RECOVERY CLEARED 0x2e122007 SERVICE QUALITY 2019-02-04 06:10+
08:00
ALARM NAME : OLT can receive expected optical signals from ONT(LOSi/LOBi
recovers)
SRVEFF : NSA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT can receive expected optical signals from the ONT in
four consecutive frames
CAUSE : The signal of the ONT recovers from the abnormal state
ADVICE : No need to deal with it
--- END
ALARM 62740 FAULT WARNING 0x2e112007 SERVICE QUALITY 2019-02-04 06:10+08:00
ALARM NAME : The distribute fiber is broken or the OLT cannot receive
expected optical signals from the ONT(LOSi/LOBi)
SRVEFF : SA
PARAMETERS : FrameID: 0, SlotID: 1, PortID: 4, ONT ID: 0, Equipment ID:
245
DESCRIPTION : The OLT cannot receive expected optical signals from the ONT
in four consecutive frames
CAUSE : (1) The fiber is broken
(2) The quality of the optical path is poor
(3) The ONT hardware fails
ADVICE : (1) Check tributary optical fiber connection and backbone
optical fiber orderly, clean the fiber connector and replace
the fiber if necessary
(2) Ensure that the optical attenuation of the optical path is normal
(3) Reset the ONT or replace the ONT
--- END
when we check the alarms for the ONTs, the alarms was frequently , always generate the alarms and after 30-40 second will be recovery it , and check from ONT side ,we found the ONT was reboot frequently. refer to one precaution.
https://support.huawei.com/carrier/docview!docview?nid=SC2000008476&path=PBI1-7275726/PBI1-7275742/PBI1-22892592/PBI1-22318696/PBI1-4977710
root cause :
The problem cause by the Wi-Fi end device send out a lot of mDNS packet (some apps in Apple/Android) in a short time. After the ont receive large amount of mDNS packet, the CPU usage of ONT will running out and reboot itself, that makes the LOSI problem
solution :
This problem affected two kinds of Huawei ONT
HG8245 with version V100R003C00/C01
HG8247 with version V100R006C00/C01
To solve the problem need to upgrade the ONT to below version
HG8245 V100R006C00SPC220
HG8247 V100R006C00SPC220
