Some OLT GPON CLASS B+ optical modules provided by SOURCE PHOTONICS
may rarely become faulty after long-term working at high temperature, resulting in unstable transmit optical power, and ONUs being
offline.
Product Line: Access network Product Family: OLT
[Problem Description]
Trigger conditions:
2.Optical modules are OLT GPON CLASS B+ optical modules of the SPS4348HHPCDE model
provided by SOURCE PHOTONICS.
optical power, resulting in offline ONUs.
Symptoms:
Optical modules have unstable transmit optical power, resulting in offline ONUs.
Identification methods:
Method 1
If the ONU that connects to the PON port on a GPBD board is offline, perform the following
steps to check whether the cause is the involved optical module in the warning.
Step 1 Check whether the optical module is working at high temperature and belongs to the
SPS4348HHPCDE model.
Steo 2 Run the command to check whether the optical module has been working at high temperature
for a long term.
Temperature(C) 60 ----Enclosure temperature of the involved optical module in the warning exceeds 60 degrees.
the optical module is the SPS4348HHPCDE model.
Query using the command
Related optical module information in the query result is as follows:
Vendor PN SPS4348HHPCDE ----involved vendor PN
Query the label on the top side of the optical module.
The involved information is in red blocks on the label on the top side of the optical module, as shown
Step 4 Check whether the optical module is the involved optical module in the warning based on the
transmit optical power. If the transmit optical power not in the range from 1.5 dBm to 5 dBm after
multiple queries (using commands), the optical module is the involved optical module in the warning.
TX power(dBm) -10.61 ----The transmit optical power of the involved optical module is generally less than 1.5 dBm and a negative
number.
Query command:
:display port state [ponid]
MA5600T(config)#interface gpon 0/2
MA5600T(config-if-gpon-0/2)#display port state 1
---------------------------------------------------------------------------
F/S/P 0/2/1
Optical Module status Online
Port state Offline
Last down cause -
Last up time -
Last down time -
Laser state Normal
Available bandwidth(Kbps) 1239168
Temperature(C) 60 ----current enclosure temperature
TX Bias current(mA) 12
Supply Voltage(V) 3.07
TX power(dBm) -10.61 ----current transmit optical power
Illegal rogue ONT Inexistent
Max rate(Kbps) 2500000
Max Distance(Km) 20
Wave Length(nm) 1490
Fiber type Single Mode
Signal detect Failed
TX fault Normal
Identifier SFP
Ext.Identifier GBIC/SFP function is defined by serial ID only
Connector SC
Encoding NRZ
Length(9um)(Km) 20.0
Length(50um) -
Length(62.5um) -
Length(Copper) -
Cc_base 0xa2
CC_EXT 0xb2
BR,max Unspecified
BR,min Unspecified
SFF-8472 Compliance Includes functionality described in Rev 9.4
Diagnostic Monitoring Type Digital diagnostic monitoring
Externally Calibrated
Power measurement type: Average Power
Options TX_DISABLE,and disables the serial output
TX_FAULT
LOS(signal inverted from standard definition)
Enhanced Options Alarm/warning flags
TX_DISABLE control and monitoring
TX_FAULT monitoring
Vendor Rev Unspecified
Vendor PN SPS4348HHPCDE ----vendor PN
Vendor SN B4W2001959
Manufactured 10-04-29
Vendor name SOURCEPHOTONICS ----vendor name
Vendor OUI 0006b5
Vendor specific 53 50 53 2d 34 33 2d 34 38 48 2d 48 50 2d 43 44
45 20 20 20 20 20 20 20 20 20 00 00 00 00 00 00
Module type -
Module sub-type -
Used type -
Encapsulation Type -
----------------------------------------------------------------------------
----End
Method 2
vendor PN, transmit optical power, and enclosure temperature in the query results, as shown
Characteristics of the involved optical module: The temperature is higher than 60 degrees, the
transmit optical power is not in the range from 1.5 dBm to 5 dBm, the vendor PN is
SPS4348HHPCDE, and the vendor is SOURCE PHOTONICS.
[Root Cause]
Some optical modules may rarely become faulty after long-term working at high temperature, resulting in unstable transmit optical power.
[Impact and Risk]
When the problem occurs, corresponding ONUs are offline. According to the vendor, 0.143% of
the optical modules may become faulty at high temperature.
[Measures and Solutions]
Recovery measures:
Perform the following steps to cool the enclosure of the involved optical module.
Tune down the temperature in the equipment room.
Manually accelerate the rotating speed of fans. (Long-term high-speed rotation shortens the useful life of a fan, so this solution is just a temporary solution.) Setting
examples are as follows:
For V800R005/V800R006/V800R007/V800R008:
MA5600T(config)#interface emu 0
MA5600T(config-if-fan-0)#fan speed mode manual
MA5600T(config-if-fan-0)#fan speed adjust 5
For V800R009/V800R010/V800R011/V800R012:
MA5600T(config)#diagnose
MA5600T(diagnose)%%fan speed mode manual 6
The digit in red in the command indicates the rotating speed level of the fan (the highest levels
for V800R008 and V800R011 are 5 and 6 respectively), the higher the digit, the faster the rotating
speed. It is recommended to tune up the rotating speed to the maximum, and then gradually tune
it down. Long-term high-speed rotation shortens the useful life of a fan. Therefore, exercise caution when adopting this solution.
Preventive measures:
Use the preventive maintenance inspection tool to check the enclosure temperature of optical modules
on the live network. For the site where the enclosure temperature of optical modules is higher than 60
degrees, urge customers to improve equipment room environment. The recommended temperature is
about 23 (±1) degrees.
Solution:
When the problem occurs, perform the recovery measures to cool involved optical modules, and then
perform the following steps based on actual situations:
If the problem is solved, the optical module can be used but not used at high temperature.
If the problem persists (the hardware of the optical module is faulty), use a spare part to replace it. A
small number of faulty optical modules can be directly sent to Huawei for repair based on the specified
procedure. A large number of faulty optical modules are handled by corresponding regional service
contact personnel.
The warning does not take effect when the trigger conditions are not met.
[Attachment]
None
No comments:
Post a Comment