Abstract: 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 Model: MA5600T, MA5603T, MA5680T, and MA5683T
[Problem Description]
Trigger conditions:
Optical modules have been working at the temperature higher than 60 degrees for a long term.
Optical modules are OLT GPON CLASS B+ optical modules of the SPS4348HHPCDE model provided by SOURCE PHOTONICS.
When the above conditions are met, 0.143% of the optical modules may have unstable transmit 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.
Check whether the optical module is working at high temperature and belongs to the SPS4348HHPCDE model.
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.
Run the command or query the label on the top side of the optical module to check whether 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 in Figure 1.
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
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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 -
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