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How to Run the OPTP Command to Clear the IN_PWR_ABN Alarm That Is Reported by the OptiX OSN 3500

Publication Date:  2012-07-25 Views:  54 Downloads:  0
Issue Description
One day, a customer gives a feedback that the SL64 optical board on the OptiX OSN 3500 of a 10G ring network reports the IN_PWR_ABN alarm. The receive optical power of the SL64 optical board is between �16 dBm and �15 dBm. The customer requires that the alarm must be cleared. The NE version is 5.21.13.47P02. 
Alarm Information
IN_PWR_ABN 
Handling Process
The board is the SL64 (V64.2b) long haul optical board. Query data. The query result shows that the sensitivity of the SL64 optical board is �27 dBm. Actually, the sensitivity value is a valid value when the SL64 optical board is used with the BPA board. The actual receive optical sensitivity of the SL64 optical board is �15.2 dBm. Therefore, the sensitivity of the SL64 optical board is about �15 dBm. Otherwise, the IN_PWR_ABN alarm is not reported. The optical power on the existing network cannot be adjusted, and an inconvenience will be caused if the alarm is shielded. Therefore, it is expected to solve the problem by adjusting the sensitivity of the SL64 optical board.
The result of consulting R&D engineers shows that optical boards with different rates, on the OptiX OSN 3500, OptiX OSN 2500, and OptiX OSN 1500, report the IN_PWR_ABN alarm, indicating that the input optical power is abnormal. The value of the optical power that is obtained from the T2000, however, is in the normal range.
The pluggable optical modules of optical boards on the OptiX OSN product series (including WDM products) are manufactured by different manufacturers. Therefore, the alarm thresholds of the optical modules are different, which causes the problem. The IN_PWR_ABN alarm threshold is configured on an optical module. The equipment reads the alarm threshold information in the optical module to determine the value that the optical power reaches, and therefore, the alarm is reported.
With regard to the line board of the R003 version, run the :optp command to query and set the sensitivity of the optical board. Adjust the optical power within a certain range. Thus, the IN_PWR_ABN alarm is not reported when the optical board receives optical signals normally.
The command formats are as follows:
? Format of the command for querying the IN_PWR_ABN alarm threshold of the board:
:optp:bid(board No. with a hexadecimal number),0,9b,01,08,13,optical interface No.(start from 1),1(receive optical power)
Format of the command for setting the IN_PWR_ABN alarm threshold of the board:
:optp:bid(board No. with a hexadecimal number),0,9b,01,08,12,optical interface No.(start from 1),1,optical power threshold with a hexadecimal number
Command word: 0x0812 (Set the performance threshold of a laser.)
0x0813 (Query the performance threshold of a laser.)
The formats of the output parameters are as follows:
pbyPara[0]: optical interface No.
pbyPara[1]: threshold type
1: receive optical power
2: transmit optical power of a laser
3: bias current
4: temperature
5: cooling current
6: APD high voltage data (valid for only the APD)
pbyPara[2�3]: upper threshold (arranged from the most significant bit)
pbyPara[4�5]: lower threshold (arranged from the most significant bit)
Run query commands to return parameters:
:optp:8,0,9b,01,08,13,1,1 //Query the threshold of the receive optical power of the first optical interface in slot 8.
Optp cmd:0813 01 01 ff e2 ff 6a //High threshold: lHighTh = ff e2; low threshold: lLowTh = ff 6a
Convert "lLowTh = fe 6a" into a decimal number. The conversion method is as follows: Reverse "fe 6a", add the value by 1, convert the value into a decimal number, and add a minus in front of the value. For example: Reverse "fe6a", and the result is 0195; add 0195 by 1, and the result is 0196; convert 0196 into a decimal number, and add a minus before the value, the result is �150 (�15 dBm, unit: 0.1 dBm). Note: If the most significant bit is not 1, do not reverse "fe6a" or add 1 to the value; convert "fe6a" into a decimal number only. For example, the converted result of 0050 is 80.
If the sensitivity threshold of the optical board is set to �16 dBm, the "lLowTh = ff 60" can be obtained through reversing.
Run the :optp command to set the threshold:
:optp:8,0,9b,01,08,12,1,1,ff,e2,ff,6a
Run the :optp command to query the result:
:optp:8,0,9b,01,08,13,1,1 //Query the threshold of the receive optical power of the first optical interface in slot 8.
Optp cmd:0813 01 01 ff e2 ff 60 //High threshold: lHighTh = ff e2; low threshold: lLowTh = ff 60
The receive optical power of the SL64 optical board on the existing network equipment is �15.2 dBm. Run the :optp command to query the sensitivity of the SL64 optical board. The query result shows that the sensitivity of the SL64 optical board is �15 dBm. Run the :optp command to set the sensitivity of the SL64 optical board to �16 dBm. Then, the alarm is cleared, and the problem is solved. 
 
Root Cause
1. The attenuation of an external optical path is large.
2. The attenuation of a fiber jumper is large or the bending degree is over high.
3. The optical interface of the board is polluted.
4. The board is faulty. 
 
Suggestions
It is recommended that a new function be added to later versions of the T2000 to support the query and modification of the receive optical power parameters of the optical board on the OptiX OSN equipment. 

END