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FAQ-How to Adjust the Wavelength Offset of the OTU Manually

Publication Date:  2012-07-25 Views:  59 Downloads:  0
Issue Description
Q:
In the WDM system, frequency offset may occur on the laser of the OTU in the lifecycle. When the OTU of a 100 GHz module is used in the 50 GHz channel spacing system, the frequency offset is large, and the system performance is affected. When the WMU is not configured or the WMU is faulty, a command needs to be entered manually to adjust the wavelength of a respective OTU.
Alarm Information
Null.
Handling Process

A:

1.       Run the following command to scan the offset of the OTU in the subrack through the MCA.

:cfg-get-analydata :Bid,Port;

In the command, Bid indicates the number of the slot where the MCA resides, and Port indicates the optical port number of the MCA. The values of the two parameters can be 1, 2, 3, or 4.

For example, run the following command to query the 76th wave. The query result shows that offset exists in the 76th wave. The value of OFFSET is �10.

:cfg-get-analydata:13,4                                                                    
                                              ANALY-DATA                                  
BID   PORT  BAND-TYPE    ACTUAL-WAVE  WAVE-NUM  CEN-WAVELEN  OFFSET      POWER       SNR  
13    4      cband          1            76       155888       -10         -359        301

2. Run the following command to query the current AD value of the tube core temperature of the corresponding OTU.

:optp:bid,1,83,1,ff,3d,1,1,0;

In the command, bid indicates the number of the slot where the offset OTU resides. For example, the following shows the output for querying the current AD value of the tube core temperature of the OTU for the 76th wave. In the output, 00 00 06 09 is the AD value.

#9-1537:szhw [][][2009-05-07 16:14:36+08:00]>
:optp:10,1,83,1,ff,3d,1,1,0
Optp cmd : ff3d                                                                  
01 01 00 00 00 06 09                                                             
  Total records :1

3. Based on the offset, run the following command to set the AD value of the tube core temperature of the corresponding OTU to adjust the wavelength.

:optp:bid,1,83,1,ff,3c,1,1,0,00,00,06,20;

In the command, bid indicates the number of the slot where the offset OTU resides. The last four bytes (00,00,06,20) are the AD value. The two parts in the command should be changed according to the actual situation.

For example, run the command in the first step to set the AD value of the tube core temperature of the OTU for the 76th wave. After the setting, run the command in the second step to query the specified value.

#9-1537:szhw [][][2009-05-07 16:19:51+08:00]>
:optp:10,1,83,1,ff,3c,1,1,0,00,00,06,20
#9-1537:szhw [][][2009-05-07 16:19:52+08:00]>
:optp:10,1,83,1,ff,3d,1,1,0
Optp cmd : ff3d                                                                  
01 01 00 00 00 06 20                                                             
  Total records :1

4. Run the command in the first step again to query the current offset value through the MCA. You can see that the current offset value is �8, which is smaller than the offset value queried in the first step. Repeat the preceding operations until the offset value is in the normal range.

:cfg-get-analydata:13,4                                                                    
                                              ANALY-DATA                                  
BID   PORT  BAND-TYPE    ACTUAL-WAVE  WAVE-NUM  CEN-WAVELEN  OFFSET      POWER       SNR  
13    4      cband          1            76       155890       -8         -358        302
 
Root Cause
Null.
Suggestions

1.       Eventually, the value of OFFSET should be smaller than or equal to ±2.

2.       According to experience, if the value of OFFSET is negative, increase the AD value. If the value of OFFSET is positive, decrease the AD value. The AD value (such as 00 00 06 09) is eight hexadecimal numbers. Change the first group (09) on the right. Then, change the second group (06) on the right. It is recommended to increase or decrease 10 each time. The value of OFFSET is changed in linear mode.

3.       In the preceding optp commands, the value of bid is hexadecimal. If the OptiX OSN 6800 has master and slave subracks, calculate the value of bid by using the following method.

Assume that the OTU is in slot 13 of slave subrack 1. That is, the slot number is 113. The value of bid is 8 bits in binary. The three bits (001) on the left are the binary number of the subrack number. The five bits (01101) on the right are the binary number of the slot number. Then, the value of bid is 00101101 (namely 2d in the hexadecimal format). 

END