# Split ratio calculation for the MON port of the OAU board on OSN 6800

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The split ratio between the MON port and the OUT port is 1:99. In other words, the optical power of the MON port is 20 dB lower than that of the OUT port, which is calculated using the following formula: Pout (dBm) �?Pmon (dBm) = 10 x lg(99/1) = 20 dB.

###### Other related questions:
Split ratio of the MON port on each board on a long-haul DWDM device
For M32, D32, V32, M40, D40, and V40 of each version, the split ratio of the MON port is 1:10 (The difference between the optical power of the MON port and that of the main optical path is 10 dB.) For OAU, OBU, OPU, WBA, WPA, WLA, RPC, RPA, RPL, and FIU of each version, the split ratio of the MON port is 1:99 (The difference between the optical power of the MON port and that of the main optical path is 20 dB.) For HBA of each version, the split ratio of the MON port is 1:999 (The difference between the optical power of the MON port and that of the main optical path is 30 dB.)

NO_BD_PARA alarm on an OAU board on an OSN 6800 NE
Question: Why an OAU board reports a NO_BD_PARA alarm on an OSN 6800 NE of version V100R003 for which ALC is configured? Root cause: None Answer: ALC is inappropriately configured. As a result, the computed value of a required parameter exceeds the maximum OAU gain (31 dB). There is a bug in the software processing mechanism. Due to this bug, when an OAU board uses the extended gain, the value of computed pump current exceeds the maximum value. As a result, a critical alarm is reported. When the software computes the drop-wavelength parameter table and the computed turning point current exceeds the rated current value, the rated current value is used as the turning point current value. Impact: This issue is not triggered under normal configurations. If this issue is triggered, there is no impact on services or functions, and the issue can be rectified by modifying configurations. Version in which the issue has been resolved: V100R003C02B028

Relationship between the optical power and OSNR of BWS 1600G and the split ratio of the MON port on an optical amplifier board
The OSNR is proportional to the incident optical power. The split ratio of the MON port and OUT port on an OA board is 1:99. That is, the power of the MON port is 20 dB lower than that of the OUT port, which can be calculated as follows: Pout (dBm) �?Pmon (dBm) = 10 x l g (99/1) = 20 dB.

Split ratio of MON ports on each board of LH DWDM devices
Question: What is the split ratio of MON ports on each board of LH DWDM devices? Analysis: None Answer: 1. The split ratio of MON ports on M32/D32/V32/M40/D40/V40 boards of each version is 1:10. (The MON ports have a 10 dB optical power difference with the main optical path.) 2. The split ratio of MON ports on OAU/OBU/OPU/WBA/WPA/WLA/RPC/RPA/RPL/FIU boards of each version is 1:99. (The MON ports have a 20 dB optical power difference with the main optical path.) 3. The split ratio of MON ports on HBA boards of each version is 1:999. (The MON ports have a 30 dB optical power difference with the main optical path.) Suggestion and conclusion: None

Split ratio of the MON port on the FIU board
For TN11FIU, TN12FIU, TN13FIU01, TN14FIU, and TN21FIU boards, the split ratio between the MON port and OUT port is 1:99. In other words, the optical power of the MON port is 20 dB lower than that of the OUT port, which can be calculated using the following formula: Optical power (dBm) of the OUT port �?Optical power (dBm) of the MON port = 10 x lg(99/1) = 20 dB. For the TN13FIU02 board, the split ratio between the MON port and OUT port is 0.1:99.9. In other words, the optical power of the MON port is 30 dB lower than that of the OUT port, which can be calculated using the following formula: Optical power (dBm) of the OUT port �?Optical power (dBm) of the MON port = 10 x lg(99.9/0.1) = 30 dB.

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