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Problem Description
A customer's network uses 2 sets of OSN3500 to expand 2 2.5G optical boards, two N3SL16 single boards to open a 2.5G channel, the model number and version of the 2.5G optical board are as follows: 03030EPY -OptiX OSN 3500,SSN3SL1603,STM-16 Optical Interface Board (V-); single board software version 5.12, logic version is: 110; The software version of the single board matches the version of the main control board, the engineering supervisor has to check the version of the single board. 16.2Je,LC);
The software version of the single board is 5.12, and the logic version is: 110;
The software version of this single board is matched with the version of the main control board, and the engineering supervisor installs these two single boards in the 2 sets of OSN3500 equipment, and the optical power reception is qualified, both around -18dbm, but it is found that both 2.5G optical boards receive regenerative segment error codes.
The software version of the single board is 5.12, and the logic version is: 110;
The software version of this single board is matched with the version of the main control board, and the engineering supervisor installs these two single boards in the 2 sets of OSN3500 equipment, and the optical power reception is qualified, both around -18dbm, but it is found that both 2.5G optical boards receive regenerative segment error codes.
Warning MessageThere is no alarm information, and the single board reports regenerative segment error code at 15 minutes of current performance during the performance query.
Processing1, at that time suspect that there is a problem with the fiber optic cable, the customer swap cable, the problem remains;
2, the actual distance of the fiber optic cable is 110km, while the single board nominal support 140km, the distance is within a reasonable range, while the optical power is normal.
3, both sides of the N3SL1603 optical board plus 20db light failure self-loop, without any error code reported;
4, one side of the N3SL1603 optical board to replace the N1SL1603 V-16.2Je, the regeneration section of the opposite end of the N3SL1603 error code disappeared, but the end of the N1SL1603 or regeneration section of the error code;
5, and then replace the opposite side of the N3SL1603 optical board After replacing N1SL1603 V-16.2Je with N1SL1603 optical board of the opposite end, the regeneration section error code of this end disappears.
6, after R & D positioning, judged to be a single board version of the problem: single board logic version of 130 and below SSN3SL16 V-16.2Je single board due to the optical module scrambling signal design reasons lead to long-distance transmission may produce a small amount of BER, affecting the transmission performance.
7. Upgrade the FPGA of SSN3SL16 V-16.2Je to 200, and at the same time, upgrade the software of single board, the BER will disappear.
2, the actual distance of the fiber optic cable is 110km, while the single board nominal support 140km, the distance is within a reasonable range, while the optical power is normal.
3, both sides of the N3SL1603 optical board plus 20db light failure self-loop, without any error code reported;
4, one side of the N3SL1603 optical board to replace the N1SL1603 V-16.2Je, the regeneration section of the opposite end of the N3SL1603 error code disappeared, but the end of the N1SL1603 or regeneration section of the error code;
5, and then replace the opposite side of the N3SL1603 optical board After replacing N1SL1603 V-16.2Je with N1SL1603 optical board of the opposite end, the regeneration section error code of this end disappears.
6, after R & D positioning, judged to be a single board version of the problem: single board logic version of 130 and below SSN3SL16 V-16.2Je single board due to the optical module scrambling signal design reasons lead to long-distance transmission may produce a small amount of BER, affecting the transmission performance.
7. Upgrade the FPGA of SSN3SL16 V-16.2Je to 200, and at the same time, upgrade the software of single board, the BER will disappear.
Root CauseSSN3SL16 V-16.2Je single board with single board logic version 130 and below will generate a small amount of BER during long-distance transmission due to the design of the perturbation signal of the optical module. on the SSN3SL16 single board, the FPGA will send the perturbation signal to the optical module, which has already suppressed the nonlinear effect to a certain extent, and the external perturbation is equivalent to the suppression of the excess, and the eye diagram will become poorer . The eye diagram will become worse, thus generating BERs.
Recommendations and SummarySSN3SL16 V-16.2Je boards with single board logic version 130 and below may generate a small amount of BER during long distance transmission due to the design of the scrambling signal of the optical module, which may affect the transmission performance.
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