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The XCE on the extended subrack of an OptiX OSN 3500 NE is frequently reset due to a voltage defect on the board

Publication Date:  2012-07-25 Views:  78 Downloads:  0
Issue Description
On an OptiX OSN 3500 NE of NE version, the XCE on the extended subrack is reset. At the same time, the NE reports the BD_STATUS alarm. One minute later, the NE reports the going-online event and HSC_UNAVAIL alarm. The HSC_UNAVAIL alarm disappears four minutes later. 
Alarm Information
Handling Process
 Replace the XCE with an XCE manufactured after April 2007. 
Root Cause
The 1.8 V voltage supply is designed too high for the SSN1XCE. The OptiX OSN 3500 has tightened voltage detection since V100R006. Therefore, the high voltage supply is prone to crossing the threshold. In addition, instead of being as direct as a line, the wave of a DC power supply is subject to fluctuations and burrs. Therefore, the DC power supply requires a reasonable voltage allowance. If the allowance is too low, the voltage is likely to cross the threshold and to cause the board to reset. This problem is common to the XCEs manufactured before April 2007.