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Lower order errors occur due to a problem with the cables between the main and extended subracks

Publication Date:  2012-07-25 Views:  41 Downloads:  0
Issue Description
An OptiX OSN 3500 NE has an extended subrack. During switchover between the active and standby cross-connect boards, the following scenarios occurs:
 If the cross-connect boards in slots 9 and 60 are active, the tributary boards in the extended slots report the BIP_SD alarm and LPBBE, LPES, LPUAS, and LPFEES errors.
If the cross-connect boards in slots 9 and 59 are active, the tributary boards in the extended slots do not report the BIP_SD alarm or LPBBE, LPES, LPUAS, or LPFEES error.
If the cross-connect boards in slots 10 and 59 are active, the tributary boards in the extended slots report the BIP_SD alarm and LPBBE, LPES, LPUAS, and LPFEES errors.
If the cross-connect boards in slots 10 and 60 are active, the tributary boards in the extended slots do not report the BIP_SD alarm or LPBBE, LPES, LPUAS, or LPFEES error. 
 
Alarm Information
 BIP_SD, LPBBE, LPES, LPUAS, LPFEES 
Handling Process
Replace the cables between slots 9 and 60 and between slots 10 and 59 with new cables. The alarm and errors disappear. A switching test shows that no alarm or error is reported and that the fault disappears. 
Root Cause
The high-speed cables between the main and extended subracks are connected as follows:
Upper interface-UXCSB-slot 9 ― upper interface-XCE-slot 59
Lower interface-UXCSB-slot 9 ― upper interface-XCE-slot 60
Upper interface-UXCSB-slot 10 ― lower interface-XCE-slot 59
Lower interface-UXCSB-slot 10 ― lower interface-XCE-slot 60
If the cross-connect boards in slots 9 and 59 or in slots 10 and 60 are active, no alarm or error is reported. If the cross-connect boards in slots 9 and 60 or in slots 10 and 59 are active, however, the tributary boards on the extended subrack report the BIP_SD alarm and LPBBE, LPES, LPUAS, and LPFEES errors. Therefore, the problem is free from the XCSs and XCEs. The combinations differ in only the connecting cables. Therefore, engineers suspect that something is wrong with the cables between the main and extended cables. 
 
Suggestions
To solve the errors of an extended subrack, try replacing the cables between the cross-connect boards on the main subrack and the cross-connect boards on the extended subrack. 

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