NEC SV8500 Operation And Maintenance Manual - page 491
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CHAPTER 3
System Messages
33-E: SDT Interface Change Notify
This message displays when the ACT/STBY of the SDT (PA-SDTA) card is changed over as a result of fault
detection in the optical fiber line. When the ACT/STBY change cannot be performed, this message also
indicates the cause for the changeover execution failure.
Module Group (MG)
Detailed information
Cause for changeover execution failure
Repair Procedure
Once this message displays, be sure to check other messages, such as [33-C] SDT Alarm Trouble, and review
the cause for the changeover. If any fault is implicated, repair the whole fault(s) according to the situation.
Default Alarm
Default Grade
Grade Modified
Lamp Modified
NON
2
1:
X0XX
XX00
0000
0000
2:
0000
0000
0000
0000
3:
0000
0000
0000
0000
4:
0000
0000
0000
0000
5:
0000
0000
0000
0000
6:
0000
0000
0000
0000
7:
0000
0000
0000
0000
8:
0000
0000
0000
0000
9:
0000
0000
0000
0000
b7
b0
b7
b6
b5
b4
b3
b2
b1
b0
b7
b6
b5
b4
b3
b2
b1
b0
3
1 2
b7:
0/1 = Even-number MG/Odd-number MG
1
b0:
Active SDT after Changeover
0/1=System 0/System 1
b1:
Operating Status of SDT
0/1=In service/Out of service
b2, b3:
Result of Changeover
0/1=Success/Failure
b7-b4
Cause for Changeover
0001
SDT had a serious failure
0010
MB key on SDT card was turned ON
2
3
0H:
(Changeover Success)
1H:
Optical interface is not dual
2H:
Optical interface has a serious failure in each System 0/1