NEC SV8500 Operation And Maintenance Manual - page 379
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CHAPTER 3
System Messages
[52H] Trunk Ineffective Hold Detected Impossible
Error detection by Routine
Diagnosis
Cause for suspended detection of
Trunk Ineffective Hold
1:
5200
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
b2
b1
b0
1
2
[52H] Trunk Ineffective Hold Detected Impossible
1
01H: The CPU to detect is abnormal
02H: Data transfer error
03H: No Answer error
04H: Data transfer error by PS - Trunk Ineffective Hold
2