75
8 Power Redundancy
T64 Subrack Power Redundancy
a
I
U
1
I
U
2
I
U
3
I
U
4
I
U
5
I
U
6
I
U
7
I
U
8
I
U
9
IU
10
IU
11
IU
12
IU
13
IU
14
IU
15
IU
16
IU
17
IU
18
IU
19
IU
20
IU
21
IU
22
IU
23
IU
24
IU
25
IU
26
IU
27
IU
28
IU
29
IU
30
IU
31
IU
32
IU
33
IU
34
IU71
EFI2
STG
IU75
IU74
IU91
SCC
A
U
X
IU
72
IU
73
IU
76
IU
77
EFI
1
I
U
3
5
I
U
3
6
I
U
3
7
I
U
3
8
I
U
3
9
I
U
4
0
I
U
4
1
I
U
4
2
I
U
4
3
IU
44
IU
45
IU
46
IU
47
IU
48
IU
49
IU
50
IU
51
IU
52
IU
53
IU
54
IU
55
IU
56
IU
57
IU
58
IU
59
IU
60
IU
61
IU
62
IU
63
IU
64
IU
65
IU
66
IU
67
IU
68
IU82
STI
STG
IU86
IU85
IU93
SCC
A
U
X
IU
83
IU
84
IU87
ATE
IU90
IU92
PIU
IU70
PIU
IU69
IU79
PIU
IU78
PIU
PIU
IU81
PIU
IU80
IU89
PIU
IU88
PIU
Mutual backup DC input for area 2
Two PIU boards in hot backup mode supply power to one subrack at the same time. When one of the PIU boards becomes faulty,
the other PIU board continues to supply power to the subrack to ensure that the subrack can still function properly. Each area is
configured with a pair of power supplies in mutual backup.
Mutual backup DC input for area 1
Mutual backup DC input for area 4
Mutual backup DC input for area 3
Power distribution and redundancy for the general OptiX OSN 8800 T64 subrack
Front
Rear
•
For the T64 Enhanced subrack, the PIU boards installed back-to-back are in mutual backup.
•
For the T64 General, T32, and T16 subracks, PIU boards on the left and right sides are in mutual backup.
•
For the universal platform subracks, the PIU boards are installed on the right side and the upper and lower PIU boards are in
mutual backup.
•
For details of the backup relationships between PIU boards, see the "Power Redundancy" section.
CAUTION
