Alcatel-Lucent 7750 SR-a4, Руководство по установке, Страница: 179 / 232

Appendix C: Field-Replaceable Units
7750 SR-a4 and SR-a8 Installation Guide 179
Figure 61: Removing a –48 VDC PSU (7750 SR-a8)
To remove a –48 VDC PSU module:
Step 1. Ensure external power has been disconnected or turned off at the branch circuit
device. The status LED on the faceplate (Key 1 in
Figure 60 or Figure 61 ) of the
–48 VDC PSU module must be unlit.
See
7750 SR-a –48 VDC PSU LED and Connectors for more information.
Step 2. Remove the protective cover from the terminal block (Key 4 in Figure 62 ).
Table 90: –48 VDC PSU Removal Features
Key Description
1 LED
2 PSU handle
3 Spring-loaded latch lock
4 Direction of movement
7750
S R-a4 Fan Tray
Pwr
S
tat
S lot Layout
1/1 XP
1/2
1/3
1/4
2/1 XP
1
2/2 XP
2/3
2/4
CPM A
2
CPM B
7750 SR-a8
S ervice Router
Pwr
Stat
Pwr
Stat
7750
M
DA
-aXP
10
-1
0G
B
-S
F
P
+
10
Lnk Act
9
Lnk Act
8
Lnk Act
7
Lnk Act
6
Lnk Act
5
Lnk Act
4
Lnk Act
3
Lnk Act
2
Lnk Act
1
Lnk Act
Pwr
7750
M
DA
-aXP
6-
10
G
B-
S
FP
+
1-
40
G
B-
Q
S
FP
+
Stat
6
Lnk Act
7
Lnk Act
5
Lnk Act
4
Lnk Act
3
Lnk Act
2
Lnk Act
1
Lnk Act
Pwr
77
50
M
D
A
-a
4-
10
G
B-
S
FP
+
Stat
3
Lnk Act
4
Lnk Act
1
Lnk Act
2
Lnk Act
Pwr
7750 M
D
A-a
44
-1
G
B
-
C
S
F
P
/S
F
P
Stat
Lnk/Act
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
25 26 27 28
29 30 31 32
33 34 35 36
37 38 39 40
41 42 43 44
17 18 19 20
21 22 23 24
Pwr
7750
M
D
A
-a
20-1
G
B
-T
X
Stat
Lnk
1
Act
2 Lnk
3 Act
4
Lnk
5
Act
6 Lnk
7
Act
8 Lnk
9 Act
10
Lnk
11
Act
12
Lnk
13
Act
14 Lnk
15 Act
16
Lnk
17
Act
18 Lnk
19
Act
20
Pwr
7750 M
D
A-a
12
-1
G
B
-S
F
P
2-1
0G
B
-S
F
P
+
Stat
Lnk/Act
1
2 3
4
5
6 7
8 9
10
11
12 Lnk
Act
13
14
Lnk Act
Pwr
77
50
M
D
A-
a
4-
10
G
B-
S
FP
+
Stat
3
Lnk Act
4
Lnk Act
1
Lnk Act
2
Lnk Act
Pwr
7
7
5
0
SR-a
Stat
Sy
n
cE/
15
88
Alarms
1PPS
ACO/LT
Critical
Lnk DTE
Pwr
7
7
5
0
C
P
M-
a
Stat
Console Mgmt
O
ES
B
IT
S
Compact Flash
DCE Act Lnk
Act
Major
Minor
S
yn
cE/1
58
8
Alarms
1PPS
ACO/LT
Critical
Lnk DTE
Pwr
7
7
5
0
C
P
M-a
Stat
Console M
gmt
O
E
S
B
ITS
Compact Flash
DCE Act Lnk
Act
Major
Minor
Pwr
7
7
5
0
M
D
A
-a
X
P
1
-1
0
0
G
B-CF
P
Stat
Lnk
A
ir
F
ilt
er
A
c
c
es
s
77
50
S
R
-a
8
2
4 3
245 8 3
1