2-14
Cisco SCE8000 GBE Installation and Configuration Guide
OL-19897-02
Chapter 2 Introduction to the Cisco SCE8000 GBE Platform
The Cisco SCE8000 GBE Optical Bypass
Figure 2-9 PWR-2700-AC/4
Figure 2-10 PWR-2700-DC/4
The AC-input and DC-input power supplies support redundancy. When power is removed from one
supply, the redundant power feature causes the second supply to produce full power.
Power Supply Cooling
Power supplies have built-in fans and are completely self-cooling. Air enters from the right of the fan
and exits through the left.
Load Sharing
With two power supplies, each power supply concurrently provides approximately half of the required
power to the system. If one power supply fails, the second power supply immediately assumes full power
to maintain uninterrupted system operation. The second power supply enables load sharing and fault
tolerance automatically; no software configuration
is required.
126565
Captive installation
screws
PWR-AC
IN
P
U
T
O
K
F
A
N
O
K
O
U
T
P
U
T
F
A
IL
ALL FASTENERS MUST BE FULLY ENGAGED
PRIOR TO OPERATING THE POWER SUPPLY
1
0
0
-2
4
0
V
-1
6
A
5
0
/6
0
H
z
Captive installation
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Captive installation
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Captive installation
screws
PWR-2700-DC/4
-VE-1
-VE-1
-VE-2
-VE-2
IN
P
U
T1
O
K
48V
-60V
=40A
IN
P
U
T2
O
K
48V-60V
=40A
FA
N
O
K
O
U
TP
U
T
FA
IL
ALL FASTENERS MUST BE FU
LLY ENGAGED
PRIOR TO OPERATING THE POW
ER SUPPLY
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