Cisco 3700 Series Hardware Installation Manual page 61

Chapter 3 Installing the Router
Figure 3-17
Plastic cover
Approved Scenarios and Scenarios Not Approved for Dual DC Power Supply Configuration in Cisco 3725 Routers
You can connect a single DC power source to either the A input or the B input. If there are dual power
sources, connect one source to the A input and one source to the B input. Both sources must be the same
polarity (with respect to ground) and voltage (within 0.25 volts). Do not connect –DC grounded and +DC
grounded dual sources to a Cisco 3725 router.
Dual sources with opposite-polarity grounding can damage equipment.
Caution
In Figure
Figure 3-18
+
OL-2180-08
DC Wire Routing and Attachment for Cisco 3725
BE FO R E
D S U
IN ST AL LA
TI O N 56 K
SE E M AN
UA L BE FO
R E IN ST
3-18, either the positive source terminal or the negative source terminal is tied to ground
Connecting to One Source Only—Source A or Source B
A-
A+
B+
B-
AL LA TI O
N
From DC
Cable tie
power
source
+
Cisco 3700 Series Routers Hardware Installation Guide
Power Connections
A-
A+
B+
B-
.
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