6
Cable Connection Procedures for Cisco 2800 Series Routers
OL-5787-02
Power Connections
Figure 3 Wire Routing and Attachment for Cisco 2821 and Cisco 2851 Routers
Approved Scenarios and Scenarios Not Approved for Dual DC Power Supply Configuration in Cisco
2800 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 Cisco 2811, Cisco 2821, and Cisco 2851 routers.
Caution Dual sources with opposite-polarity grounding damage equipment.
CONSOLE
AUX
A
B
-
+
+
-
24-60V --- 12A
From DC
power
source
Cable tie
0
1
111815
Plastic covers
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