Cisco 2900 Series Installation Manual page 110

Connecting Power
Figure 3-27
Figure 3-28
Dual DC Power Supply Configuration in Cisco 3925 and Cisco 3925-NOVPN 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 have the
same polarity (with respect to ground) and voltage (within 0.25 V). Do not connect -DC-grounded and
+DC-grounded dual sources to Cisco 3925 and Cisco 3925-NOVPN routers.
Dual sources with opposite-polarity grounding damage equipment.
Caution
Cisco 2900 and 3900 Series Hardware Installation
3-28
DC Wire Routing andAttachment for Cisco 3925 and 3925-NOVPN Router
DC Wire Routing and Attachment for Cisco 3945 and 3945-NOVPN Router
Chapter 3 Installing and Connecting the Router