Cisco WS-C2950T-24 Hardware Installation Guide - Page 110
Dual DC Power Supply Configuration in Cisco 3925 and Cisco 3925-NOVPN Routers
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Connecting Power Chapter 3 Installing and Connecting the Router Figure 3-29 DC Wire Routing andAttachment for Cisco 3925 and 3925-NOVPN Router Figure 3-30 DC Wire Routing and Attachment for Cisco 3945 and 3945-NOVPN Router 279996 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. Caution Dual sources with opposite-polarity grounding damage equipment. In Figure 3-31, either the positive source terminal or the negative source terminal is tied to ground. 3-28 Cisco 2900 and 3900 Series Hardware Installation OL-18712-01