3-24
Cisco 2900 and 3900 Series Hardware Installation
OL-18712-01
Chapter 3 Installing and Connecting the Router
Connecting Power
can cause one or both of the dual input DC power supply's internal A- or B- fuses to open, resulting in
lack of redundancy or system failure. When source A and source B are within 0.25 V, discharge current
is minimal.
Note
When source A and source B are wired with common negative terminals, as in Figure 3-24, discharging
does not occur and there is no restriction requiring that source A and source B voltages be equal.
Figure 3-25 Connecting Source A and Source B with Common Positive Terminals
In Figure 3-26, source A and source B are wired with opposite polarity grounds. Do not use this
configuration.
Caution
Do not use the DC input configuration shown in Figure 3-26.
Figure 3-26 Source A and Source B Wired with Opposite-Polarity Grounds
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