Cisco WS-C2950T-24 Hardware Installation Guide - Page 106
Connecting Source A and Source B with Common Positive Terminals
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Connecting Power Chapter 3 Installing and Connecting the Router 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 3-24 Cisco 2900 and 3900 Series Hardware Installation OL-18712-01