Cisco WS-C2950-24 Installation Manual page 106

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.
When source A and source B are wired with common negative terminals, as in
Note
does not occur and there is no restriction requiring that source A and source B voltages be equal.
Figure 3-25
In Figure
configuration.
Do not use the DC input configuration shown in
Caution
Figure 3-26
Cisco 2900 and 3900 Series Hardware Installation
3-24
Connecting Source A and Source B with Common Positive Terminals
3-26, source A and source B are wired with opposite polarity grounds. Do not use this
Source A and Source B Wired with Opposite-Polarity Grounds
Chapter 3 Installing and Connecting the Router
Figure 3-26.
Figure 3-24, discharging
OL-18712-01