Cisco 2821 - Integrated Services Router Unified Communications Bundle Quick Start Manual - Page 25
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When source A and source B are wired with common negative terminals, as in Figure 22, discharging does not occur
Note
and there is no restriction requiring that source A and source B voltages be equal.
Figure 23
Connecting Source A and Source B with Common Positive Terminals
Va voltage = Vb voltage (within 0.25 V)
Va
+
+
Vb
In Figure 24, 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 24.
Figure 24
Source A and Source B Wired with Opposite-Polarity Grounds
Va
Va
+
+
+
+
Vb
Vb
Va voltage = Vb voltage (greater than 0.25 V)
A-
A+
B+
B-
A-
A-
A+
A+
B+
B+
B-
B-
A-
A-
Va
Va
+
+
A+
A+
B+
B+
+
+
Vb
Vb
B-
B-
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