Cisco 3845 Hardware Guide - Page 56

Connecting Source A and Source B with Common Positive Terminals

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Power Connections Note When source A and source B are wired with common negative terminals, as in Figure 17, discharging does not occur and there is no requirement that source A and source B voltages be equal. Figure 18 Connecting Source A and Source B with Common Positive Terminals Va voltage = Vb voltage (greater than 0.25 V) Va voltage = Vb voltage (within 0.25 V) AVa + A+ AVa + A+ + B+ Vb B- + B+ Vb B- 127040 In Figure 19, 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 19. Connecting Cables to Cisco 3800 Series Routers 26 OL-5970-02

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Power Connections
26
Connecting Cables to Cisco 3800 Series Routers
OL-5970-02
Note
When source A and source B are wired with common negative terminals, as in
Figure 17
, discharging
does not occur and there is no requirement that source A and source B voltages be equal.
Figure 18
Connecting Source A and Source B with Common Positive Terminals
In
Figure 19
, 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 19
.
A-
A+
B+
B-
Va
Vb
+
+
127040
A-
A+
B+
B-
Va
Vb
+
+
A-
Va voltage = Vb voltage (within 0.25 V)
Va voltage = Vb voltage (greater than 0.25 V)
A+
B+
B-
Va
Vb
+
+