Cisco 3800 Series Quick Start Manual page 23

Integrated services routers

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Figure 18

Connecting Source A and Source B with Common Positive Terminals

Va voltage = Vb voltage (within 0.25 V)

In Figure 19, source A and source B are wired with opposite polarity grounds. Do not use this configuration.

Do not use the DC input configuration shown in Figure 19.

Caution

Figure 19

Source A and Source B Wired with Opposite-Polarity Grounds

Connecting the Router to Backup Power

The Cisco 3845 router operates in redundant mode when two power supplies are installed. The Cisco 3825 router has one

internal power supply and a connector for mating to an external backup power source.

To connect the Cisco 3825 router to the external Cisco Redundant Power System (RPS), remove the RPS connector cover from

the bezel and connect the RPS cable. (See Figure 20 and Figure 21.)

See the Cisco RPS-675 Hardware Installation Guide for more information about RPS power connections. To locate this

documents, see the "Where to Go Next" section on page 34.

Va voltage = Vb voltage (greater than 0.25 V)

A-

A+

B+

B-

A-

A+

B+

B-

A-

A+

B+

B-

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