Cisco Systems 3700 Series manual 3-15, 17 DC Wire Routing and Attachment for Cisco, DSU 56K

Chapter 3 Installing the Router

Power Connections

Figure 3-17 DC Wire Routing and Attachment for Cisco 3725

LP AL

CD

BEFORE INSTALLATION

DSU 56K

SEE MANUAL BEFORE INSTALLATION

88035

Plastic cover

Cable tie	From DC
	power
	source

Approved Scenarios and Scenarios Not Approved for Dual DC Power Supply Configuration in Cisco 3725 Routers

You can connect a single DC power source to either the A input or the B input. If there are dual power sources, connect one source to the A input and one source to the B input. Both sources must be the same polarity (with respect to ground) and voltage (within 0.25 volts). Do not connect –DC grounded and +DC grounded dual sources to a Cisco 3725 router.

Caution Dual sources with opposite-polarity grounding can damage equipment.

In Figure 3-18, either the positive source terminal or the negative source terminal is tied to ground.

Figure 3-18

+

Connecting to One Source Only—Source A or Source B

A- A-

A+	+
	A+

B+	B+
B-	B-

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Cisco 3700 Series Routers Hardware Installation Guide

OL-2180-08 3-15