Cisco 3745 Guía de instalación descargar pdf (Pagina 10)

Installing Field-Replaceable Units in Cisco 3745 Routers

78-14308-02

Replacing Cisco 3745 Chassis Power Supplies

The Cisco 3745 router can accommodate two AC or two DC power supplies to supply power to the

chassis. Each unit provides up to 230 watts of power, and a single installed power supply meets the

router’s requirements under most operating conditions. The second power supply provides redundancy,

load sharing, and increased system availability. It can be removed without affecting system operation.

Note The Cisco 3745 router also can accommodate two power modules that provide –48VDC power for

telephony applications. A separate installation document contains installation procedures for these

power modules.

Figure 1 shows the AC power supply for the Cisco 3745 router.

Figure 2 shows the DC power supply for the Cisco 3745 router.

Figure 3 shows Cisco 3745 power connections.

Figure 4 shows the location of the power supply in the Cisco 3745 routers. AC and DC power supplies

occupy the same locations in the router.

To remove and install power supplies, perform the following procedures, as required:

• Removing a Cisco 3745 Chassis Power Supply, page 13

• Installing a Cisco 3745 Chassis Power Supply, page 17

• Connecting DC-Input Power, page 18

Observe the following precautions when removing or installing power supplies:

Warning

Do not touch the power supply when the power cord is connected. For systems with a power switch,

line voltages are present within the power supply even when the power switch is off and the power

cord is connected. For systems without a power switch, line voltages are present within the power

supply when the power cord is connected. To see translations of the warnings that appear in this

publication, refer to the

Regulatory Compliance and Safety Information

document that accompanied

this device.

Warning

Donotworkonthe system orconnect or disconnect cables during periods of lightning activity.To see

translations of the warnings that appear in this publication, refer to the

Regulatory Compliance and

Safety Information

document that accompanied this device.

Warning

Hazardous network voltagesare present inWAN ports regardlessof whether power to the unit isOFF

or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables,

detach the end away from the unit first. To see translations of the warnings that appear in this

publication, refer to the

Regulatory Compliance and Safety Information

document that accompanied

this device.

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