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Chapter 1

Overview of Cisco 3700 Series Routers

Power Supply Options

Table 1-3

configuration specified when you placed your order, your router may not support all of these options.

Table 1-3

Power Supply Option

AC input power

DC input power

–48-V telephony power module to provide inline power to IP phones

Dual hot-swappable power supplies

Compatible with Cisco Redundant Power System

1. Because of increased power consumption in high-temperature environments, a fully loaded Cisco 3745 router requires both

Internal –48 V Telephony Power Modules

Cisco 3700 series routers provide inline power to IP phones connected to the router through Ethernet

switch network modules. This power is supplied by special –48 V modules that connect directly to the

chassis power supplies in Cisco 3725 and Cisco 3745 routers. A single –48 V power module meets the

power needs of up to 36 IP phones. A Cisco 3745 router with two –48 V power modules installed

provides redundant power for up to 36 IP phones.

modules as they appear when installed in Cisco 3700 series routers.

OL-2180-08

lists the power supply options supported by Cisco 3700 series routers. Depending on the

Power Supply Options for Cisco 3700 Series Routers

power supplies when ambient temperature exceeds 104˚F (40˚C). Cisco 3745 routers operating under these conditions do not

support the online replacement of power supplies.

Figure 1-5

and

Figure 1-6

Cisco 3700 Series Routers Hardware Installation Guide

Power Supply Options

Cisco 3725

Cisco 3745

Yes

show the –48 -V power

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