Cisco Systems 3700 specifications Power Supply Options, Internal -48 V Telephony Power Modules

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Chapter 1 Overview of Cisco 3700 Series Routers

Power Supply Options

Power Supply Options

Table 1-3lists the power supply options supported by Cisco 3700 series routers. Depending on the configuration specified when you placed your order, your router may not support all of these options.

Table 1-3

Power Supply Options for Cisco 3700 Series Routers

 

 

 

 

 

Power Supply Option

Cisco 3725

Cisco 3745

 

 

 

 

AC input power

 

Yes

Yes

 

 

 

DC input power

Yes

Yes

 

 

 

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

Yes

Yes

 

 

 

Dual hot-swappable power supplies

No

Yes1

Compatible with Cisco Redundant Power System

Yes

Yes

 

 

 

 

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

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. Figure 1-5and Figure 1-6show the –48 -V power modules as they appear when installed in Cisco 3700 series routers.

Cisco 3700 Series Routers Hardware Installation Guide

 

OL-2180-08

1-9

 

 

 

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Contents Cisco Hardware Features1shows the rear panel of the Cisco 3725 router 2shows the rear panel of the Cisco 3745 router Modules, Interface Cards, and MemoryMemory Description SpecificationCisco 3725 Interfaces Interface NumberingVoice Interface Numbering Cisco 3745 Interfaces Network-module-slot/voice-module-slot/voice-interface Internal -48 V Telephony Power Modules Power Supply OptionsCisco 3725 Router with Optional -48 V Power Module Installed System Specifications Regulatory Compliance
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