Power Supply Options - Cisco 3700 Installation Manual

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 Yes
Yes Yes
Yes Yes
1
No Yes
Yes Yes
show the –48 -V power
1-9