General Site Requirements
4
Preinstallation Requirements and Planning for Cisco 3800 Series Routers
OL-5967-01
Warning
The device is designed for connection to TN and IT power systems.
Statement
1007
The AC power supply autoselects either 110 V or 220 V operation. All routers include a 6-foot
(1.8-meter) electrical power cord. A label near the power inlet indicates the correct voltage, frequency
(AC-powered systems only), and current draw for the router.
Table 1 lists power requirements for Cisco 3800 series routers.
Site Environment
Cisco 3800 series routers should normally be installed in an equipment rack. (For instructions, see
“Installing Cisco 3800 Series Routers in an Equipment Rack.”) The location of your router and the
layout of your equipment rack or wiring room are extremely important considerations for proper
operation. Equipment placed too close together, inadequate ventilation, and inaccessible panels can
cause malfunctions and shutdowns, and can make maintenance difficult. Plan for access to both front
and rear panels of the router.
Cisco 3800 series routers operate at a temperature of 32 to 104 degrees F (0 to 40 degrees C) and a
humidity of 5 to 95 percent (noncondensing).
When planning your site layout and equipment locations, remember the precautions described in the next
section, “Site Configuration,” to help avoid equipment failures and reduce the likelihood of
environmentally caused shutdowns. If you are experiencing shutdowns or an unusually high number of
errors with your existing equipment, these precautions may help you isolate the cause of the failures and
prevent future problems.
Table 1 Power Requirements for Cisco 3800 Series Routers
Router Power Supply Input Power Input Voltage
Tolerance Limits
Cisco 3825
without IP
phone power
output
AC 100 to 240 VAC
3 A at 110 V; 2 A at 230 V
47 to 63 Hz
85–264 VAC
DC 24 to 60 VDC, positive or negative, autoranging
12 A at 24 V; 5 A at 60 V
18–72 VDC
Cisco 3825
with IP phone
power output
AC 100 to 240 VAC
8 A at 110 V; 4 A at 230 V
47 to 63 Hz
85–264 VAC
Cisco 3845
without IP
phone power
output
AC 100 to 240 VAC
4 A at 110 V; 2 A at 230 V
47 to 63 Hz
85–264 VAC
DC 24 to 60 VDC, positive or negative, autoranging
19 A at 24 V; 8 A at 60 V
18–72 VDC
Cisco 3845
with IP phone
power output
AC 100 to 240 VAC
9 A at 110 V; 4 A at 230 V
47 to 63 Hz
85–264 VAC
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