5
3 Site Preparation
Check the following:
•Site is capable of maintaining an ambient temperature of 32 to 104 degrees Fahrenheit
•Site power is available and adequate
•Cabling requirements (type, distance)
•Rack-mounting requirements (working space, proper airflow)
Site Environment
Warning
This unit is intended for installation in restricted access areas. A restricted access area can be accessed only
through the use of a special tool, lock and key, or other means of security.
Statement 1017
Warning
This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations.
Statement 1045
Temperature and Humidity Requirements
Table1 lists the nominal operating and nonoperating environment req uirements. Any measurements that approach the
minimum or maximum of a range indicate a potential problem.
Table1 Operating and Nonoperating Environments
Power Guidelines
Follow these precautions and recommendations when planning power connections to the Cisco uBR7246VXR router:
•Check the power at your site before installation and periodically after installation to ensure that you are receiving clean
power. Install a power conditioner if necessary.
•Provide proper grounding.
•Make sure that the frame ground is tied to a single building ground.
•Use a 6-AWG, copper ground conductor (minimum requirement) when attaching the chassis ground to a headend or other
interior ground system.
Warning
A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.
Statement 1022
Specification Minimum Maximum
Temperature, ambient operating
Temperature, ambient nonoperating and storage
32° F (0° C)
-4° F (-20° C)
104° F (40° C)
149° F (65° C)
Humidity, ambient (nonconducting) operating 10% 90%
Humidity, ambient (noncondensing) nonoperating and storage 5% 95%
Altitude, operating and nonoperating –197 ft (–60 m) 13,123 ft (4000 m)
Vibration, operating — 5 to 200 Hz, 0.5 g (1 octet/min.)
Vibration, nonoperating — 5 to 200 Hz, 1 g (1 octet/min.)
200 to 500 Hz, 2 g (1 octet/min.)