Environmental Site Requirements - Cisco Universal Broadband Router uBR10012 Hardware Installation Manual

Chapter 2 Preparing for Installation

Environmental Site Requirements

The environmental monitoring functionality in the Cisco uBR10012 router protects the system and
components from potential damage from excessive voltage and temperature conditions. To ensure
normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site
before installation. After installation, make sure the site maintains an ambient temperature of 41°F
through 104°F (5°C through 40°C), and keep the area around the chassis as free from dust as is practical.
Planning a proper location for the Cisco uBR10012 router and the layout of your equipment rack or
wiring closet is essential for successful system operation. Equipment placed too close together or
inadequately ventilated can cause system excessive temperature conditions. In addition, chassis panels
made inaccessible by poor equipment placement can make system maintenance difficult.
When you plan the location and layout of your equipment rack or wiring closet, you need to consider
how air flows through your router. The Cisco uBR10012 router draws cooling air in through the intake
vent on the front of the chassis and moves the air across the internal components and out the exhaust
vents on the top rear of the chassis (see
Temperature sensors on the PRE monitor the internal air temperature and send warning messages and an
alarm condition when the internal air temperature approaches a specified threshold.
The front bottom and top rear of the chassis must remain unobstructed to ensure adequate airflow and
prevent overheating inside the chassis. Maintain a minimum clearance of 3 in. (7.62 cm) from the vents
on the front and back of the chassis to allow for adequate airflow. Do not place the chassis where heated
exhaust air from other systems could enter the air intake vent at the bottom front, as this could cause
overheating of the system.
In addition, allow for approximately 3 to 4 ft (91.44 cm to 121.92 cm) clearance at the front and rear of
the chassis for cabling and normal system maintenance.
Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to
hazardous voltages and currents inside the chassis; they contain electromagnetic interference (EMI)
that might disrupt other equipment; and they direct the flow of cooling air through the chassis. Do not
operate the system unless all cards, faceplates, front covers, and rear covers are in place. Statement
1029
To avoid problems during installation and ongoing operation, follow these general precautions when you
plan the equipment locations and connections:
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Use the show environment command regularly to check the internal system status. The
environmental monitor continually checks the interior chassis environment; it provides warnings for
high temperature and creates reports on any occurrences. If warning messages are displayed, take
immediate action to identify the cause and correct the problem.
Keep the Cisco uBR10012 router off of the floor and out of areas that collect dust.
Follow ESD prevention procedures (see
page 2-2) to avoid damage to equipment. Damage from static discharge can cause immediate or
intermittent equipment failure.
Ensure that the PRE modules, line cards, blank covers, power supplies, and any power supply covers
are in place and secure. The fans direct cooling air throughout the chassis interior; a loose
component or empty slot can redirect the airflow away from active components.
Figure 2-1 on page
"Preventing Electrostatic Discharge Damage" section on
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
Site Requirements
2-6).
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