Cisco TelePresence Server 7010 Installation Instructions Manual - Page 6
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Prerequisites
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Ventilation
Planning a proper location for the router and the layout of your equipment rack is essential for
successful system operation. Equipment placed too close together or inadequately ventilated can
cause overtemperature conditions inside the chassis. When viewing the chassis from the interface
processor end, the inlet air is drawn in through the right side of the chassis, and the exhaust air is
forced out of the left side.
To help avoid overtemperature conditions, consider the following precautions when planning your
rack installation:
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The environmental monitoring functions provide status reports and warning messages about the
internal chassis environment. For a description of the environmental monitor functions and related
commands, refer to the Cisco 7010 Hardware Installation and Maintenance or Cisco 7505
Hardware Installation and Maintenance publications.
General Precautions
In addition to the preceding guidelines and precautions, follow these general precautions when
planning your rack installation:
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6 Cisco 7010 and Cisco 7505 Rack-Mount and Cable Management Kits Installation Instructions
If the rack has a vertical power strip or other obstacle, ensure that there is sufficient clearance to
install and remove processor modules. Allow at least 12 inches of clearance to pull the modules
straight out of their slots.
When mounting the chassis in four-post or Telco-type racks, be sure to use all eight of the screws
provided to secure the chassis ears to the rack posts (use four screws per ear). The ears secure
one end of the chassis to two rack posts, and the rest of the chassis is cantilevered off of the posts.
Using fewer than eight screws might not be sufficient to support the weight of the chassis.
Install the router in an open rack whenever possible. If installation in an enclosed rack is
unavoidable, ensure that the rack has adequate ventilation.
Maintain a minimum clearance of 2 inches on each side of the chassis for the cooling air inlet
and exhaust ports. Avoid placing the router in an overly congested rack or directly next to another
equipment rack. Otherwise, the heated exhaust air from other equipment can enter the inlet air
vents and cause an overtemperature condition inside the router.
Equipment near the bottom of a rack may generate excessive heat that is drawn upward and into
the inlet ports of equipment above, leading to overtemperature conditions in devices at or near
the top of the rack.
A ventilation system that is too powerful in a closed rack may also prevent cooling by creating
negative pressure around the chassis and redirecting the air away from the inlet vents. If
necessary, operate the chassis with the door or access panel open.
The correct use of baffles in an enclosed rack can help to ensure that cool air reaches the chassis.
Install heavier equipment in the lower half of the rack to maintain a low center of gravity,
particularly in mobile racks. Never install equipment in the upper half of an otherwise empty
rack.
Allow sufficient clearance around the rack for maintenance. If the rack is mobile, you can push
it back near a wall or cabinet for normal operation and pull it out when necessary for maintenance
(installing or moving interface processors, connecting cables, or replacing or upgrading internal
components). Poor equipment placement can make system maintenance difficult.
When moving mobile racks that contain heavy devices such as the chassis, push the rack from
the bottom or lower half to avoid tipping it or causing it to become unstable.