Blank Cover Panels And Chassis Airflow - Alcatel OmniSwitch 7700 Hardware User's Manual

Chassis Airflow

Blank Cover Panels and Chassis Airflow

Blank cover panels are provided with your switch and are used to cover empty CMM and NI slots, as well
as empty power supply bays. These cover panels play an important role in chassis airflow and temperature
management. If your switch is not fully populated and blank cover panels are not installed over empty slot
locations, airflow is affected. When blank cover panels are missing, air does not take the direct route from
the air intake vents, up through the chassis module compartment, and out through the fan tray. Instead, a
portion of the airflow is allowed to be drawn in through the front module compartment of the chassis. As a
result, normal airflow is disrupted and an extra task is placed on the fan tray to cool the chassis. Refer to
the figure below for more information.
Cover panels also provide protection for module processor boards and other sensitive internal switch
components by closing off a chassis that is not fully populated.
Note. Because they regulate airflow and help protect internal chassis components, blank cover panels
should be installed over empty module slots and power supply bays at all times.
Missing Cover Panels.
Missing cover panels affect
airflow by allowing air to be
drawn in through the front
module compartment of the
chassis. As a result, the direct
route from the air intake
vents to the fan tray exhaust
is disrupted.
For optimal airflow and
chassis component protec-
tion, always install blank
cover panels over empty
module slots and power sup-
ply bays.
Air leakage due to
missing cover panels
page 2-38
Chassis Module
Compartment
Air Intake Vents
Effects of Missing Blank Panels on Chassis Airflow
OmniSwitch 7700/7800 Hardware Users Guide
Chassis and Power Supplies
Fan Tray
April 2005