Cisco 3000 Series, Hardware Installation And Maintenance

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General
Site
Requirements
Site
Environment
The
location of individual chassis
and
the
layout
of
your equipment
rack
or wiring
room
are
extremely important
for proper
system
operation
Equipment
placed
too close together inadequate
ventilation
and
inaccessible panels can
cause
system
malfunctions
and shutdowns and
can
make
system
maintenance difficult
When
planning
your
site
layout
and equipment
locations
use
the following precautions to help avoid
equipment
failures
and
reduce the likelihood of environmentally caused
shutdowns
If
you
are
currently experiencing
shutdowns
or unusually high
errors
with
your existing
equipment these
precautions
may
help you isolate
the cause of
failures
and
prevent
future problems
Preventive
Site Configuration
The
following precautions
will
help
you
plan an acceptable operating environment
for
your router
and
will
help
you
avoid
environmentally
caused
equipment
failures
Remember
that electrical equipment
generates
heat Ambient
air
temperature
might not
be
adequate
to
cool
equipment to
acceptable operating temperatures
without
adequate
circulation
Ensure
that
the room in
which you
operate your system
has adequate
air
circulation
Always
follow the
ESD-prevention
procedures
in
the section
Preventing Electrostatic
Discharge
Damage
to
avoid
damage
to
equipment
Damage
from
static
discharge
can cause
immediate
or intermittent equipment failure
Ensure
that
the chassis cover
is
secure
The
chassis
is designed to
allow cooling
air to
flow within
An
open
chassis allows
air leaks
which
may
in
turn
interrupt
and
redirect the
flow of cooling
air
across internal components
Equipment
Racks
The
following
tips
will help
you plan an acceptable
equipment rack
configuration
Enclosed racks
must have
adequate
ventilation
Ensure
that
the rack
is
not overly congested
because each unit generates heat
An
enclosed rack should
have
louvered
sides
and fan
to
provide
cooling air
When
mounting chassis
in an open rack ensure that
the rack
frame
does not block
the
intake
or the
exhaust
ports
If
the chassis
is installed
on
slides
check
the position of the chassis
when
it
is
seated
all the
way
into
the
rack
In an enclosed rack with ventilation fan
in
the
top
excessive heat generated by equipment near
the
bottom
of the rack
can
be drawn upward and
into the intake ports of the equipment above
Baffles can help
to isolate
exhaust
air
from
intake air
which
also helps
to
draw
cooling air
through
the
chassis
The
best placement of the
baffles depends upon the air
flow patterns in the
rack which can
be found by
trial-and-error
When
equipment installed in
rack
fails
particularly
in an enclosed
rack
try
operating the
equipment by
itself
if
possible
Turn off other
equipment in
the rack
and
in adjacent
racks
to
allow the unit under
test
maximum
of cooling
air
and clean
power
Power
Supply Considerations
Check
the
power at
your
site to
ensure
that you
are
receiving
clean
power free
of spikes
and
noise
Install power
conditioner
if
necessary
Install
proper grounding
to
avoid damage from
lightning
and power
surges
Preparing
for Installation 2-3