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Site
Requirements
Plant
Wiring
Following
are guidelines
for
setting
up
the plant wiring
and
cabling
at
your
site
When
planning
the
location
of the
new
system
consider
the distance
limitations
for
signaling
electromagnetic
interference
and
connector
compatibility
as
described
in
the following
sections
Interference
Considerations
When
wires
are run for
any
significant
distance
in an electromagnetic
field
interference
can
occur
between
the
field
and
the signals
on
the
wires
This
fact
has
two
implications
for the construction
of
plant
wiring
Bad
wiring
practice
can
result
in radio
interference
emanating
from
the plant
wiring
Strong
electromagnetic
interference
especially
as
caused
by
lightning
or radio
transmitters
can
destroy
the signal drivers
and
receivers
in the router
and
can
even
create
an
electrical
hazard
by
conducting
power
surges
through
lines
and
into
equipment
Review
the safety warnings
in
the
section
Safety
with
Electricity
in
this
chapter
Note
To
predict
and remedy
strong
electromagnetic
interference
EMI
you
may
also
need
to
consult
experts
in
radio
frequency
interference
RFI
If
you
use
twisted-pair cable
in
your
plant
wiring
with
good
distribution
of grounding
conductors
the plant wiring
is
unlikely
to
emit
radio interference
When
exceeding
the
recommended
distances
use
high-quality
twisted-pair cable
with
one ground
conductor
for
each
data
signal
when
applicable
If
wires
exceed recommended
distances
or
if
wires
pass
between
buildings
give
special
consideration
to
the
effect
of
lightning
strike
in
your
vicinity
The
electromagnetic
pulse
EMP
caused
by
lightning
or other
high-energy
phenomena
can
easily
couple
enough
energy
into
unshielded
conductors
to
destroy
electronic
devices
If
you have
had problems
of
this sort
in the
past
you
may
want
to
consult
experts
in
electrical
surge
suppression
and
shielding
Most
data
centers cannot
resolve
the infrequent
but potentially catastrophic
problems
just
described
without
pulse
meters
and
other
special
equipment
These
problems can
cost
great
deal of time
to
identify
and
resolve
so take
precautions
by
providing
properly
grounded
and
shielded
environment
with
special
attention
to
issues of
electrical
surge
suppression
The
ground
screw
on
the
left
side
of the
interface
processor
end
of the chassis provides
connection
point
for
connecting
ground
wire
or
antistatic
device
to
chassis
ground
See
Figure
1-3
Distance
Limitations
and
Interface
Specifications
The
length
of
your
networks
and
the distances
between
connections
depend
on
the type of signal
the signal
speed
and
the transmission
media the
type
of cabling
used
to
transmit
the signals
For
example
standard
coaxial
cable
has
greater
channel
capacity
than
twisted-pair
cabling
The
distance
and
rate
limits
in these
descriptions
are
the
IEEE
recommended
maximum
speeds
and
distances
for signaling
however
you
can
usually
get
good
results
at
speeds
and
distances
far
greater
than
these
For example
the
recommended
maximum
rate
for V.35
is
Mbps
but
it
is
commonly
used
at
4Mbps
without
any problems
If
you
understand
the
electrical
problems
that
might
arise
and
can
compensate
for
them
you
should
get
good
results
with
rates
and
distances
greater
than
those
shown
here however
do
so
at
your
own
risk
Preparing
for
Installation
2-5
Summary of Contents for 7513 Series
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Page 11: ...Cisco 7513 Hardware Installation and Maintenance ...
Page 121: ...Site Log 2 56 Cisco 7513 Hardware Installation and Maintenance ...
Page 162: ...Troubleshooting the Processor Subsystem 4 10 Cisco 7513 Hardware Installation and Maintenance ...
Page 266: ...Interface Processor LEDs B 16 Cisco 7513 Hardware Installation and Maintenance ...
Page 270: ...C 4 Cisco 7513 Hardware Installation and Maintenance ...
Page 288: ...18 Cisco 7513 Hardware Installation and Maintenance ...