User's Manual
PMP320HDW2v1
3-25
Preliminary
JUL
2010
Grounding
Infrastructure
Equipment
Chapter
3:
CMM4
Hardware
Installation
Grounding
Infrastructure
Equipment
T
o
protect
both
your
staff
and
your
infrastructure
equipment,
implement
lightning
protection
as
follows:
•
Observe
all
local
and
national
codes
that
apply
to
grounding
for
lightning
protection.
•
Before
you
install
your
modules,
perform
the
following
steps:
Engage
a
grounding
professional
if
you
have
any
questions
on
grounding.
Install
lightning
arrestors
to
transport
lightning
strikes
away
from
equipment.
F
or
example,
install
a
lightning
rod
on
a
tower
leg
other
than
the
leg
to
which
you
mount
your
module.
Connect
your
lightning
rod
to
ground.
Plan
to
use
an
appropriate
surge
suppressor
on
any
Ethernet
cable
at
the
point
where
it
enters
any
building
or
structure.
•
Install
your
modules
at
least
2
feet
(0.6
meters)
below
the
tallest
point
on
the
tower
,
pole,
or
roof
.
Conforming
to
Regulations
F
or
all
electrical
purposes,
ensure
that
your
network
conforms
to
applicable
country
and
local
codes,
such
as
the
NEC
(National
Electrical
Code)
in
the
U
.S
.A.
If
you
are
uncertain
of
code
requirements,
engage
the
services
of
a
licensed
electrician.
In
particular
,
many
codes
require
that
wired
electrical
devices
like
the
56
VDC
power
supply
either
terminate
in
a
plug
connection
or
be
wired
with
an
on/off
switch,
and
not
be
hard
-
wired
to
AC/mains.
Protecting
Cables
and
Connections
Cables
that
move
in
the
wind
can
be
damaged,
impart
vibrations
to
the
connected
device,
or
both.
A
t
installation
time,
prevent
these
problems
by
securing
all
cables
with
cable
ties,
cleats,
or
weather
-
resistant
tape.
The
cable
can
be
a
path
for
water
to
follow
to
enter
the
cable
connector
or
even
the
module.
Y
ou
can
prevent
this
problem
by
including
and
securing
a
drip
loop
where
the
cable
enters
the
module
enclosure.
Testing
the
Components
The
best
practice
is
to
connect
all
the
components
-
BHs,
AP
s,
GPS
antenna,
and
CMM4
-
in
a
test
setting
and
initially
configure
and
verify
them
before
deploying
them
to
an
installation.
However,
circumstances
or
local
practice
may
require
a
different
practice.