User Manual
ADCP-75-110 • Issue B • March 2001
Page 22
©
2001,
ADC
Telecommunications,
Inc.
2.8 Local Alarm System Reporting Requirements
The
DHU
provides
normally
open
(NO)
and
normally
closed
(NC)
dry
alarm
contacts
for
reporting
minor
and
major
alarms
to
an
external
alarm
system.
A
minor
alarm
is
defined
as
a
high
temperature
condition.
A
major
alarm
is
defined
as
any
fault
condition
except
high
temperature.
Connections
to
the
alarm
contacts
are
provided
through
a
screw-type
terminal
strip.
Use
#26
AWG
insulated
solid
copper
wire
for
the
alarm
wires.
If
an
external
alarm
system
is
not
in
use,
no
alarm
connections
are
required.
2.9 Maintenance Requirements
The
Digivance
ICS
requires
no
regular
maintenance
to
insure
continuous
and
satisfactory
operation.
Maintenance,
as
it
applies
to
the
Digivance
ICS,
primarily
involves
diagnosing
and
correcting
service
problems
as
they
occur.
Faults
and
failures
arising
from
within
the
Digivannce
ICS
will
generate
an
external
alarm
response
which
includes
lighting
an
LED
indicator(s)
and
closing
or
opening
a
set
of
alarm
contacts.
When
an
alarm
is
reported,
it
will
be
necessary
to
isolate
the
source
of
the
problem
by
observing
the
LED
indicators
on
each
unit
and
then
performing
specified
tests
to
isolate
the
problem.
Once
the
source
of
the
fault
is
isolated,
the
appropriate
action
can
be
taken
to
correct
the
problem.
The
only
unit
components
that
can
be
replaced
are
the
cooling
fans
which
mount
in
the
DHU
and
the
DEU.
The
failure
of
any
other
component
within
a
unit
will
require
replacement
of
the
unit.
Basic
troubleshooting
procedures
are
provided
in
section
5
of
this
manual.
2.10 System Design Recommendations
Follow
a
systematic
process
when
designing
an
in-building
coverage
solution.
The
following
sub
sections
outline
the
four
phases
of
the
in-building
coverage
solution
design
process.
System
design
and
planning
services
are
available
from
ADC
if
required.
Refer
to
section
6
of
this
manual
for
additional
information.
2.10.1 Phase One - Initial Evaluation
Qualify
the
Installation:
Confirm
that
there
are
no
extenuating
circumstances
that
would
prevent
a
successful
installation
such
as:
extreme
cellular
system
issues
(blocking,
severe
interference,
site
problems,
etc.),
building
issues,
power
issues,
or
safety
issues
(site
should
not
present
any
hazards
or
conditions
that
would
make
operation
of
the
equipment
unsafe).
Analyze
the
RF
Situation:
Determine
how
the
system
RF
link
to
the
outside
world
will
be
provided.
Will
it
be
a
direct
feed
from
a
BTS
(microcell)
or
an
over-the-air
connection
via
a
donor
antenna?
If
it
is
a
donor
antenna,
is
the
customer
within
the
coverage
footprint
of
a
serving
cell
or
better?
The
coverage
can
be
determined
during
the
preliminary
walkthrough
by
checking
the
downlink
Received
Signal
Strength
Indication
(RSSI)
outside
the
building
with
a
unity
gain
sampling
antenna.
Sometimes
a
rooftop
reading
is
needed
to
obtain
a
sufficient
signal
level.
Note
that
it
is
an
FCC
violation
to
expand
the
normal
coverage
footprint
of
a
cellular
site
with
an
in-building
product.
In
addition,
consider
the
impact
the
system
will
have
on
traffic,
especially
the
busy
hour.
Confirm
with
the
service
provider
that
the
expected
increase
in
the
volume
of
calls
will
be
addressed
(if
needed),
possibly
with
additional
equipment
such
as
additional
channels
or
a
microcell.