User Manual
ADCP-75-136 • Issue 1 • November 2002
Page 43
©
2002,
ADC
Telecommunications,
Inc.
6 SYSTEM MAINTENANCE PROCEDURES
This
section
explains
the
alarm
reporting
system,
provides
a
method
for
isolating
and
troubleshooting
faults,
and
provides
procedures
for
replacing
the
modular
transceivers
and
the
DHU
or
DEU
cooling
fans.
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.
When
an
alarm
is
reported,
it
will
be
necessary
to
follow
a
systematic
troubleshooting
procedure
to
locate
the
problem.
Once
the
source
of
the
problem
is
isolated,
the
appropriate
corrective
action
can
be
taken
to
restore
service.
The
only
unit
components
that
can
be
replaced
are
the
cooling
fans
that
mount
in
the
DHU
and
DEU
and
the
modular
optical
transceivers.
The
failure
of
any
other
component
within
a
unit
will
require
replacement
of
that
unit.
6.1 Tools and Materials
The
following
tools
and
materials
are
required
in
order
to
complete
the
procedures
in
this
section:
• ESD
wrist
strap
• IR
filtering
safety
glasses
• Optical
loopback
device
(such
as
Stratos
Lightwave
LC5
series)
and
LC
duplex
adapter
• Optical
power
meter
• Magnification
device
for
inspecting
LC
connectors
• Laser
light
source
• Multimeter
• Cell
phone
• RJ-45
circuit
access
tool
(such
as
the
Harris
8-wire
Banjo
Adapter)
• Medium
and
small
size
flat-bladed
screwdrivers
• TORX
screwdriver
(T10)
6.2 Fault Detection and Alarm Reporting
Detection
of
a
fault
by
the
Digivance
ICS
will
generate
an
external
alarm
response.
LED
indicators
are
provided
on
the
front
panel
of
the
various
units
to
indicate
when
a
fault
is
detected.
In
addition
to
LED
indicators,
the
DHU
also
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.
When
the
DHU
alarm
contacts
are
connected
to
an
external
alarm
system,
detection
of
a
fault
will
generate
an
alarm
at
the
Network
Operations
Center
(NOC).
However,
various
types
of
faults
may
not
generate
an
alarm
response.
In
this
case,
the
first
indication
of
a
problem
will
probably
be
from
cell
phone
users
reporting
a
loss
of
service
or
poor
service.
Whenever
a
problem
is
reported,
whether
by
a
external
alarm
system
or
by
a
call
from
a
user,
refer
to
Subsection
6.3
to
isolate
and
correct
the
fault.