User Manual
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 5: Maintenance
Page 5-12
©
2003,
ADC
Telecommunications,
Inc.
18. Repeat
steps
3
through
17
for
each
optical
fiber
that
requires
testing.
19. When
ready
to
put
the
system
back
into
service,
place
the
On/Off
switch
in
the
ON
position
(press
I)
at
both
the
HU
and
STM.
20. Notify
the
NOC
or
alarm
monitoring
service
that
the
system
is
going
back
online.
4.2 Optical Loopback Test
The
following
procedures
provide
tests
to
determine
if
an
optical
port
fault
exists
with
the
Host
Unit
or
with
the
STM.
4.2.1 Host Loopback Test
1. Put
on
the
IR
filtering
safety
glasses.
2. Notify
the
NOC
or
alarm
monitoring
system
operator
that
the
system
is
going
offline.
3. At
the
HU,
place
the
On/Off
switch
in
the
OFF
position
(press
O).
4. Disconnect
the
optical
fiber
connectors
from
the
PORT
1
and
PORT
2
optical
ports
and
place
a
dust
cap
over
each
connector.
5. Plug
a
15
dB
in-line
optical
attenuator
into
the
PORT
1
optical
port.
6. Connect
a
patch
cord
between
the
optical
attenuator
and
the
PORT
2
optical
port.
7. Place
the
On/Off
switch
in
the
ON
position
(press
I)
and
observe
the
PORT
1/PORT
2
LED
indicator.
8. The
PORT
1/PORT
2
LED
indicator
will
turn
either
red
or
green.
If
the
LED
turns
red,
either
the
PORT
1
optical
transmitter
or
the
PORT
2
receiver
is
faulty.
If
the
LED
turns
green,
both
PORT
1
and
PORT
2
optical
ports
are
good.
9. Place
the
On/Off
switch
in
the
OFF
position
(press
O).
10. Remove
the
dust
caps
from
the
optical
fiber
connectors.
11. Clean
each
connector
(follow
connector
supplier’s
recommendations)
and
then
insert
each
connector
into
the
appropriate
optical
port.
12. When
ready
to
put
the
unit
back
into
service,
place
the
On/Off
switch
in
the
ON
position
(press
I).
13. Notify
the
NOC
or
alarm
monitoring
service
that
the
system
is
going
back
online.
Danger:
This
equipment
uses
a
Class
1
Laser
according
to
FDA/CDRH
rules.
Laser
radiation
can
seriously
damage
the
retina
of
the
eye.
Do
not
look
into
the
ends
of
any
optical
fiber.
Do
not
look
directly
into
the
optical
transmitter
of
any
unit
or
exposure
to
laser
radiation
may
result.
An
optical
power
meter
should
be
used
to
verify
active
fibers.
A
protective
cap
or
hood
MUST
be
immediately
placed
over
any
radiating
transmitter
or
optical
fiber
connector
to
avoid
the
potential
of
dangerous
amounts
of
radiation
exposure.
This
practice
also
prevents
dirt
particles
from
entering
the
connector.