User Manual
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 5: Maintenance
Page 5-13
©
2003,
ADC
Telecommunications,
Inc.
4.2.2 STM 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
STM,
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/PORT2
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
receiver
is
faulty
or
the
PORT
2
transmitter
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.
5 MAINTENANCE PROCEDURES
This
section
specifies
the
system
maintenance
requirements
and
provides
the
procedures
for
the
required
maintenance
tasks.
Refer
to
these
procedures
as
needed
when
specified
in
the
Scheduled
Maintenance
table.
5.1 Scheduled Maintenance
Table 5-10
lists
the
items
that
require
regular
maintenance
and
the
recommended
maintenance
interval.
Refer
to
the
section
specified
in
the
table
for
the
required
maintenance
or
test
procedure.