User Manual

ADCP-75-136 Issue 1 November 2002
Page 52
©
2002,
ADC
Telecommunications,
Inc.
3.
Disconnect
the
optical
connectors
at
the
DHU
or
supporting
DEU
and
at
the
corresponding
DRU
or
remote
DEU.
4.
Inspect
the
optical
connectors.
Verify
that
each
connector
is
clean
and
that
no
scratches
or
imperfections
are
visible
on
the
fiber
end.
Clean
and
polish
the
optical
connector
if
necessary.
5.
Connect
a
laser
light
source
to
one
end
of
the
first
optical
fiber
and
an
optical
power
meter
to
the
other
end.
6.
Verify
that
the
power
loss
is
within
specifications
(8
dB
loss)
for
the
length
of
the
fiber
installed.
If
the
power
loss
is
not
within
specifications,
repair
or
replace
the
optical
fiber
and/or
connector
per
local
practice.
7.
Repeat
steps
5
and
6
for
the
second
optical
fiber.
8.
Reconnect
the
optical
connectors
at
the
DHU
or
supporting
DEU
and
the
corresponding
DRU
or
remote
DEU.
9.
At
the
DHU
or
supporting
DEU,
place
the
PORT
ON/OFF
switch
for
the
fiber
that
was
tested
in
the
ON
position
(press
I).
6.4.3 DC Power Test Procedure
The
DRU
is
powered
by
34–48
Vdc
power
which
is
supplied
through
the
RJ-45
connector.
Power
to
the
DRU
may
be
supplied
by
the
DHU,
DEU,
or
by
a
120
Vac
to
48
Vdc
power
converter
(available
separately
as
an
accessory
item)
plugged
into
a
properly
grounded
120
Vac
outlet.
Use
the
following
procedure
to
test
the
DC
power
cable:
1.
Disconnect
the
DC
power
cable
from
the
DRU.
2.
Connect
the
RJ-45
circuit
access
tool
to
the
DRU
as
shown
in
Figure
28.
POWER
PORT
POWER
CONNECTOR
RJ-45 CIRCUIT
ACCESS TOOL
17284-A
Figure 28. Connect RJ-45 Circuit Access Tool