User's Manual
ADCP-75-110 • Issue 2B • July 2001
Page 19
©
2001,
ADC
Telecommunications,
Inc.
2.3 Powering Requirements
2.3.1 DHU and DEU Powering
The
DHU
and
DEU
are
powered
by
120–240
Vac
(50–60
Hz)
which
is
supplied
through
a
standard
three-conductor
AC
power
cord.
The
120
Vac
power
cord
is
provided
with
the
unit
and
is
98
inches
(2.5
m)
long.
Both
the
DHU
and
the
DEU
have
a
current
rating
of
2.0
Amps
at
120
Vac
input.
Locate
each
unit
so
that
an
AC
outlet
is
within
the
reach
of
the
power
cord.
If
back-up
powering
is
required,
it
is
recommended
that
the
building
Uninterruptible
Power
Supply
(UPS)
system
be
used
to
provide
back-up
power
to
the
DHU
and
DEU
in
the
event
of
an
AC
power
outage.
2.3.2 DRU Powering
The
DRU
is
powered
by
48
Vdc
power
which
is
supplied
to
the
DRU
through
the
front
panel
RJ-45
connector.
Power
to
the
DRU
may
be
provided
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.
The
DRU
has
a
current
rating
of
350
mA
at
48
Vdc
input.
If
the
DRU
will
be
powered
by
the
DHU
or
DEU,
the
power
cable
must
be
fabricated
on-site
by
the
installer.
Use
category
3
or
5
twisted
pair
cable
as
the
power
supply
cable
when
the
DRU
is
powered
by
the
DHU
or
DEU.
The
maximum
recommended
length
of
the
power
cable
is
500
meters.
If
the
DRU
will
be
located
more
than
500
meters
from
the
DHU
or
DRU,
the
DRU
must
be
locally
powered
by
a
48
Vdc
power
converter.
Route
the
power
cable
between
the
power
source
and
the
DRU.
Terminate
both
ends
of
the
power
cable
with
a
male
RJ-45
connector.
The
DRU
may
be
powered
locally
by
the
ac/dc
converter,
shown
in
Figure
10,
which
is
available
as
an
accessory
item.
The
converter
is
a
UL
Listed
stand
alone
Limited
Power
Supply
(LPS)
unit
with
a
rated
output
of
48
Vdc
at
1.2
Amps.
The
converter
is
equipped
with
a
6-foot
(1.8
m)
DC
power
cable
which
is
terminated
with
an
RJ-45
male
connector.
The
converter
is
powered
by
120–240
Vac
(50–60
Hz)
power
which
is
supplied
though
a
standard
three-conductor
AC
power
cord.
The
120
Vac
power
cord
is
6
feet
(1.8
m)
long
and
is
provided
with
the
converter.
15988-A
Figure 10. AC/DC Power Converter