User Manual
ADCP-75-110 • Issue 2B • July 2001
Page 33
©
2001,
ADC
Telecommunications,
Inc.
3.7 Coaxial Cable Connections
The
RF
interface
between
DHU
and
the
BTS
is
supported
through
a
pair
of
type
N
female
connectors
mounted
on
the
DHU
front
panel.
One
connector
provides
the
coaxial
cable
connection
for
the
forward
path
(downlink)
signal.
The
other
connector
provides
the
coaxial
cable
connection
for
the
reverse
path
(uplink)
signal.
Coaxial
cables
link
the
DHU
to
the
BTS
through
an
interface
device
such
as
the
LIU
or
the
RIU.
Use
the
following
procedure
to
install
the
forward
and
reverse
path
coaxial
cables
and
connect
them
to
the
DHU:
1.
Obtain
the
required
lengths
of
high
performance,
flexible,
low
loss
50-ohm
coaxial
communications
cable
(RG
400
or
equivalent)
for
all
coaxial
connections.
2.
Route
the
forward
path
and
reverse
path
coaxial
cables
(if
not
already
routed)
between
the
DHU
and
the
specified
BTS
interface
device
(per
system
design)
and
cut
to
the
required
length.
Allow
sufficient
slack
for
dressing
and
organizing
cables
at
the
DHU.
3.
Terminate
each
cable
with
a
type
N
male
connector
following
the
connector
supplier’s
recommendations.
4.
Connect
the
forward
path
cable
to
the
RF
IN
connector
on
the
DHU
front
panel
as
shown
in
Figure
19.
5.
Connect
the
reverse
path
cable
to
the
RF
OUT
connector
on
the
DHU
front
panel
as
shown
in
Figure
19.
16428-A
TYPE-N MALE CONNECTOR
RF IN CONNECTOR
(FORWARD PATH)
RF OUT CONNECTOR
(REVERSE PATH)
Figure 19. Forward and Reverse Path Coaxial Cable Connections
6.
Dress
and
secure
cables
at
the
DHU
per
standard
industry
practice.
7.
Connect
the
forward
and
reverse
path
cables
to
the
LIU
(microcell)
or
the
RIU
(donor
antenna)
as
specified
in
the
instructions
provided
with
that
unit.
8.
Complete
all
remaining
coaxial
cable
connections
between
the
LIU
and
the
BTS
or
between
the
RIU
and
the
donor
antenna
as
specified
in
the
instructions
provided
with
the
interface
unit.