User Manual
Table Of Contents
- SECTION 1: Overview
- SECTION 2: Description
- SECTION 3: Host Unit Installation
- SECTION 4: Operation
- SECTION 5: Maintenance
- SECTION 6: General Information
- ABOUT THIS MANUAL
- RELATED PUBLICATIONS
- ADMONISHMENTS
- GENERAL SAFETY PRECAUTIONS
- STANDARDS CERTIFICATION
- LIST OF ACRONYMS AND ABBREVIATIONS
- SECTION 1: Overview
- SECTION 2: Description
ADCP-75-126 • Issue B • April 2002 • Section 2: Description
Page 2-4
©
2002,
ADC
Telecommunications,
Inc.
most
installations,
it
is
usually
necessary
to
install
an
external
attenuator
in
the
forward
path
link
between
the
HU
and
the
BTS.
The
HU
should
be
as
close
as
possible
to
the
BTS
to
minimize
cable
losses.
2.5 RF Signal Level Adjustments
The
HU
is
equipped
with
several
attenuators
for
adjusting
the
signal
levels
of
the
forward
and
reverse
path
RF
signals.
The
attenuators
provide
an
attenuation
adjustment
range
of
0
to
30
dB
and
can
be
set
in
1
dB
increments.
The
attenuators
are
software
controlled
and
are
adjusted
through
the
NOC/NEM
interface
or
the
EMS
software
GUI.
The
host
forward
path
attenuator
adjusts
the
level
of
the
input
RF
signal
to
the
HU.
Using
the
forward
path
attenuator,
an
input
signal
with
a
nominal
composite
signal
level
of
–10
dBm
to
–40
dBm
can
be
adjusted
to
produce
maximum
power
output.
An
external
attenuator
is
required
if
the
input
signal
level
is
greater
than
–10
dBm.
The
host
reverse
path
attenuator
adjusts
the
level
of
the
output
RF
signal
and
will
add
from
0
dB
of
gain
(attenuator
set
to
30
dB)
to
30
dB
of
gain
(attenuator
set
to
0
dB)
to
the
output
signal
at
the
HU.
The
host
diversity
reverse
path
attenuator
provides
the
same
function
as
the
host
reverse
path
attenuator
but
for
the
diversity
reverse
path.
2.6 Propagation Delay
The
HU
forward,
reverse,
and
diversity
reverse
path
propagation
delays
may
be
adjusted
in
1
µs
increments
within
a
range
of
0–63
µ s.
The
propagation
delay
is
software
controlled
and
may
be
adjusted
through
the
NOC/NEM
interface
or
the
EMS
software
GUI.
2.7 Optical Connection
Optical
connections
between
the
HU
and
the
RU
(STM)
are
supported
through
either
two
(non-
diversity
unit)
or
three
(diversity
unit)
SC-type
optical
connector
ports.
On
non-diversity
units,
one
port
is
used
for
connecting
the
forward
path
optical
signal
and
the
other
port
is
used
for
connecting
the
primary
reverse
path
optical
signal.
On
diversity
units,
a
third
optical
port
is
used
for
connecting
the
diversity
reverse
path
optical
signal.
2.8 Controller Area Network Interface Connection
Controller
Area
Network
(CAN)
interface
connections
between
multiple
HUs
are
supported
by
a
pair
of
RJ-45
jacks.
One
of
the
jacks
is
designated
as
the
network
IN
port
and
the
other
jack
is
designated
as
the
network
OUT
port.
The
CAN
interface
allows
up
to
24
HUs
to
be
connected
together
(in
daisy-chain
fashion)
and
controlled
through
a
single
Digivance
EMS
computer.
2.9 Service Interface Connection
The
service
interface
connection
between
the
HU
and
the
Digivance
EMS
computer
is
supported
by
a
single
DB-9
female
connector.
The
service
connector
provides
an
RS-232
DTE
interface.
When
multiple
HUs
are
networked
together,
the
supporting
EMS
computer
may
be
connected
to
the
service
connector
of
any
one
of
the
networked
HUs.