User Manual
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 1: Overview
Page 1-4
©
2003,
ADC
Telecommunications,
Inc.
Figure 1-3. BTS/HU Interface With Conditioning Panel and Duplexing Panel
2.3 Handset Interface
The
RU
interfaces
with
the
handsets
(cell
phones)
through
an
antenna.
In
the
reverse
path,
the
RU
receives
RF
signals
from
each
handset.
The
RU
digitizes
the
RF
signals
and
then
converts
them
to
digital
optical
signals
for
transport
to
the
HU
over
the
fiber
optic
link.
In
the
forward
path,
the
RU
receives
digital
optical
signals
from
the
HU.
The
RU
converts
the
optical
signals
to
RF
signals
for
transmission
to
the
handsets.
The
RU
is
connected
to
an
antenna
(not
provided)
which
transmits
and
receives
the
handset
RF
signals.
2.4 Local Service Interface
Local
communications
with
an
individual
Digivance
system
is
supported
through
a
local
service
interface
capability
as
shown
in
Figure
4.
The
primary
component
of
the
local
interface
is
a
PC-
type
laptop
computer
loaded
with
the
Digivance
Element
Management
System
(DEMS)
software.
DEMS
provides
the
various
control
and
monitoring
functions
required
for
local
management
of
each
Digivance
system.
The
DEMS
computer
can
be
directly
connected
to
either
the
HU
or
RU
through
the
computer’s
RS-232
port.
Operation
is
effected
through
the
DEMS
Graphical
User
Interface
(GUI).
The
GUI
consists
of
a
series
of
screens
from
which
the
user
selects
the
desired
option
or
function.
An
RS-232
service
port
is
provided
on
both
the
HU
and
the
RU
for
connecting
the
DEMS
computer.
18515-A
RF
RF
RF
RF
RF
BASE
TRANSCEIVER
STATION
COAXIAL
CABLES
COAXIAL
CABLES
HOST UNIT
HOST UNIT
HOST UNIT
CONDITIONING
PANEL
DUPLEXING
PANEL