User Manual
ADCP-75-136 • Issue 1 • November 2002
Page 13
©
2002,
ADC
Telecommunications,
Inc.
2.4 Terms and Definitions
Refer
to
Table
4
for
a
listing
of
the
terms
used
in
this
manual
and
their
definition.
Table 4. Terms and Definitions
TERM DEFINITION
Alarm
Response
The
response
to
an
alarm
input.
Base
Transceiver
Station
The
radio
equipment
that
transmits
and
receives
the
voice
and
control
channels
to
and
from
the
cellular
handsets.
Composite
Signal
A
signal
that
is
the
sum
of
several
signals.
Digital
Expansion
Unit
The
unit
that
extends
a
single
optical
interface
to
multiple
optical
interfaces
or
that
extends
an
optical
run.
Digital
Host
Unit
The
unit
that
converts
and
provides
the
digital
source
signal
to
all
DEU’s
and
DRU’s
and
converts
summed
inputs
from
DEU’s
and
DRU’s.
Digital
Remote
Unit
The
unit
that
interfaces
the
in-building
user
to
the
Digivance
optical
transport.
Digitized
RF
Signal
The
RF
signal
in
a
digitized
form.
Forward
Path
Signal
A
signal
that
travels
from
the
base
station
to
the
cell
phone.
Major
Alarm
An
alarm
condition
that
applies
when
any
fault
(except
high
temperature)
occurs.
Minor
Alarm
The
alarm
condition
that
applies
when
a
high
temperature
condition
occurs.
(>
50º
C/122º
F)
Mute
To
force
a
forward
path
RF
signal
to
a
“no
signal”
state.
Normal
State
The
operating
state
after
power-up
is
completed
and
no
faults
are
detected.
Port
An
RF,
optical,
or
electrical
interface
point.
Port
Alarm
A
fault
that
affects
only
the
unit
or
units
connected
to
that
port.
Indicates
no
optical
input
to
port.
Power-Up
State
The
period
between
the
application
of
power
to
a
unit
and
the
normal
state.
This
period
includes
time
for
circuit
stabilization
and
initialization
operations.
Reverse
Path
Signal
A
signal
that
travels
from
one
or
more
cell
phones
to
the
base
station.
Transport
Alarm
Signal
An
alarm
signal
transported
over
the
reverse
path
optical
fiber.
Unit
Alarm
A
fault
within
a
unit
that
usually
affects
all
connected
ports.
2.5 Specifications
Refer
to
Table
5
for
the
Digivance
ICS
system
specifications.
All
specifications
apply
after
a
five
minute
warm-up
period.