User Manual
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 2: Description
Page 2-16
©
2003,
ADC
Telecommunications,
Inc.
Figure 2-7. Spectrum Transport Module
5.2 Mounting
The
STM
mounts
within
the
RU
outdoor
cabinet
or
indoor
mounting
shelf.
A
runner
on
the
bottom
of
the
STM
meshes
with
a
track
inside
the
cabinet/mounting
shelf.
The
runner
and
track
guide
the
STM
into
the
installed
position.
The
electrical
interface
between
the
STM
and
LPA
is
supported
by
a
D-sub
female
connector
located
on
the
rear
side
of
the
STM.
A
corresponding
D-
sub
male
connector
mounted
at
the
rear
of
the
RU
cabinet/mounting
shelf
mates
with
the
STM
connector.
Captive
screws
are
provided
for
securing
the
STM
in
the
installed
position.
5.3 Fault Detection and Alarm Reporting
The
STM
detects
and
reports
various
faults
including
remote
unit
fault,
optical
fault,
power
fault,
temperature
fault,
power
amplifier
fault,
and
external
(door
open)
fault.
Various
front
panel
Light
Emitting
Diode
(LED)
indicators
turn
from
green
to
red
or
yellow
if
a
fault
is
detected.
The
status
of
the
STM,
the
alarm
state
(major
or
minor),
and
other
alarm
information
is
summarized
and
reported
over
the
optical
fiber
to
the
HU
and
also
over
the
service
interface.
In
addition,
the
alarm
state
of
the
HU
is
received
over
the
optical
fiber
and
reported
to
the
service
interface.
This
information
may
be
accessed
remotely
through
the
NOC/NEM
interface
or
locally
through
the
DEMS
software
GUI.
5.4 Antenna Cable Connection
The
antenna
cable
connections
between
the
STM
and
the
antenna
are
supported
through
one
N-
type
female
connector
which
carries
both
the
forward
and
reverse
path
RF
signals.
When
installed
in
the
RU
outdoor
cabinet,
the
STM
does
not
connect
directly
to
the
antenna
but
18634-A