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 1: Overview
Page 1-6
©
2002,
ADC
Telecommunications,
Inc.
Because
separate
forward
and
reverse
path
optical
inputs
and
outputs
are
provided
at
the
HU
and
RU,
a
Free
Space
Optics
(FSO)
system
(that
meets
the
Digivance
LRCS
data
rate
performance
and
BER
requirements)
may
be
used
in
applications
where
it
is
desirable
to
bridge
an
open
span
and
where
it
is
impractical
to
lay
a
fiber
optic
cable.
One
FSO
transceiver
unit
may
be
mounted
on
the
HU
side
of
the
open
span
and
the
other
FSO
transceiver
unit
may
be
mounted
on
the
RU
side
of
the
open
span.
A
system
diagram
of
an
FSO
application
is
shown
in
Figure 1-5.
FSO
systems
are
available
from
various
equipment
manufacturers.
Figure 1-5. Free Space Optics Application
3.2 Control and Monitoring Software
The
Digivance
EMS
software
supports
system
control
and
monitoring
functions
for
both
the
local
and
remote
service
interfaces.
The
EMS
software
is
stored
on
a
CD-ROM
and
shipped
separately
with
each
HU.
Software
installation
consists
of
copying
the
software
files
from
the
CD-ROM
to
a
designated
directory
on
the
hard-drive
of
the
EMS
computer.
The
EMS
software
may
also
be
copied
to
the
hard-drive
of
a
laptop
computer
when
a
local
service
interface
connection
with
a
specific
HU
or
RU
is
required.
The
EMS
software
is
used
to
provision
and
configure
the
system
for
operation.
This
includes
selecting
a
sitename,
setting
alarm
thresholds,
and
setting
forward
and
reverse
path
RF
gain
adjustments.
The
EMS
software
is
also
used
to
get
alarm
messages
(individual
or
summary),
data
measurements,
or
to
upgrade
the
HU/RU
system
software.
All
control
and
monitor
functions
(except
software
upgrade
which
can
only
be
done
using
the
EMS
software
GUI)
can
be
effected
using
either
the
NOC/NEM
interface
or
the
EMS
software
GUI.
3.3 Fault Detection and Alarm Reporting
LED
indicators
are
provided
on
the
front
panel
of
the
HU
and
on
the
front
panels
of
the
RU
modules
to
indicate
if
the
system
is
normal
or
if
a
fault
is
detected.
In
addition,
normally
open
and
normally
closed
alarm
contacts
(for
both
major
and
minor
alarms)
are
provided
at
the
HU
for
connection
to
a
customer-provided
external
alarm
system.
All
alarms
can
also
be
accessed
through
the
NOC/NEM
interface
or
the
EMS
software
GUI.
EBTS
HOST UNIT
REMOTE UNIT
16999-A
COAX
FSO
TX/RX
FSO
TX/RX
PRIMARY
REVERSE PATH
FORWARD
PATH
FORWARD
PATH
PRIMARY
REVERSE PATH
FREE SPACE OPTICS LINK