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&
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SC
‐
DAS
Figure
4.5
–
MCDU
at
a
glance
VHF+UHF
frequency
band
includes
the
following:
for
use
in
future
No
Unit
naming
Description
In/out
RF
Port
TX
RX
1
VHF+UHF
Dual
Band
1
Port
1
Port
3)
Main
Central
Processor
Unit
(MCPU)
MCPU
can
inquire
and
control
the
state
of
the
modules
that
are
installed
in
the
BIU.
This
unit
can
inquire
and
control
the
state
of
up
to
four
ODUs.
Through
communication,
it
also
can
inquire
and
control
ROUs
that
are
connected.
In
addition,
the
unit
has
USB(B)
port
for
local
monitoring
so
that
it
can
inquire
and
control
state
of
devices
through
a
PC.
On
the
front
panel,
it
has
communication
LED
indicators
to
check
communication
state
with
ROU.
It
also
has
ALM
LED
indicators
to
show
whether
a
device
is
faulty.
For
access
to
upper
network,
it
has
a
port
to
insert
an
Ethernet
port
and
GSM
modem
in
it.