Confidential
&
Proprietary
28/117
SC
‐
DAS
No.
Unit
Description
Remark
1
MDBU
Main
Drive
BTS
Unit
Amplify
&
adjust
downlink
RF
signal
Amplify
&
adjust
uplink
RF
signal
Max
4EA
2
MCDU
Main
Com/Div
Unit
Combine
3EA
downlink
signal
and
divide
4EA
signal
to
ODU
Combine
4EA
uplink
signal
and
divide
3EA
signal
to
MDBU
Support
VHF/UHF
interface
port
3
MCPU
Main
Central
Processor
Unit
Control
and
monitoring
system
status
Control
and
monitoring
with
USB(B)
Allows
access
to
upper
‐
level
network
through
GSM
or
Ethernet
4
MPSU
Main
Power
Supply
Unit
Input
power:
DC
‐
48V,
Output
power:
9V,
6V
5
M/B
Mother
Board
Provide
signal
interface
and
power
for
each
unit
Provide
four
ports
for
dry
contact
output
Provide
three
ports
for
input
Provide
two
Aux
ports
for
future
usage
6
Shelf
19
inch,
5U
4.1.4
Sub
Assembly
Description
1)
Main
Drive
BTS
Unit
(MDBU)
MDBU
delivers
TX
signals
from
the
BTS
or
BDA
to
related
devices
as
well
as
delivers
RX
signals
from
these
devices
to
the
BTS
or
BDA.
This
unit
also
monitors
TX
input
level.
Using
the
input
AGC
function,
it
automatically
adjusts
input
ATT
according
to
input
power.
It
also
has
an
ATT
to
adjust
RX
gain.
The
MDBU
varies
per
frequency
band
to
including
the
following:
