8
/
0
7
•
1
0
5
1
8
7
A
E
C
le
ar
G
ai
n
®
T
o
w
er
-M
o
u
n
te
d
A
m
p
lif
ie
rs
2
w w w . a d c . c o m
•
+ 1 - 9 5 2 - 9 3 8 - 8 0 8 0
•
1 - 8 0 0 - 3 6 6 - 3 8 9 1
ClearGain
®
Tower-Mounted Amplifiers
Americas
Introduction
Unacceptable network quality is one of the main
reasons for mobile subscriber churn. With industry
churn at their current rates, a service provider’s
entire customer base could be lost in as few as
three years. The cost of acquiring new subscribers
to replace the existing customer base can be
enormous. Improvements in quality of service can
directly impact a service provider’s profitability
through the cost savings associated with
increased subscriber retention and the additional
revenue gained from increased billable minutes
of use resulting from improved signal quality.
While subscribers are willing to pay a premium
for data services, improved quality of service is
necessary to provide new data services. Due to
the tradeoff between bit rate and bandwidth
inherent to data services, improved signal
quality is required to achieve the same level of
performance at even higher data rates. ADC’s
ClearGain Tower-Mounted Amplifiers help provide
this improvement in signal quality.
TMAs improve signal quality by boosting the
uplink (RX) signal of a mobile system immediately
after the antenna. This compensates for the loss
in signal strength that occurs when the signal
is passed through the coaxial feeder cable to
the base transceiver station (BTS) at the base
of the tower. ClearGain TMAs perform this
amplification with the lowest possible noise
contribution, resulting in a substantial increase
in receiver performance and an improvement in
overall coverage. These improvements in quality
of service allow mobile
subscribers to place more
calls, make longer calls,
and successfully complete
calls in an expanded
geographic area, resulting
in increased revenue.
System Overview
The ClearGain TMA system is modular, consisting
of a Masthead Unit (MHU), a Power Distribution
Unit (PDU) and a Bias-T Unit. This system provides
full compatibility with all base stations. The
ClearGain MHU offers dual duplex operation and
incorporates a highly advanced fixed-gain, low-
noise amplifier (LNA) and high-performance filters
for added reliability. The MHU amplifies each band
to maximize signal quality and optimize coverage.
The ClearGain MHU features a slim, lightweight
design. This allows two ClearGain TMAs to
be mounted with one set of brackets thereby,
conserving valuable and costly tower space
and reducing clutter on the tower. The TMA
is protected with a strong, aluminum sleeve
construction designed to ensure superior weather
protection and resistance to corrosion, resulting in
increased reliability.
In the ClearGain TMA system, DC power is
supplied to the MHU from a ClearGain PDU. The
PDU also provides alarming and monitoring of the
feeder cable and up to six MHUs from a single
unit. The flexible design of the ClearGain PDU
allows it to be rack- or wall-mounted on the side
of a BTS cabinet.
An external Bias-T Unit is used in conjunction
with the ClearGain PDU. The Bias-T inserts DC
power onto the coaxial cable and extracts alarm
and monitoring signals from the coaxial cable.
+ -
INpUt
NO cOM Nc
ALARM
MhU
DIScONNect
power Distribution Unit
MhU1
MhU2
MhU3
MhU4
MhU5
MhU6
Base
Station
clearGain™
tMA
ANt
BtS
Bias-t
BtS
Antenna
BtS
