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ADCP-75-214 • Issue 2 • September 2006
Page 1
© 2006, ADC Telecommunications, Inc.
1 PRODUCT OVERVIEW
1.1 General Description
The ClearGain 1800 or 2100 MHz Dual Inline Tower Mounted Amplifier (TMA) system are
composed of some combination of three functional components: a ClearGain Power Distribution
Unit (PDU), a Masthead Unit (MHU) / Tower Mounted Amplifier (TMA), and a Bias-T.
Figure 1
shows where these components are located in a typical application on a communications tower.
Figure 1. Functional Components of a ClearGain TMA System
One PDU may support up to three dual inline MHUs of the same frequency. Each MHU requires
a separate Bias-T. The ClearGain TMA system also includes power cables and alarm cables.
MA
S
THEAD UNIT (MHU)
BASE
TRANSCEIVER
STATION
21297-B
ClearGain PDU
DUAL
INLINE
BTS ANT
DC
Bias-T kit
Freq: 800 - 2200MHz
Temp: -40 to +65 C
Input: 5 to 24VDC
Max Current: 2A
P/N: 1344027
S/N: XXXXXXXXX
Date: YYYY/MM/DD
ASSEMBLED IN
KOREA
BIAS-T
RS485
A
BG
INPUT
- +
ALARM
NO COM NC FAIL
MHU 1 MHU 2 MHU 3
OK OK OK
G
W
B
R
CONNECT
MHU
ClearGain