Bias-T Installation; Troubleshooting - ADC ClearGain User Manual

2.4

Bias-T Installation

2.4.1 Mechanical Attachment and Cable Connections
Caution: Prior to installing any Bias-T unit, ensure that the BTS transmitter output is turned off
and that precautions are taken to ensure that the transmitter cannot be activated during the
equipment installation.
The BIAS-T is designed to fasten directly into BTS coax-connector or directly to the feeder cable.
Integrated lightening protection is built into each Bias-T unit. There is no additional mounting
hardware required. Connect the Bias-T as follows:
1. Connect the ground cable to the Bias-T grounding pole (see
2. Connect the other end of the ground cable to the site grounding pole.
3. Connect the BIAS-T "BTS" connector directly into the BTS coax-connector.
4. Connect the coaxial run going to the MHU to the "ANT" port of the BIAS-T.
5. Connect the mini coax cable to the SMB connector of the BIAS-T unit.
6. Connect the other end of the mini coax cable to the PDU front panel SMB connector
TMA1...6 (whichever is being used).
2.4.2 Additional Lightning Protection
If operator chooses to install further lightning protection between the MHU and Bias-T, it must
allow the DC voltage to pass through the lightening protector.

3 TROUBLESHOOTING

When something is wrong with the system, the red alarm LED on the PDU is activated and the
PDU alarm output is activated. In such a case, troubleshoot for problems as follows:
1. Check that the power is fed into the PDU. PDU alarm output is activated if there is no DC
fed in it, or if DC is out of the range (20-50 VDC) or polarity is incorrect.
BTS ANT
Bias-T kit
Freq: 800 - 2200MHz
Temp: -40 to +65 C
ASSEMBLED IN
Input: 5 to 24VDC
KOREA
Max Current: 2A
Date: YYYY/MM/DD P/N: 1344027
S/N: XXXXXXXXX
DC
Figure 12. Bias-T Ground Cable Connection
ADCP-75-154 • Issue 3 • August 2006
Figure 12).
GROUND TERMINAL
21298-A
© 2006, ADC Telecommunications, Inc.
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