EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
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8.4.2
Connecting the BIU with BDA
Because the BIU runs in simplex mode, when connecting to a BDA, you need to separate the BDA
downlink (Tx) and uplink (Rx) signals using a duplexer.
1- Use a spectrum analyzer or power meter to check signals sent from the BTS Tx. If the signals exceed
the input range (-20dBm~+10dBm) accepted by the BIU, you can connect an attenuator between the
BDA and BIU to bring the signal level into range.
2- Connect a duplexer to separate the downlink and uplink signals.
3- Connect the BDA to the BIU using the RF cabling. The figure below shows an example of connecting
two BDA’s to the MDBU supporting the 800PS band. It is not necessary to terminate unused ports on the
BIU backplane.
Figure 8
.
7 – BDA Interface to the BIU Backplane Using a Duplexer
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