EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
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BTS Interface Unit (BIU)
As the central input unit (or headend) for all signals, the BIU independently filters, attenuates and controls
each signal sent and received over the DAS. It also provides the connection point for the DMS-600
management system that allows control and command of the system.
The BIU provides forward path (downlink or Tx) signals from the base station (BTS) or bi-directional
amplifier (BDA) to the system’s ODUs (Optic Distribution Units). The BIU unit also separates reverse path
(uplink or Rx) signals per individual frequency bands received from the ODUs. Each signal is
independently filtered, attenuated, and controlled in the BIU.
The BIU offers a modular architecture allowing you to add service bands via hot swappable slide-in
modules (Main Drive BTS Unit or MDBUs). The BIU supports quad band SISO and quad band MIMO in a
single unit.
The following block diagram shows the BIU’s primary components, functions,
inputs and outputs.
Figure 3.1 – BIU Block Diagram
Содержание EXPRESS Single-Carrier DAS
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