Drh Functions - Huawei DBS3900 IBS Hardware Description

DRH3980A&3909A&3918A&
3918B&3921A&3921B&3926A
Hardware Description
Figure 2-2 DRH dimensions

2.2 DRH Functions

This section describes the main functions of the DRH.
The Distributed Remote Head (DRH) performs the following functions:
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An DRH consists of a high-speed interface unit, signal processing unit, power amplifier, and
dual-duplexer.
Issue DraftA (2013-08-10)
Receives downlink baseband data from the DCU and sends uplink baseband data to the
DCU.
Receives RF signals from the antenna system, down-converts the signals to intermediate
frequency (IF) signals, amplifies the IF signals, and performs analog-to-digital
conversion. The transmit (TX) channel filters downlink signals, performs
digital-to-analog conversion, and up-converts RF signals to the TX band.
Multiplexes receive (RX) and TX signals on the RF channel, which enables these signals
to share the same antenna path. It also filters the RX and TX signals.
The DRH can be powered by the AC/DC power module. In this case, this DRH is called
AC DRH.
Figure 2-3 shows the logical structure of the DRH.
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