2.1 RRU Equipment
The RRU is a remote radio unit.
The RRU has the following functions:
l The RRU receives RF signals from the antenna system, down-converts the signals to IF
signals, and then transmits them to the BBU or the macro NodeB after amplification,
analog-to-digital conversion, digital down-conversion, matched filtering, and Digital
Automatic Gain Control (DAGC).
l The RRU receives downlink baseband signals from the BBU or the macro NodeB, forwards
data from its cascaded RRU, performs filtering and digital-to-analog conversion, and up-
converts RF signals to the transmitting frequency band.
l The RRU multiplexes RX and TX signals over RF channels and filters the RX signals and
TX signals. This enables the RX signals and TX signals to share the same antenna path.
2.1.1 Appearance of the RRU
The RRU features a modular structure with its ports at the module bottom and on the cabling
cavity.
2.1.2 LEDs on the RRU
The LEDs, on the LED panel of the RRU, indicate the running status of the RRU.
2.1.3 Panels of the RRU
The RRU has a bottom panel, a cabling cavity panel, and an LED panel.
2.1.1 Appearance of the RRU
The RRU features a modular structure with its ports at the module bottom and on the cabling
cavity.
Figure 2-1 shows the RRU. On the left is a front view of the RRU without the housing, in the
middle is a side view of the RRU without the housing, and on the right is a front view of the
RRU housing.
Figure 2-1 RRU
2 RRU and SRXU Hardware
RRU
User Guide
2-2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 01 (2008-04-18)
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