No. Module Optional or
Mandatory
Maximum
Quantity
Remark
2 RFU Mandatory 12 The RFU modulates and
demodulates baseband
signals and RF signals,
processes data, and
combines and divides
signals.
3 Fan Assembly Mandatory 2 Fan assembly dissipates the
heat from the cabinet.
4 Air intake vent Mandatory - -
5 DCDU-11A Mandatory 2 -
6 BBU Mandatory 1 BBU3900 processes the
baseband signals and enables
interaction between the base
station and the BSC or RNC.
7 Cable trough Mandatory - -
8 BBU Optional 1 This 2 U space can house a
BBU in triple-mode base
stations. It is recommended
that this space be reserved
even when only one BBU is
installed.
9 Remaining space Optional - This 2 U space can house the
GATM or transmission
equipment. The GATM is
preferentially installed in this
space and is supplied with
power by the DCDU-01. If
there is no GATM, the
transmission equipment is
installed in this space.
NOTE
The transmission equipment is preferentially installed outside the cabinet. However it can be installed at
the bottom of the cabinet under some special condition (e.g.: space constraint). The following requirements
must be satisfied:
l The transmission equipment must be able to work properly at a temperature equal to or higher than
55°C.
l The transmission equipment is fed with external power supply since DCDU-11A does not support
power supply to transmission equipment.
BTS3900L (Ver.C)
Installation Guide
3 Information About the Installation
Issue 07 (2013-11-08) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
10
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