NOTE
l The procedure for installing an RRU is not described in this document. For details about how to install
an RRU, see the associated RRU installation guide according to the RRU model.
l The Outdoor Cable Conversion Box (OCB) is an optional component, which is used to connect cables
with different cross-sectional areas. For details about an OCB, see the OCB User Guide.
12.3 Installing Components in a 19-Inch Rack
A BBU and DCDU-03B can be installed in a 19-inch rack. In addition, a WCDMA GPS
Receiving Unit (WGRU) can also be installed in the rack based on actual requirements.
12.3.1 Installing a BBU
This section describes the procedure and precautions to be taken for installing a BBU in an
APM30H, TMC11H, or 19-inch rack. A BBU occupies a space of 19 inch wide and 2 U high.
Context
In the triple mode scenario, two BBUs are required. A second BBU is installed in the same
manner as the first BBU.
Procedure
Step 1 Align mounting holes on the cable holders with mounting holes on both sides of a BBU, and
then use four M4 screws to secure the cable holes until the tightening torque reaches 1.2 N·m,
as shown in Figure 12-3.
Figure 12-3 Installing cable holders on a BBU
Step 2 Wear ESD gloves or ESD wrist strap, and then slide the BBU into the cabinet along the guide
rails using both hands.
Step 3 Tighten four M6x16 screws on the panel until the tightening torque reaches 3 N·m, as shown in
Figure 12-4.
DBS3900 (Ver.B)
Installation Guide
12 Indoor Scenario with DC Power Supply (BBU Installed in
a 19-Inch Rack)
Issue 06 (2011-09-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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