Step 4 Check whether floating nuts are configured on both sides of the 19-inch subrack. If not, install
the floating nuts delivered with the DDF on both sides of the 19-inch subrack.
Step 5 Align the DDF with the subrack, slide it into the subrack, and tighten the screws on both sides
of the DDF, as shown in Figure 11-27.
NOTE
The DDF is preferably installed in the position labeled A in the figure. If the space is limited, you can
install it in the position labeled B in the figure.
Figure 11-27 Installing the DDF in the APM30H
----End
11.6 Replacing the Fuse
When certain power equipment, which has high current requirements, is connected to a DC
output port on the EPS subrack, the fuse on the port need to be replaced if it cannot meet the
high-current requirement. Replacing the fuse that controls the port for supplying power to the
BBU disrupts all the services carried by the base station.
Prerequisite
l The tools and materials, such as an ESD wrist strap or a pair of ESD gloves, new fuse, ESD
box or bag, and key to the cabinet door, are ready.
l The quantity and model of the faulty fuses are confirmed, and new fuses of the same quantity
and model are ready.
l The authorized personnel are permitted to enter the site. The required keys are available.
Context
l Figure 11-28 shows the installation position of the fuse and spare fuse box in the EPS
subrack.
BTS3900A(Ver.B)
Installation Guide 11 Installing Optional Modules
Issue 01 (2011-10-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
76
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