Huawei DBS3900 Installation Manual page 23

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Installation Guide
Figure 5-8 Installation clearance for an RHUB3908 installed in a 19-inch cabinet, rack, or shelf
Figure 5-9
respectively when the RHUB3908 is installed on a wall.
Figure 5-9 Recommended installation clearance for a wall-mounted RHUB3908 (unit: mm)
Issue 08 (2015-01-15)
and Figure 5-10 shows the recommended and minimum installation clearance
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5 Installing an RHUB3908
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