Huawei BBU3900 Hardware Description page 82

5 Auxiliary Devices of the BBU3900
clock source. These timing signals and positioning information can be used to generate PPS
signals and Network Assisted GPS (AGPS) positioning information. The WGRU is optional for
the NodeB which is installed in the WGRU box. The NodeB can be configured with one WGRU
which provides the positioning function.
5.8 SLPU
The signal lightning protection unit (SLPU), which can be optionally configured with the UFLP,
UELP, or USLP2, provides the signal surge protection.
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BBU3900
Hardware Description
Issue 11 (2010-11-10)