LTE TDD 
BBU3900&BBU3910 Description 
 
Huawei Proprietary and Confidential     
Copyright © Huawei Technologies Co., Ltd. 
 
Figure 1-26 FANe panel 
 
 
Functions 
The FAN dissipates heat from the BBU3900&BBU3910. It monitors the inlet temperature, 
controls the rotation speed of the fans, and reports the status of the fans to the LMPT or 
UMPT in the BBU3900&BBU3910. 
1.3.12 UCCU 
The UCCU, a universal inter-connection combo unit, allows a long-distance connection 
between the BBU and USU, allowing a remote distance connection in BBU interconnection 
scenarios. 
Panel 
Figure 1-27 shows the UCCU panel. 
Figure 1-27 UCCU panel 
 
 
Functions 
The UCCU exchanges baseband data between BBUs, allowing a long-distance connection 
between the BBU and USU in BBU interconnection scenarios. 
Ports 
Table 1-14 lists the ports on the UCCU.