User's Manual

RRU3278

Installation Guide

8 Installing RRU Cables

Issue 05 (2017-03-10)

Huawei Proprietary and Confidential

Figure 8-27 Installing an optical module

Long-time exposure to the air causes performance exceptions on the optical module.

Therefore, the optical module must be connected to fiber optic cables within 20 minutes after

being unpacked.

Step 2 Install CPRI optical cables.



The CPRI fiber optic cable must be installed in the cable clip near the power cable to

avoid being severely bent. The torque used to screw the cable clips is 1.4 N·m (12.39

lbf·in.).



Ensuring that CPRI optical cables are correctly connected before the RRU is powered on.

Otherwise, the RRU may become faulty, causing cells to fail to provide services.



When installing CPRI optical cables for dual-fiber bidirectional optical modules, remove

the dustproof cap from the optical cable, and connect the end labeled 1A and 1B on the

optical cable to the optical module on the RRU side, as shown in Figure 8-28. Connect

the DLC end labeled 2A and 2B to the CPRI port on the main control board (such as the

GTMU) or baseband processing board (such as the WBBP) in the BBU.