2 RRU and SRXU Hardware User Guide Label Color Status Description The optical module is not in position or is powered off. CPRI_E Red/green ON (green) The CPRI link is normal. RRU indicators light are briefly abrivated as follows (PWR, RUN, ALM, ACT, VSWR, SYNC, CPRI 0, CPRI 1). These indicator lights (LEDs) help you quickly understand the unit's status without logging into the system. While the exact labels may vary slightly by vendor (like Huawei, Ericsson, Nokia), the. The SRXU is an extended RF interface module that provides two RX channels for RF signals. 3 RRU Cables The RRU cables include the PGND cable, power cable, AISG multi-wire cable, AISG extension cable, CPRI optical cable, RF jumper, and alarm cable. On the left is a front view of the RRU. HW&Frequent Alarm • - HW alarm & procedure • - frequently alarm & procedure • - follow alarm from BE & procedure HW alarms & Procedure • 1. Hardware overview • DU Board: DUL20 Port Connector Description RI A-F SFP Interface DU-RU (electrical) or DU-RRU (optical) TN A RJ-45. Problem 3: The switch indicator is red after the optical module is inserted Reasons and solutions: The main reason is that the optical module is incompatible. You can open the operation data and check the manufacturer information of the optical module. If it is incompatible with the switch brand. This document describes routine maintenance procedures for an RRU3252/RRU3256 (referred to as RRU in this document), such as equipment preventive maintenance and power-on and power-off operations.