A fiber optic cable connects the RRU to the RBS main unit or an expanded macro RBS. The RRUs can be connected in a cascade configuration and a star configuration with optical cable links. User Guide About This Document About This Document Purpose This document describes the RRU hardware and provides instructions in hardware installation, cable connections, hardware installation check, and hardware maintenance. It also provides checklists as reference. In this document, eRRU3232 is used as an example. When wrapping the waterproofing tape, apply even force to extend the tape until the width of the tape is 1/2 of the original width. Start-up Below you will find brief information for RRU RFD01F Series.