The Base Band Unit Emulation feature in the CPRI LTE RF application is available with Option 760. It provides RRH test functionalities through the CPRI measurement interface, allowing you to test the RRH connectivity before the BBU is actually installed.

You can send an LTE waveform pattern and have the RRH transmit it over the air, thereby verifying the transmit functionality. LTE waveforms are available for different bandwidths: 5 MHz, 10 MHz, 15 MHz, and 20 MHz.

The BBU LTE RF test performs RRH-based measurements and displays the results for Return Loss (RL) and Voltage Standing Wave Ratio (VSWR). Return Loss measures the reflected power of the system in decibels (dB). VSWR is the ratio of voltage peaks to voltage valleys caused by reflections. You can set the return loss limit and VSWR limit to detect any transmission problem between the instrument, RRH, and antenna system.

Prior to running BBU tests, you must select and initialize the RRH. BBU scripts are included with Option 760 and are specific to an RRH model. They contain commands required to perform actions such as RRH initialization or to get VSWR or SFP data. If necessary, you can reload the scripts or download new scripts from an external USB device to the Anritsu instrument’s internal memory, as described in BBU Script Download.