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Introduction
Cell sites today have a distributed architecture of the radio that consists of the radio equipment control
(REC) or base band unit (BBU) installed at the bottom of the tower and the radio equipment (RE) or
remote radio head (RRH) installed at the top of the tower. These two elements communicates with
each other via the Common Public Radio Interference (CPRI) protocol over fiber links.
This distributed architecture provides the benefit of replacing coax-based feeders with fiber- based
feeders, significantly reducing the problems of signal loss and reflections. However, since all the RF
interfaces reside on the RRH, any RF maintenance or troubleshooting requires climbing to the top of
the tower to access the RRH, increasing operational cost and unnecessary safety issues.
JD700B series analyzers provide the option of RFoCPRI that allows you to perform RF maintenance
and troubleshooting activities on the ground via the fiber interfaces at the BBU, significantly reducing
maintenance time and operational expenses. Thanks to the RFoCPRI technology, you can verify the
CPRI control signals and extracts the IQ data transmitted between the BBU and RRU to monitor and
analyze the uplink interferences and the downlink signals.
The RFoCPRI option provides following measurements and analysis:
Layer 2 monitoring
Layer 2 terminate testing
Interference analysis including spectrum, spectrogram, RSSI, and spectrum replay
PIM detection of single or multiple carrier(s)
Display overview
Figure 253 provides descriptions for each segment of the measurement screen.
Figure 253 RFoCPRI analysis screen
JD700B Series User's Guide
Chapter 15 Using RFoCPRI Interference Analyzer
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