Protocol Settings
R&S
®
EX-IQ-BOX
129
User Manual 1409.5570.32 ─ 05
CPRI REC
(Radio Equipment Control)
Digital IQ data
R&S
IQ format
Bidirectional
mode
R&S
IQ format
USB control
R&S SMU200A
Baseband
Transmitter
(Uplink)
R&S FSQ
Receiver
(Downlink)
R&S DigIConf
Optical or
electrical link
Reference
CPRI link
Uplink
Downlink
Breakout Board
R&S EX-IQ-BOX
Digital IQ data
Fig. 7-46: CPRI REC test scenario, with the R&S
EX-IQ-BOX emulating the RF module RE
Also in this test setup, DL and UL either can be tested simultaneously, i.e. full duplex, or
Uplink/Downlink individually.
7.2.2 CPRI Transmission Protocol - Overview
In the digital link, the I/Q baseband data and control information are transmitted together
in one link. The I/Q data and controlling data are embedded in the transmission protocol
with the aid of the multiplex procedure. The overview shows, how the protocol is built up.
Fig. 7-47: CPRI protocol overview
CPRI defines the layer 1 and layer 2 protocols for the transfer of user plane data, control
& management plane data as well as synchronization information between a REC and a
RE as well as between two REs.
The interface supports the following types of information flows:
●
I/Q Data
CPRI
Summary of Contents for EX-IQ-BOX
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