User's Manual

CHAPTER 3. SPI-2213 Architecture
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RRH
The RRH is a unified RF module interfacing remotely with the DU through an optical
cable. It is located at the front end of the antenna.
On a downlink, it converts the data traffic in the form of ‘Digital I/Q and C & M’ received
from the MRA-F of the DU into RF signals, which have up to 8W/carrier/sector output,
and then sends them through an external antenna.
Conversely, on an uplink, the RRH converts the RF signals received through the antenna
into ‘Digital I/Q and C & M’ data traffic, and then sends them to the MRA-F of the DU.
The RRH also receives clock information from the DU through the ‘Digital I/Q and C &
M’ interface, and sends/receives alarm/control messages.