User's Manual

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Chapter 3 System Structure

LTE eNB System Description v2.0 30

 10GE interface

The LCC4 provides a 10GE interface to support UL CoMP between DUs.

FANM-C4A

The FANM-C4A is the system’s cooling fan used to maintain the internal CDU

shelf temperature. With this fan, the system can operate normally when the outside

temperature of CDU shelf changes.

RRH (LTE FDD, 700 MHz)

The RRH is installed outdoor by default with a natural cooling convection system.

The RRH, having 4Tx/4Rx, 2Tx/4Rx or 2Tx/2Rx RF chains, is an integrated RF

module consisting of a transceiver, a power amplifier, and a filter in an outdoor

enclosure.

The major functions of the RRH are as follows:

 700 MHz (DL: 746 to 756MHz, UL: 777 to 787MHz)

 Supports 10 MHz 4Tx/4Rx, 2Tx/4Rx or 2Tx/2Rx per RRH

 Supports 10 MHz 1 carrier/1 sector

 In case of 4T, 40 W per path (Total 160 W), Max 160 W per carrier

 In case of 2T, 60 W per path (Total 120 W), Max 120 W per carrier

 Up/Down RF conversion

 Performs LNA function

 Amplifies the RF signal level

 Suppresses spurious waves from the bandwidth

 Includes E/O and O/E conversion module for the optical communication with

CDU

 Supports Remote Electrical Tilting (RET)