User's Manual

Mobile WiMAX RAS SPI-2213 System Description

CHAPTER 3. SPI-2213 Architecture

3.1 System Configuration

3.1.1 DU and RRH

The SPI-2213 has a separate structure consisting of a DU and RRHs.

Because up to three RRHs can be connected to a DU, the maximum 2Carrier/3Sector

service is possible.

The DU is composed of a Digital Main Block (DMB), DPM-FI, and FAN-FD48.

y DMB

The DMB operates and maintains the SPI-2213, enables the SPI-2213 to interface with

ACR and provides the communication path between processors in the system.

The DMB creates the reference clock, provides the clock to the lower hardware block

and performs the signal processing function for the subscriber signal.

The DMB also interfaces with the RRH to send and receive data traffic, and receives

and controls alarms for the lower hardware blocks or modules, including the RRH.

y DPM-FI

The DPM-FI receives DC power through a separate rectifier and distributes it to every

board and module on the DU shelf. The operator can control DC power supply by

turning the circuit breaker at the front of the DPM-FI on/off.

y FAN-FD48

The FAN-FD48 is composed of a set of four fans and maintains the inside temperature

of the DU within an appropriate range so that the SPI-2213 can operate normally.

The FAN-FD48 detects the inside temperature of the DU using a built-in temperature

sensor and sets the speed of the fan in accordance with the detected temperature.