User's Manual

Mobile WiMAX RAS SPI-2213 System Description/Ed.02

3.2 Detailed Structure

3.2.1 Digital Main Block (DMB)

The DMB supports the operation and maintenance of the SPI-2213, interfacing between the

SPI-2213 and ACR, and interfacing between the DU and RRH. It also collects and controls

alarms for the lower boards and modules, including the inter-processor communication

paths and RRH in the system. The DMB also generates and supplies clocks to the lower

hardware blocks, including the RRH, and processes channels for subscriber signals.

When the SPI-2213 sends signals to an MS, the DMB performs the OFDMA signal

processing on the traffic signals received from the ACR, converts them into optical signals

using the ‘Digital I/Q and C & M’ converter, and then sends them to the remote RRH.

Conversely, when the SPI-2213 receives signals from an MS, the DMB receives ‘Digital

I/Q and C & M’ signals from the remote RRH, performs the OFDMA signal processing on

them, and then sends them to the ACR.

Main Functions

y Creation and distribution of the reference clock

y Fast Ethernet/Gigabit Ethernet interface with ACR

y Fault diagnosis and alarm collection and control

y Alarm report

y Channel resource management

y OFDMA signal processing

y Automatic Gain Control (AGC) for the received RF signal and Received Signal

Strength Indicator (RSSI) support

y Supporting optical interfacing with the RRH and loopback test