User's Manual

Mobile WiMAX Indoor RAS SPI-2210 System Description/Ed.07

Mobile WiMAX base station Main control board Assembly-Standard (MMA-S)

The MMA-S carries out the main processor function and the GPS reception function.

The MMA-S has the redundancy configuration for reliability.

 Main Processor Function

The MMA-S is the board that carries out the role as the highest layer in the indoor

SPI-2210 and is equipped with the main processor. The main processor of the MMA-S

performs the functions, such as communication path setting between MS and ACR,

Ethernet switch function in the indoor SPI-2210, system operation and maintenance

and TDD signal control.

The MMA-S manages the status of all hardware and software in the indoor SPI-2210

and reports each status information to WSM via ACR. In addition, the MMA-S

allocates and manages the resources of the indoor SPI-2210 and the connection of the

MMA-S and a PC for the Web-EMT enables to maintain the indoor SPI-2210 with no

interworking with ACR.

The MMA-S has the redundancy configuration of active/standby to allow the standby

MMA-S to replace the function of the active MMA-S when a fault occurs in the active

MMA-S.

 GPS Reception and Clock Distribution Function

The MMA-S is equipped with Universal Core Clock Module (UCCM) for GPS

reception. The UCCM enables each block of the indoor SPI-2210 to be operated in the

synchronized clock system. The UCCM mounted on the MMA-S creates the system

clocks[56 MHz, 12.5 Hz (80 msec), PP2S, analog 10 MHz, 61.44 MHz] by using the

reference signal received from a GPS and distributes them to the hardware blocks in

the system. These clocks are used to maintain the internal synchronization of the

indoor SPI-2210 and operate the system.

If no GPS signal is received due to a fault, the UCCM carries out the holdover

function to provide the normal clock for a certain time as provided in the existing

system. In addition, if a fault occurs in the UCCM of the active MMA-S, the

redundancy status between the UCCMs of the active MMA-S and the standby MMA-S

is switched and then the redundancy status between MMA-Ss is, also, switched

immediately.

 Network Interface Function

The MMA-S interfaces with an ACR in Gigabit Ethernet or Fast Ethernet method.

At this time, the Ethernet interface with the ACR is duplicated in the link aggregation

method. The MMA-S can provide maximum two Gigabit Ethernet ports or four Fast

Ethernet ports per board, and support the link aggregation redundancy method.

The MMA-S can be divided as follows depending on the interface types provided by

MMA-S, and service provider can choose the interface type.