User's Manual

Mobile WiMAX RAS SPI-2213 System Description/Ed.02
© SAMSUNG Electronics Co., Ltd. 3-7
Mobile WiMAX base station Main control board Assembly-General (MMA-G)
The MMA-G provides a main processor function of the SPI-2213, GPS signal receiving
and clock distribution, and network interface functions.
y Main Processor Function
The MMA-G is the board that carries out the role as the highest layer in the SPI-2213
and is equipped with the main processor. The main processor of the MMA-G performs
the functions, such as communication path setting between MS and ACR, Ethernet
switch function in the SPI-2213, system operation and maintenance and TDD signal
control.
The MMA-G manages the status of all hardware and software in the SPI-2213 and
reports each status information to WSM via ACR. In addition, the MMA-G allocates
and manages the resources of the SPI-2213 and the connection of the MMA-G and a
PC for the Web-EMT enables to maintain the SPI-2213 with no interworking with
ACR.
y GPS Signal Reception and Clock Distribution Function
The MMA-G is equipped with Universal Core Clock Module (UCCM) for GPS signal
reception.
The UCCM enables each block of the SPI-2213 to be operated in the synchronized
clock system. The UCCM mounted on the MMA-G 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 SPI-2213 and
operate the system.
If no GPS signal is received due to a fault when system operation, the UCCM carries
out the holdover function to provide the normal clock for a certain time as provided in
the existing system.
y Network Interface Function
The MMA-G interfaces with an ACR in Gigabit Ethernet or Fast Ethernet method.
The MMA-G can provide maximum two Gigabit Ethernet ports or four Fast Ethernet
ports per board, and support the link aggregation redundancy method.
The MMA-G can be divided as follows depending on the interface types provided by
MMA-G, and service provider can choose the interface type.
− MMA-GC: Four 100/1000Base-T Copper ports
− MMA-GM: Two 100/1000Base-T ports and two 1000Base-X Small Form factor
Pluggable (SFP) ports