표 2. | Table 2. AWB 메인보드 | Mainboard of advanced wireless bridge(AWB).

Name	Functions
Power block	Provide DC24V as power supply
PMIC	Power management IC
Ethernet block	Provide interface with outside
External UART	Asynchronous communication with FRTU through serial communication protocol
Relay protection	Switching relay protection to match TTL level
MPU boot configuration	Config setting at OS(linux) boot
Memory	Save OS and device status
MPU	Performs core functions of AWB
RF module	900 MHz, 2.4 GHz RF module
Security module	Encript by installing the KCMVP module