The CPU Card is the system’s control center. It provides the system’s Linux operating system, central processing, stored program, and memory for the customer’s site-specific data. Every system requires a CPU Card. In addition, it also provides:

• CompactFlash card interface (for IntraMail, software loading, and database backup)
• Conference circuits, DTMF receivers and DTMF generators
• Real Time Clock
• NAND Flash for storing the system database
• Battery for short term (14 day) backup of the Real Time Clock and station parameters
• Two audio inputs for Background Music and Music on Hold (1/8” mono minijacks)
• One audio output for External Paging (1/8” mono minijack)
• Ethernet and USB ports for local and remote PC Programming
• RS-232 serial port for Station Message Detail Recording
• Built-in V.32BIS 14.4K BPS modem for remote maintenance

The CPU also has a reset switch that provides the following three functions:

• System reset (when momentarily pressed).
• System initialization (when held down as power is turned on).
• Software update (when held down for 6 seconds with software update CompactFlash installed).