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.
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 (3.5mm 1/8" mono mini jack)
One audio output for External Paging (3.5mm 1/8" mono mini jack)
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
IntraMail flash card pictured is an option and not included
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)
Current Tech Tip
Upgrading System Firmware on the NEC SL2100 Phone System