CPU-D4 board

This board is always mounted in the first position of the first cabinet.
The functions of the CPU-D4 are:
• Central Processor
• Program and data memory
• Conference unit
• Switch
• Real-time clock
• One V.24 port for local operation and maintenance
• Two V.24 ports that can be used for other purposes such as CIL or Hotel Computer connections
• One configurable RS 485 long range port
• V.32bis modem for remote maintenance
• Connection of temperature sensors
• FECU connection
• Audio port for music-on-hold.
• Data buffer for 500 call-information logging records in case of V.24 connection failures.
• Extension line boards