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what are the three main component of a catering control system?

Office phone systems usually have the following components:?


-The PBX’s internal switching network

-Microcontroller or microcomputer for arbitrary data processing, control and logic

-Logic cards, switching and control cards, power cards and related devices that facilitate PBX operation

-Stations or telephone sets, sometimes called lines

-Outside Telco trunks that deliver signals to (and carry them from) the PBX

-Console or switchboard allows the operator to control incoming calls

-Uninterruptible Power Supply (UPS) consisting of sensors, power switches and batteries

-Interconnecting wiring

-Cabinets, closets, vaults and other housings

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Q: What are the four components of a business system?
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