Question

CHAPTER 7 Signaling Systems TO. Name five factors that should be taken into consideration when selecting a paging system. 11. Assume the surrounding noise level in a certain area of the plant is 80 decibels. If a message is to be clearly heard, what should be the minimum sound level of the message? 12. How many tones can be generated by the paging system? 13. What is used as the central control unit for the fire alarm system? _ 14. What is the function of the processor? 15. What is the maximum number of processors that can be connected to the CCU? 16. What voltage is supplied to the processor? 7. What supplies power to the system if the incoming AC power should fail?

Answer 1

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10: Five different factors that should be considered before slecting a paging system are:

1. Determine the required speaker size according to the room area.

2. Determine the required number of speakers and the spacing between them.

3. Decide if each paging speaker is to be equipped with its own amplifier and built-in volume control. This is done especially for larger installations, so that each speaker is a sub system in itself.

4. Choose whether you want a centrally amplified system or individually amplified systems. Centrally amplified systems typically operate on 70 volt supply, versus individually amplified systems, which operate on 24 volts.

5. The type of speaker installations are also to be considered, for example, is it to be installed in walls, or ceilings, re bridges or back-boxes to be used etc.

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