Telephony and Switching Crossword

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Across
  1. 3. this is used to create sound
  2. 4. Small error that occurs when converting an analogue to a digital system
  3. 8. Acronym for the body responsible for regulating telecommunications in Australia.
  4. 10. a microphone that delivers a unidirectional sound response curve
  5. 11. Acronym for a system that transmits voice via the internet
  6. 13. Unit of a logarithmic measure of the effectiveness of sound
  7. 15. RMS voltage of a typical ring signal
  8. 16. the part of the telephone system that converts 2 wire into a 4 wire connection
Down
  1. 1. of frequency
  2. 2. transmitters and receivers are types of these
  3. 5. the type of pressure related to sound
  4. 6. Unit of pressure
  5. 7. the amplitude of sound
  6. 9. A device that connects a computer or a fax machine to the telephone system
  7. 12. the colour of the TRC conductor
  8. 14. the frequency of sound
  9. 17. Acronym for dialing system using a frequency matrix