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You suspect that your automatic modem dialer is not working correctly. Which of the following commands will manually dial the number 123-4567?

  • A.AT1234567
  • B.ATDT1234567
  • C.AT1234567DL
  • D.ATM 1234567
  • E.None of the above

Answer: B

Correct answer: ATDT1234567

Modems obey the Hayes command set: AT gets the modem’s attention, D means dial and T selects tone dialling, so ATDT1234567 dials that number. ATDP would dial it with pulses.

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