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Sample Questions:What does Automatic Gain Control (AGC) do?It turns down the volume to the far-end microphone.It turns up the volume to the far-end microphone.It builds the volume to the near-end microphone.It selects among multiple microphones.Which of the following correctly describes reverberation and echo?Reverberation is long, distinct, acoustic reflections.Reverberation is irrelevant to conferencing audio.Echo is a coherent, distinct carry-on of sound.Echo is short, diffuse, acoustic reflections that linger after the original sound has stopped.Reverberation is an incoherent, diffuse, carry-on of soundWhich of the following accurately describes room gain as it applies to acoustic echo cancellation?Relative sensitivity of the microphones expressed in dB versus the same microphone in a "free field" environmentRelative perceived loudness of a person speaking in a given room versus the same person speaking in an anechoic chamberRatio of loudness of the participants voices versus the loudspeaker volume arriving at the microphoneMeasure of amplifier power driving the loudspeakers in a given conference roomWhich of the following correctly describes typical audio phantom power?12 volts DC applied to the tip and ring of a TRS connector used to power amplified headphonesA DC voltage applied to pins 2 and 3 of an XLR connector returning through pin 1, used to power microphonesA DC voltage applied to the center pin of an RCA type connector used to power remote pre- amplifiers48 volts DC applied to a telephone circuit center pair used to provide power to the telephone setWhich of the following functions can NOT be performed by a microphone mixer?Provide phantom power to microphones.Provide a means to adjust the relative gain of different microphones.Provide gain to convert mic-level signals to line-level signals.Provide a means to adjust the video display brightness.Provide a means to adjust the room acousticsThe H.323 Media Gateways require H.323 Terminals, which wish to make calls through the Gateway to ISDN sites, toperform a test with the other H.323 Terminals first.be registered with the Gatekeeper first.be using a Gatekeeper Prefix defined on the End Point.be using a Gateway Prefix registered on an Active Gatekeeper.be registered with the MCU first.call the Network administrator first.

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