单选题Voice activity detection （VAD） suppresses the transmission of silence patterns. On average， and assuming that a link carries at least 24 calls，what percentage of total bandwidth could VAD save？（）A 5B 15C 25D 35E 45F 55

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单选题

Voice activity detection （VAD） suppresses the transmission of silence patterns. On average， and assuming that a link carries at least 24 calls，what percentage of total bandwidth could VAD save？（）

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第1题

What can be used to maintain the voice quality on a link by limiting the number of calls that can be active at any given time？（）A、 Call Management Link AgentB、 Traffic policingC、 Call Admission ControlD、 QoS Link Congestion ManagementE、 Oversubscription Link Detection

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第2题

Which of the following statements regarding ISDN are correct?（）A、Each ISDN B channel has transmission speeds of up to 64 kbps.B、The ISDN B channel can carry video, voice or data.C、The ISDN B channel transmission rate varies depending on the service used.D、The ISDN D channel transmits control information.E、The ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.

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第3题

Which two statements are true about the protocols that are used for transmitting voice traffic？（）A、RTP multiplexing is used to keep multiple phone conversations separateB、RTP provides end-to-end delivery services for voice trafficC、UDP is used to ensure a reliable transmission from sender to receiverD、RTP is used to provide resource reservation for the voice streamE、UDP provides multiplexing

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第4题

Voice activity detection （VAD） suppresses the transmission of silence patterns. On average， and assuming that a link carries at least 24 calls， what percentage of total bandwidth could VAD save？（）A、5B、15C、25D、35E、45F、55

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第5题

VAD

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第6题

Which three are benefits of U-APSD?（）A、synchronization of the transmission and reception of voice framesB、bandwidth reservationC、optimized power-save mode periodsD、increased call capacityE、priority bandwidth and polling

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第7题

Which statements are true regarding ISDN channels?（）A、Each B channel can transmit up to 64 kbpsB、The ISDN B channel carries voice or dataC、The ISDN D channel transmits control information.D、The D channel transmission rate varies depending on the service used.E、HDLC or PPP can be used to encapsulate D channel information.

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Voice activity detection （VAD） suppresses the transmission o

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