The traditional way of allocating a single channel among multiple competing users is to chop up its ( ) by using one of the multiplexing schemes such as FDM (Frequency Division Multiplexing). If there are N users, the bandwidth is divided into N equal-si

题目
The traditional way of allocating a single channel among multiple competing users is to chop up its ( ) by using one of the multiplexing schemes such as FDM (Frequency Division Multiplexing). If there are N users, the bandwidth is divided into N equal-sized portions, with each user being assigned one portion. Since each user has a private frequency ( ), there is no interference among users.When there is only a small and constant number of users, each of which has a steady stream or a heavy load of ( ), this division is a simple and efficient allocation mechanism. A wireless example is FM radio stations. Each station gets a portion of the FM band and uses it most of the time to broadcast its signal.However, when the number of senders is large and varying or the traffic is ( ), FDM presents some problems. If the spectrum is cut up into N regions while fewer than N users are currently interested in communicating, a large piece of valuable spectrum will be wasted. If more than N users want to communicate, some of them will be denied ( 本题 ) for lack of bandwidth.??

A. allowance
B. connection
C. percussion
D. percussion
相似考题

1.在通信专业中，TDM的英文全称是（），“基带”英文通常翻译为（）。A．Time Delay Method B．Transmission Delay Method C．Time Division Multiplexing D．Time Dividing MultiplexingA．sideband B．baseband C．dual band D．single band

2.对于LTE物理层的多址方案，在下行方向上采用基于循环前缀(Cyclic Prefix，CP)的正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)，在上行方向上采用基于循环前缀的单载波频分多址(Single Carrrier-Frequency Division Multiplexing Access，SC-FDMA)。()

3.F－OFDM英文全称是Flexible Orthogonal Frequency Division Multiplexing,中文叫灵活的正交频分复用。()此题为判断题(对，错)。

4.在通信专业中，WDM的英文全称是（），“吞吐量”英文通常翻译为（）。A．Wierless Digital Modulation B．Wave Division Multiplexing C．Wavelength Division Multiplexing D．Wireless Data Modulation A．traffic flow B．rate C．throughout D．throughput

参考答案和解析
答案：D
解析：
更多“The traditional way of allocating a single channel among multiple competing users is to chop up its ( ) by using one of the multiplexing schemes such as FDM (Frequency Division Multiplexing). If the”相关问题

  • 第1题：

    In order to link data centers, a customer is evaluating the installation of fiber optic cable between buildings that are 400 meters apart. The installation will require multiple patch panels and cables.Which of the following is the most critical factor to consider for this installation?（）

    A. I/O rate

    B. bandwidth

    C. signal loss

    D. Dense Wavelength Division Multiplexing (DWDM)


    参考答案：C

  • 第2题：

    The traditional way of allocating a single channel,such as a telephone trunk,among multiple competing users is to chop up its （ ） by using one of the multiplexing schemes, such as FDM. If there are N users, the bandwidth is divided into N equal-sized portions,with each user being assigned one portion.Since each user has private frequency （ ） ,there is now no interference among users.When there is only a small and constant number of users,each of which has a steady stream or heavy load of （ ）this division is a simple and efficent allocation mechanism.A wireless example is FM radio stations.Each station gets a portion of the FM band and uses it at most of the time to broadcast its signal. However when the number of senders is large and varying or the traffic is （ ） ,FDM presents some problems.If the spectrum is cut up into N regions and fewer than N users are currently intrested in communicating ,a large piece of valuable spectrum will be wasted.And if more than N users want to communicate ,some of them will be denied （ ）for lack of bandwidth,even if some of the users who have been assigned a frequency band ever transmit or receive anything.

    A.capabilityB.capacityC.abilityD.powerA.bandB.rangeC.domainD.assignmentA.trafficB.dataC.informationD.communicationsA.ContinuousB.steadyC.burstyD.flowA.allowanceB.connectionC.percussionD.permission


    正确答案：B,A,A,C,D

  • 第3题：

    The traditional way of allocating a single channel among multiple competing users is to chop up its ( ) by using one of the multiplexing schemes such as FDM (Frequency Division Multiplexing). If there are N users, the bandwidth is divided into N equal-sized portions, with each user being assigned one portion. Since each user has a private frequency ( ), there is no interference among users.When there is only a small and constant number of users, each of which has a steady stream or a heavy load of ( 本 题 ), this division is a simple and efficient allocation mechanism. A wireless example is FM radio stations. Each station gets a portion of the FM band and uses it most of the time to broadcast its signal.However, when the number of senders is large and varying or the traffic is ( ), FDM presents some problems. If the spectrum is cut up into N regions while fewer than N users are currently interested in communicating, a large piece of valuable spectrum will be wasted. If more than N users want to communicate, some of them will be denied ( ) for lack of bandwidth.?

    A. traffic
    B. date
    C. bursty
    D. flow

    答案：A
    解析：

  • 第4题：

    Time division multiplexing时分多路复用


    正确答案: 一种通用的多路复用技术，容许多个发送方通过公共介质发送，各发送方轮流使用介质。

  • 第5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 separate
    • B、RTP provides end-to-end delivery services for voice traffic
    • C、UDP is used to ensure a reliable transmission from sender to receiver
    • D、RTP is used to provide resource reservation for the voice stream
    • E、UDP provides multiplexing

    正确答案:E

  • 第6题：

    Which three statements about subqueries are true?（）

    • A、A single row subquery can retrieve only one column and one row.
    • B、A single row subquery can retrieve only one row but many columns.
    • C、A multiple row subquery can retrieve multiple rows and multiple columns.
    • D、A multiple row subquery can be compared by using the “>” operator.
    • E、A single row subquery can use the IN operator.
    • F、A multiple row subquery can use the “=” operator.

    正确答案:B,C,E

  • 第7题：

    对于LTE物理层的多址方案，在下行方向上采用基于循环前缀（Cyclic Prefix，CP）的正交频分复用（Orthogonal Frequency Division Multiplexing，OFDM），在上行方向上采用基于循环前缀的单载波频分多址（Single Carrrier-Frequency Division Multiplexing Access，SC-FDMA）。在上行方向上采用基于循环前缀的单载波频分多址（Single Carrrier-Frequency Division Multiplexing Access，SC-FDMA）。


    正确答案:正确

  • 第8题：

    802.11b是基于正交频分复用（Orthogonal Frequency Division Multiplexing，简称OFDM）技术的协议。


    正确答案:错误

  • 第9题：

    You want to take the backup of the USERS tablespace. It has a single data file of 900 MB. You have tape drives of 300 MB each. The SBT channel is configured for Recovery Manager (RMAN). To accomplish the backup, you issued the following RMAN command: RMAN> BACKUP SECTION SIZE 300M TABLESPACE users; Which two statements are true about the execution of the above command? （）(Choose two.)

    • A、The backup piece size will be limited to 300 MB
    • B、The RMAN uses multiplexing to perform backup
    • C、The operation is accomplished using the default channel available
    • D、The RMAN parallelizes the backup although the parallelism is not set for a channel

    正确答案:A,C

  • 第10题：

    单选题
    In order to link data centers, a customer is evaluating the installation of fiber optic cable between buildings that are 400 meters apart. The installation will require multiple patch panels and cables. Which of the following is the most critical factor to consider for this installation?（）
    A

    I/O rate

    B

    bandwidth

    C

    signal loss

    D

    Dense Wavelength Division Multiplexing (DWDM)


    正确答案： D
    解析： 暂无解析

  • 第11题：

    判断题
    802.11b是基于正交频分复用（Orthogonal Frequency Division Multiplexing，简称OFDM）技术的协议。
    A

    对

    B

    错


    正确答案： 错
    解析： 暂无解析

  • 第12题：

    名词解释题
    frequency division multiplexing频分多路复用

    正确答案： 一种常用的多路复用技术，容许多个发送方通过公共介质发送。由于每个发送方使用不同的频率，多个发送方能同时发送而不会冲突。
    解析： 暂无解析

  • 第13题：

    OFDM的英文是()

    A.OverloadFrequencyDivisionMultiplexing

    B.Orthogonal?Frequency?Division?Multiplexing

    C.Overwhelming?Frequency?DivisionMultiplexing

    D.Outstanding?Frequency?Division?Multiplexing


    正确答案：B

  • 第14题：

    Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?()

    A. optical technology for transmitting up to 32 channels over multiple fiber strands

    B. optical technology for transmitting up to 16 channels over multiple fiber strands

    C. a WDM system that is compatible with EDFA technology

    D. a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .


    参考答案：C, D

  • 第15题：

    frequency division multiplexing频分多路复用


    正确答案: 一种常用的多路复用技术，容许多个发送方通过公共介质发送。由于每个发送方使用不同的频率，多个发送方能同时发送而不会冲突。

  • 第16题：

    Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（）

    • A、optical technology for transmitting up to 32 channels over multiple fiber strands
    • B、optical technology for transmitting up to 16 channels over multiple fiber strands
    • C、a WDM system that is compatible with EDFA technology
    • D、a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .

    正确答案:C,D

  • 第17题：

    Which two statements are true about optical networks?（）

    • A、SONET and SDH both use time-division multiplexing.
    • B、An optical transport network system uses time-division multiplexing.
    • C、SONET and SDH both use wavelength-division multiplexing.
    • D、An optical transport network system uses wavelength-division multiplexing.

    正确答案:A,D

  • 第18题：

    DWDM英文全称Dense Wavelengh Division Multiplexing，中文释义为（）。


    正确答案:密集波分复用

  • 第19题：

    FDM的英文是（）

    • A、Overload Frequency Division Multiplexing 
    • B、Orthogonal Frequency Division Multiplexing 
    • C、Overwhelming Frequency Division Multiplexing 
    • D、Outstanding Frequency Division Multiplexing

    正确答案:B

  • 第20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 separate
    • B、RTP provides end-to-end delivery services for voice traffic.
    • C、UDP is used to ensure a reliable transmission from sender to receiver.
    • D、RTP is used to provide resource reservation for the voice stream.
    • E、UDP provides multiplexing of multiple phone conversations.

    正确答案:B,E

  • 第21题：

    WDM与（）本质是相同的。

    • A、OFDM(optical frequency division multiplexing)
    • B、OTDM(optical time division multiplexing)
    • C、CDM(code division multiplexing)
    • D、EDFA(erbium doped fiber amplifier)

    正确答案:A

  • 第22题：

    多选题
    You want to take the backup of the USERS tablespace. It has a single data file of 900 MB. You have tape drives of 300 MB each. The SBT channel is configured for Recovery Manager (RMAN). To accomplish the backup, you issued the following RMAN command: RMAN> BACKUP SECTION SIZE 300M TABLESPACE users; Which two statements are true about the execution of the above command? （）(Choose two.)
    A

    The backup piece size will be limited to 300 MB

    B

    The RMAN uses multiplexing to perform backup

    C

    The operation is accomplished using the default channel available

    D

    The RMAN parallelizes the backup although the parallelism is not set for a channel


    正确答案： C,A
    解析： 暂无解析

  • 第23题：

    多选题
    Which two statements are true about optical networks?（）
    A

    SONET and SDH both use time-division multiplexing.

    B

    An optical transport network system uses time-division multiplexing.

    C

    SONET and SDH both use wavelength-division multiplexing.

    D

    An optical transport network system uses wavelength-division multiplexing.


    正确答案： A,B
    解析： 暂无解析

  • 第24题：

    名词解释题
    Time division multiplexing时分多路复用

    正确答案： 一种通用的多路复用技术，容许多个发送方通过公共介质发送，各发送方轮流使用介质。
    解析： 暂无解析

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