Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and()refers to call issues that cause variations in timing or time of arrival.A.echoB.jitterC.packet lossD.digitized sampling

题目
Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and()refers to call issues that cause variations in timing or time of arrival.

A.echo

B.jitter

C.packet loss

D.digitized sampling

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2.A balance sheet is simply the enumeration of the various assets of a business on one side of a ledger and the enumeration of various liabilities and (61) accounts on the other side. The two sides must be equal, or balance. Only one further point should be (62) : A balance sheet refers to a single point in time, for example, the close of business on December 31. Taken by itself, a balance sheet does not show (63) over time. It is what economists call a stock concept, not a (64) concept. That is, the balance sheet shows the stock of goods a firm has on hand at any particular instant and does not show the flow of goods through the firm over time. For this reason, a balance sheet does not show business (65) , which are a flow.(46)A．profitB．capitalC．incomeD．cash

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4.Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information aboA．Current development.B．Transmission of message.C．Computer networking.D．Government regulation.

更多“Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and()refers to call issues that cause variations in timing or time of arrival. ”相关问题

  • 第1题：

    An analog signal's characteristic quantity representing data may 66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68)elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70)number of well-defined discrete values that one of its characteristic quantities may take in time.

    A．acquire

    B．collect

    C．assume

    D．fetch


    正确答案：C

  • 第2题：

    A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?

    A.The motion of the apparent sun is along the ecliptic

    B.Measurement of time is along the celestial equator

    C.The speed of the Earth's revolution is not constant

    D.There are variations in the Earth's rotational speed


    正确答案：B

  • 第3题：

    Which word indicates color variation in the characteristics of a light?

    A.Opposing

    B.Changing

    C.Reversing

    D.Alternating


    正确答案：D

  • 第4题：

    Which of these terms refers to call issues that cause variations in timing or time of arrival？（）

    • A、queuing
    • B、jitter
    • C、packet loss
    • D、digitized sampling
    • E、signal-to-noise ratio ratio

    正确答案:B

  • 第5题：

    What is jitter？（）

    • A、The total end-to-end delay
    • B、The variations of delay.
    • C、The delay caused by placing the bits on the wire.
    • D、The time it takes for the bits to transit the physical media.

    正确答案:B

  • 第6题：

    Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival. 

    • A、 echo
    • B、 jitter
    • C、 packet loss
    • D、 digitized sampling

    正确答案:B

  • 第7题：

    Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival.

    • A、echo
    • B、jitter
    • C、packet loss
    • D、digitized sampling

    正确答案:B

  • 第8题：

    在SQL*PLUS中，显示执行时长的命令是（）

    • A、set time on
    • B、set timing on
    • C、set long
    • D、set timelong on
    • E、set sqlprompt

    正确答案:B

  • 第9题：

    单选题
    A light having characteristics which include color variations is defined as（）.
    A

    switching

    B

    alternating

    C

    oscillating

    D

    fluctuating


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Which word indicates color variation in the characteristics of a light?（）
    A

    Opposing

    B

    Changing

    C

    Reversing

    D

    Alternating


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）
    A

    The motion of the apparent sun is along the ecliptic

    B

    Measurement of time is along the celestial equator

    C

    The speed of the Earth's revolution is not constant

    D

    There are variations in the Earth's rotational speed


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Segregation of cargoes refers to（）.
    A

    separating cargoes so that the inherent characteristics of one cannot damage the other

    B

    separating cargoes by destination

    C

    classifying cargoes according to their toxicity

    D

    listing the cargoes in order of their flammability


    正确答案： C
    解析： 暂无解析

  • 第13题：

    The “lazier and more inventive” criminal refers to 。

    A. the car thief who stays at home

    B. one of those who put the ads in the paper

    C. one of the policemen in Changwa

    D. the owner of the pigeons


    正确答案：D
    考点：短语理解题。

  • 第14题：

    Segregation of cargoes refers to ______.

    A.separating cargoes so that the inherent characteristics of one cannot damage the other

    B.separating cargoes by destination

    C.classifying cargoes according to their toxicity

    D.listing the cargoes in order of their flammability


    正确答案：A

  • 第15题：

    The project manager must maintain an effective communication link with the customer’s satisfaction with the progress of the project. The project manager maintains this link through()

    A.Periodic project reports, periodic visits to the customer, and telephonic exchanges
    B.Subordinates, project team members, and the project sponsor
    C.One-time reports, weekly reports, and monthly reports
    D.The telephone, facsimile, and data transmission

    答案：A
    解析：
    在项目的进展过程中，为了维护客户满意度，项目经理必须与客户保持有效的沟通机制，项目经理通过（71）来达到这一目的。（71）A.周期性项目报告，给客户定期拜访，电话交流B.从属，项目组成员，项目赞助商C.一次性报告，周报告，月报告D.电话，传真和数据传输

  • 第16题：

    It seems that Shanghai is more more important than （）cities in China at that time.

    • A、each other
    • B、one another
    • C、any other
    • D、any

    正确答案:C

  • 第17题：

    When provisioning for Interactive-Video（e，g，video conferencing traffic）which three statementsdepicts the correct requirements？（）

    • A、Loss should be no more than 1 percent.
    • B、One-way latency should be no more than 150 ms
    • C、Jitter should be no more than 30 ms
    • D、Loss should be no more than 3 percent
    • E、One-way latency should be no more than 150/2=75 ms
    • F、Jitter should be no more than 300 ms

    正确答案:A,B,C

  • 第18题：

    Which statement is NOT a key QoS recommended requirement for voice bearer traffic?（）

    • A、Voice traffic should be marked to DSCP EF per the QoS baseline and RFC3246.
    • B、Voice traffic loss should be no more than 3%.
    • C、One-way latency （mouth-to-ear） should be less than 150 msec.
    • D、Average one way jitter should be targeted to less than 30 msec.
    • E、21-320 Kbps of guaranteed priority bandwidth is required per call depending on sample rate，codec，and  layer 2 overhead.

    正确答案:B

  • 第19题：

    Which statement about active and passive surveys is incorrect？（）

    • A、Active mode does not require the client to be specifically confgured
    • B、Passive mode can survey more than one access point at a time
    • C、Active mode yields signal-quality information such as packet retries and lost packets
    • D、Active mode requires more time to survey but yields more information results than passive mode does

    正确答案:A

  • 第20题：

    单选题
    What is jitter？（）
    A

    The total end-to-end delay

    B

    The variations of delay.

    C

    The delay caused by placing the bits on the wire.

    D

    The time it takes for the bits to transit the physical media.


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    There _____ more than one cause contributing to the accident.
    A

    were

    B

    was

    C

    be

    D

    have been


    正确答案： C
    解析：

  • 第22题：

    单选题
    Which of these terms refers to call issues that cause variations in timing or time of arrival？（）
    A

    queuing

    B

    jitter

    C

    packet loss

    D

    digitized sampling

    E

    signal-to-noise ratio ratio


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival.
    A

     echo

    B

     jitter

    C

     packet loss

    D

     digitized sampling


    正确答案： B
    解析： 暂无解析

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