When a router converts analog signals to digital signals, wh

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When a router converts analog signals to digital signals, what three steps are always included in the process?()
A

involution

B

encoding

C

sampling

D

quantization

E

compression

F

companding

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相似问题和答案

第1题:

Which ISDN device converts the four-wire BRI signals from an S/T interface into two-wire signals of a U interface?()

A.TE1

B.NT-2

C.TA

D.TE2

E.NT-1


参考答案:E

第2题:

When analog signals are digitized using the G.711 codec, voice samples are encapsulated into protocol data units (PDUs) involving which three headers? ()

  • A、IP
  • B、TCP
  • C、RTP
  • D、UDP
  • E、H323
  • F、CRTP

正确答案:A,C,D

第3题:

When comparing analog display inputs to digital display inputs, which of the following is anadvantage that digital has over analog?()

A. Allows for higher brightness

B. More crosstalk

C. Sustains higher resolutions

D. Supports widescreen resolutions


参考答案:C

第4题:

When a router converts analog signals to digital signals, what three steps are always included in the process?()

  • A、involution
  • B、encoding
  • C、sampling
  • D、quantization
  • E、compression
  • F、companding

正确答案:B,C,D

第5题:

Which three functions are associated with a Cisco Unified CallManager? ()

  • A、 connects traditional telephony devices to voice over IP infrastructure
  • B、 converts analog signals to digital format
  • C、 performs voice compression
  • D、 performs call processing
  • E、 performs dial plan administration
  • F、 performs signaling and device control

正确答案:D,E,F

第6题:

Which of the following describes the roles of devices in a WAN? ()

A.A CSU/DSU terminates a digital local loop

B.A modem terminates a digital local loop

C.A CSU/DSU terminates an analog local loop

D.A modem terminates an analog local loop

E.A router is commonly considered a DTE device

F.A router is commonly considered a DCE device


参考答案:A, D, E

第7题:

Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks?()

  • A、The three required steps in the analog to digital conversion are sampling,encoding,and compression.
  • B、The three required steps in the analog to digital conversion are sampling,quantization,and compression.
  • C、The three required steps in the analog to digital conversion are sampling,quantization,and encoding.
  • D、The output of the sampling process is a pulse code modulation (PCM) signal.
  • E、The output of the sampling process is a pulse amplitude modulation (PAM) signal.

正确答案:C,E

第8题:

Digital data can also be represented by (71)signals by use ofa modem. The modem converts a series of binary voltage (72) into an analog signal by encoding the digital data ontoa carrier frequency. The resulting signal occupies a certam spectrum of (73) centered about the carTier and may be propagated acrossa medium suitable for that carrier. The most common modems represent digital data in the voice(74)and hence allow those datato be propagated over ordinary voice-grade (75 )lines At the other end of the line, another modem demodulates the signal to recover the original data

(71)

A.analog

B.digital

C.Modem

D.electric


正确答案:A
数字数据也可以通过调制解调器用模拟信号来表示。调制解调器把数字数据编码为一种载波频率,从而可以把二进制电压序列转换为模拟信号。产生的信号占用了以某一频率为中心的载波频带,可以通过适合于该载波的介质进行传播。大多数通用的调制解调器表示话音频带的数字数据,因而允许这些数据在通常的话音级电话线路上传播。在线路的另一端,另外一个调制解调器对信号进行解调并恢复原来的数据。

第9题:

Which of the following describes the roles of devices in a WAN?()

  • A、A CSU/DSU terminates a digital local loop
  • B、A modem terminates a digital local loop
  • C、A CSU/DSU terminates an analog local loop
  • D、A modem terminates an analog local loop
  • E、A router is commonly consideredaDTEdevice
  • F、A router is commonly considereda DCE device

正确答案:A,D,E

第10题:

Which of the following describes the roles of devices in a WAN? ()

  • A、A CSU/DSU terminates a digital local loop
  • B、A modem terminates a digital local loop
  • C、A CSU/DSU terminates an analog local loop
  • D、A modem terminates an analog local loop
  • E、A router is commonly considered a DTE device
  • F、A router is commonly considered a DCE device

正确答案:A,D,E

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