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 th

As a network administrator, you will need to decide on the appropriate network devices to use. Which of the following correctly describes the roles of devices in a WAN? (Choose three)

A. A CSU/DSU terminates a digital local loop.

B. A router is commonly considered a DCE device.

C. A modem terminates an analog local loop.

D. A router is commonly considered a DTE device.

E. A modem terminates a digital local loop.

F. A CSU/DSU terminates an analog local loop.

G. A modem is used to terminate a T1

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

A.digital-to-analogconversion

B.digital-to-digitalconversion

C.analog-to-digitalconversion

D.analog-to-analogconversion

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.

A. Allows for higher brightness

B. More crosstalk

C. Sustains higher resolutions

D. Supports widescreen resolutions

A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.

B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.

C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.

D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.

A、its speed

B、its gain

C、the accuracy of the reference voltage

D、the number of binary bits