involution
encoding
sampling
quantization
compression
companding
第1题:
A.TE1
B.NT-2
C.TA
D.TE2
E.NT-1
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? ()
第3题:
A. Allows for higher brightness
B. More crosstalk
C. Sustains higher resolutions
D. Supports widescreen resolutions
第4题:
When a router converts analog signals to digital signals, what three steps are always included in the process?()
第5题:
Which three functions are associated with a Cisco Unified CallManager? ()
第6题:
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
第7题:
Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks?()
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
第9题:
Which of the following describes the roles of devices in a WAN?()
第10题:
Which of the following describes the roles of devices in a WAN? ()