PHYSICAL LAYER AND TRANSMISSION MEDIA
DIGITAL TRANSMISSION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
The two binary, one quaternary (2B1Q) means ____
|
|
the 4-bit patterns encoded as one signal element belonging to a four-level signal
|
|
|
the 2-bit patterns encoded as one signal element belonging to a four-level signal
|
|
|
the 2-bit patterns encoded as one signal element belonging to a two-level signal
|
|
|
the 4-bit patterns encoded as one signal element belonging to a two-level signal
|
Explanation:
Detailed explanation-1: -2B1Q is thus a four-level pulse amplitude modulation (PAM-4) scheme, so called because the information is encoded in the amplitude of the signal pulses.
Detailed explanation-2: -ISDN 2B1Q signal is used on U-interface. 2B1Q is the short form of 2 Binary 1 Quaternary code. As we know ISDN uses standard twisted pair bandwidth which is limited to 4KHz. Hence special techniques are employed to increase the speed of data transmission to conserve the bandwidth available.
There is 1 question to complete.