Why is it necessary to use a code such as 8?to?14 to encode data bits before recording them on a CD?
What will be an ideal response?
Eight?to?fourteen encoding (or modulation) is not absolutely necessary. However, it provides a cost?effective way of maximizing the number of data bits that can be stored on a CD. A data?recording code should have certain properties if it is to be efficient. For example, you want to store the maximum number of data bits per
code bit. In this case, 14 bits are used to encode 8 data bits. The 8?to?14 bit encoding ensures that there is no DC component in the recorded data sequence (i.e., the average value is 0). This makes the signal processing easier. Moreover, it is a run?length limited code which ensures that there are sufficient transitions to enable
the data clock to be reconstructed from the data. That is, it is a self?clocking code.
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a. right parenthesis b. semicolon c. key word d. comma
The SELECT ___________ wildcard operator matches all the columns in the specified table or tables.
a. * b. ? c. % d. null
Which of the following is not true regarding Internet telephony?
A) For some people, the Internet is a great option for making and receiving both local and international calls for free or a small fee. B) Schools use telephony services for conducting online classes. C) Not only do individuals use telephony services to keep in touch over long distances, but companies use them for videoconferencing between offices. D) VoIP phoning, uses the Internet for phone calls to individuals or for video conferencing.
Multi-Protocol Label Switching (MPLS) allows for faster, cheaper IP routers based on Ethernet technology.
Answer the following statement true (T) or false (F)