Question 1

MPEG-1 and MPEG-2-or simply MPEG-are common examples of ____ compression.

Accepted Answer

MPEG-1 and MPEG-2 use differential encoding, which is a type of lossy compression that reduces data by only storing differences between frames. This is different from frequency encoding, which uses the frequency of data to compress it, and code division, which separates data into different channels to be transmitted. Wavelength encoding is not commonly used for video compression.

Question 2

____,which is an abbreviation for MPEG (Moving Picture Experts Group)Audio Layer-3,is a common form of audio compression.

Accepted Answer

The question specifically mentions that the abbreviation stands for "MPEG Audio Layer-3," which means that the correct answer is C) MP3. A) MPEG is not specific enough since MPEG encompasses a variety of audio and video compression formats, B) GIF is a type of image file format, and D) JPEG is a different type of image file format.

Question 3

____ replaces any repetitions of the same bit or byte that occur in a sequence of data with a single occurrence of the bit/byte and a run count,or simply with a run count.

Accepted Answer

This method is called run-length encoding, in which consecutive identical data elements (such as bits or bytes) are replaced with a count of the number of occurrences and the actual element. This reduces the overall size of the data and is commonly used in image and video compression. The other options (B, C, and D) do not describe this specific compression technique.

Question 4

____________________,and Synchronous Digital Hierarchy (SDH)are two almost identical standards for the high-bandwidth transmission of a wide range of data types over fiber-optic cable.

Accepted Answer

The answer of ____________________,and Synchronous Digital Hierarchy (SDH)are two almost...

Question 5

In general,the device that accepts input from one or more users is called the ____________________.

Accepted Answer

The answer of In general,the device that accepts input from...

Question 6

Synchronous Optical Network (SONET)and ____________________,are powerful standards for multiplexing data streams over a single medium.

Accepted Answer

The answer of Synchronous Optical Network (SONET)and ____________________,are powerful standards...

Question 7

To keep one signal from interfering with another signal,a set of unused frequencies called a(n)____________________ is usually inserted between the two signals,to provide a form of insulation.

Accepted Answer

The answer of To keep one signal from interfering with...

Question 8

The inability of a single fiber-optic line to meet users' needs is called ____________________.

Accepted Answer

The answer of The inability of a single fiber-optic line...

Question 9

____________________,transmits data only from active users and does not transmit empty time slots.

Accepted Answer

The answer of ____________________,transmits data only from active users and...

Question 10

Discrete multitone (DMT)is a multiplexing techinque commonly found in _______ systems.

Accepted Answer

DMT is commonly used in Digital Subscriber Line (DSL) systems. It allows for the transmission of multiple signals over a single line, effectively increasing the bandwidth and improving the overall speed and reliability of the connection. TDM, ATM, and microwave systems do not commonly use DMT for multiplexing.

Question 11

A T-1 telecommunications line uses a multiplexing technique termed ____________________,which provides for the multiplexing of up to 24 separate channels at a total speed of 1.544 Mbps.

Accepted Answer

The answer of A T-1 telecommunications line uses a multiplexing...

Question 12

In Stat TDM,the ____________________,provides information that the receiving multiplexor can use to detect transmission errors within the frame.

Accepted Answer

The answer of In Stat TDM,the ____________________,provides information that the...

Question 13

In ____________________ multiplexing,the frames of the multiplexor's output stream are divided into 24 separate digitized voice/data channels of 64 kbps each.

Accepted Answer

The answer of In ____________________ multiplexing,the frames of the multiplexor's...

Question 14

______ is a technique that is very commonly used to compress video images.

Accepted Answer

The answer of ______ is a technique that is very...

Question 15

In ____________________,the sharing of the medium is accomplished by dividing available transmission time among users.

Accepted Answer

The answer of In ____________________,the sharing of the medium is...

Question 16

Each STS level supports a particular data rate and is supported by a physical specification called a(n)____________________.

Accepted Answer

The answer of Each STS level supports a particular data...

Question 17

A(n)____________________ is an assigned set of frequencies that is used to transmit the user's signal.

Accepted Answer

The answer of A(n)____________________ is an assigned set of frequencies...

Question 18

The technique of transmitting multiple signals over a single medium is ____________________.

Accepted Answer

The answer of The technique of transmitting multiple signals over...

Question 19

A technique that can be used to compress data when a ____ compression is necessary is the Lempel-Ziv technique.

Accepted Answer

The Lempel-Ziv technique is a lossless compression technique, meaning that the compressed data can be uncompressed back to its original form without any loss of information. This makes it a good choice when data integrity is important, such as in data archiving or transmission. Random compression is not a commonly used compression technique, and run-length compression is suitable only for data with lots of consecutive repeated values or runs. Lossy compression is used when the loss of some information can be tolerated, such as in image or audio compression, but it is not appropriate for all types of data.

Question 20

If a compression technique does lose some of the data as a result of the compression process,then it is referred to as a ____ compression technique.

Accepted Answer

Lossy compression techniques discard some of the data in order to achieve greater compression rates. This means that some data will not be recoverable after compression. Lossless compression techniques, on the other hand, do not lose any data during compression and all data is fully recoverable after decompression.

Quiz 5: Making Connections Efficient: Multiplexing and Compression