Question

1) ADSL is a digital access technique that requires analog telephone calls to be converted to digital signals using PCM.

True

False

2) Select the correct statement(s) regarding ADSL.

		a. DMT uses OFDM, which minimizes the impact of noise/interference
		b. M’ary QAM techniques are used to adjust bit rates
		c. analog telephone traffic is supported without the need to digitize voice traffic
		d. all are correct statements

3) What is typically a concern for a service provider when attempting to establish an ADSL subscriber link

		a. local loop length between the subscriber and central office (CO)
		b. removal of loading coils from the local loop
		c. the number of splices and their impact on signal reflection within the local loop
		d. all of the above are concerns

4) What is the function(s) associated with the DSLAM (DSL Access Multiplexer)?

		a. aggregates upstream data from users to the network
		b. demultiplexes downstream data to the users
		c. contains the variable rate ADSL modem card for communications to each user
		d. all of the above

Answer 1

1)

The statement ADSL is a digital access technique that requires analog telephone calls to be converted to digital signals using PCM is False.

Explanation: The ADSL (Asymmetric Digital Subscriber Line) does not require analog telephone calls to be converted to digital signals using Pulse Code Modulation.

So, the statement is False.

2)

The correct statements regarding ADSL are as follows:

a) DMT uses OFDM which minimizes the impact of noise/interference.

b) M’ary QAM techniques are used to adjust bit rates.

c) Analog telephone traffic is supported without the need to digitalize voice traffic.

d) All are correct statements.

The correct option is d) All statements are correct.

3)

The concern for a service provider when attempting to establish an ADSL subscriber link is all the above.

The correct option is d) all of the above are concerns.

Explanation: All the given statements are concerns for a service provider when attempting to establish an ADSL subscriber link. If the length of the local loop is between the subscriber and central office (CO), it causes problem to the service provider. Similarly, removal of loading coils from the local loop, the number of splices and their impact on signal reflection within the local loop is also a cause of concern.

4)

The functions associated with the DSLAM (DSL Access Multiplexer) are all of the above.

The correct option is d)

Explanation: The DSL (Digital Subscriber Line) Access Multiplexer aggregates the upstream data from users to the network. It also demultiplexes the data to the users, it contains the variable rate ADSL modem card for communication to each user.