discuss how each of these technologies are used in DSL communications, and compa
ID: 3811180 • Letter: D
Question
discuss how each of these technologies are used in DSL communications, and compares all four to provide the major capabilities, shortfalls, and weaknesses of each.
To find out more technical details about DSL, investigate the different modulation techniques that are used to transmit DSL, signal. Although these techniques are quite complex, they are an interesting study in the technological advances necessary to provide high-speed data stream over ordinary copper twisted per wire. Using either the internet or hard copy sources (which by necessity, must be fairly current), look up the four following technologies. All four are being used somewhere on DSL circuit:
-Discrete multitone technology (DMT)
-Carrierless amplitude phase (CAP) MODULATION
- Multiple virtual line (MVL)
- Echo cancellation
Explanation / Answer
Discrete multi-tone technology:
DMT used in the 16-QAM constellation.
Here some channels are used for pilot signals.
DMT devices are said to be rate Adaptive DSL as each
subcarrier may transmitt at a different ratings.
DMT is used as first international telecommunication.
DMT system one need to place low pass filters in to
telephone socket for making voice calls.
Advantages:
It is used in radios and tvs.
more effecient for using band widths.
LArge capacity of divison multiplexing.
capable of transmission with high speeds.
Disadvantages:
Cost high.
Complexity
Noise problem.
CAP:
It is recently implemented in visible light communication
systems.
Advantages
Lower implementation complexity
Disadvantages
speed is low
Multiple Virtual Line (MVL)Multiple virtual Line is used for DSL modulation
in communication which established by Paradyne Company, a form of Digital Subscriber Line (DSL).
expertise that proposals numerous advantages for example, “
AsymmetricDigital Subscriber Line” or (ADSL). MVL topographies client connection is well-matched with
current home cabling, and works over large distances. It practices a subordinate frequency signal and
necessitates a little amount of power. A advantage of the inferior frequency is that the indication does not
impede with telephone package, which is a severe disadvantage for ADSL of such type.
The scope and size of Echo Cancellation in DSL Communication .
It has high voice frequency .
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