DSL:
Ø Although there are several other media that can be used to provide broadband access to residential
Ø Although there are several other media that can be used to provide broadband access to residential
and business subscribers, none of them has the facility (or the level of maturity of development) of
the telephone network.
Ø Telephony service is provided to almost every business and residential subscriber in most of the
Ø Telephony service is provided to almost every business and residential subscriber in most of the
world, with several hundred million twisted-pair telephone lines installed globally to date.
Ø Main Purpose of DSL is to provide high speed digital transmission over traditional telephone
Ø Main Purpose of DSL is to provide high speed digital transmission over traditional telephone
service
In simple terms, DSL technologies can be subdivided into two broad classes:
1. Symmetric: Within this class, the data rate transmitted in both directions (downstream and
In simple terms, DSL technologies can be subdivided into two broad classes:
1. Symmetric: Within this class, the data rate transmitted in both directions (downstream and
upstream) is the same. This is a typical requirement of business customers.
2. Asymmetric: In this case, there is asymmetry between the data rates in the downstream and
2. Asymmetric: In this case, there is asymmetry between the data rates in the downstream and
upstream directions, with the downstream data rate typically higher than the upstream (usually
appropriate for applications such as Web browsing).
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