Symmetric DSL
In this category, the upload and download speeds are the same.
Here are some of the different Symmetric DSL technologies:
-
Symmetric DSL (SDSL) This
technology is suited to environments that need higher upload speeds than those
offered by ADSL. It is provided over a single telephone line and typically
offers rates of around 768 kbps.
-
Integrated Services Digital Network
DSL (IDSL) As the name implies, this technology is similar to ISDN in
that it can use the same terminal adapter. However, it is different in that it
is always on. Also, IDSL is not metered like ISDN. It is a symmetric service
offering rates of around 144 kbps.
-
High Bit Rate DSL (HDSL) This
technology delivers symmetric data rates of around 1.5 Mbps in both directions.
It runs over two-wire pairs.
DSL has a wide range of offerings that users can choose from.
Also, DSL's always-on characteristics and its support of a wide range of
applications make it an attractive technology for many remote users.
DSL does have its drawbacks. Its distance limitation is a
significant issue. DSL services cannot be offered beyond certain distances from
the central office. Also, DSL is not as ubiquitous as other services, like
dialup and ISDN
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