DSL is available in a number of so-called flavors. Though different in practice or deployment, each of these flavors inevitably falls into one of the following classifications of DSL service:
■ Asymmetrical DSL (ADSL)—Communication in which differing transmission speeds are used for downstream and upstream signals. Typically, downstream speeds tend to be higher than upstream speeds.
■ Symmetrical DSL (SDSL)—Communication in which identical transmission speeds are used for downstream and upstream signals.
Overall, the various implementations of DSL are grouped under a single, quite general term, xDSL. The following sections describe the implementations of DSL that are classified as either ADSL or SDSL.
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